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SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY • NUMBER 238

A Systematic Monograph of the Tongue Soles of the Genus Cynoglossus Hamilton-Buchanan (Pisces: Cynoglossidae)

A. G. K. Menon

SMITHSONIAN INSTITUTION PRESS

City of Washington

1977

A B S T R A C T

Menon, A. G. K. A Systematic Monograph of the Tongue Soles of the Genus Cynoglossus Hamilton-Buchanan (Pisces: Cynoglossidae). Smithsonian Contributions to Zoology, number 238, 129 pages, 48 figures, 21 plates, 1977.—The genus Cynoglossus Hamilton-Buchanan is characterized, and its relationship with other cynoglossid genera is discussed. Forty-nine species including a new species, C. lachneri, are recognized.

The origin, distribution, and evolution of the genus are discussed. The genus is of tropical Indo-Pacific and eastern tropical Atlantic in distribution, and the members are mostly marine sandy or muddy shallow-water inhabitants. From the present-day distributional pattern, the genus is considered to have evolved in the Indo-Malayan Archipelago during the Pliocene, and the geological evidences providing explanation for its dispersal to the eastern tropical Atlantic, presumably, during the upper Pliocene have been reviewed.

The genus is composed of an extremely homogeneous assemblage of highly specialized species. Based on a comparative study of the epicranial bony system in different families of flatfishes, it is concluded that in the genus Cynoglossus, it is modified to suit a burrowing habit.

The apparently primitive and specialized characters in the genus are also outlined. The possession of a lateral line on the blind side is considered a primitive character, for it serves no purpose to a fish adapted for a burrowing mode of life. Thus, the absence of a lateral line on the blind side, reduction in the number of caudal fin rays, reduced size of scales, contiguous or closely set eyes with narrow interorbital space, or reduced or minute eyes with wide interorbital space, and loss of posterior slitlike nasal opening are considered specialized characters necessary for a burrowing habit. Based on the morphological features and on zoogeography, the 49 species have been divided into six groups and 17 complexes, and their hypothetical evolutionary relationships are traced.

A key for the separation of species is provided; separate keys for the groups and complexes are not provided, however, since they were mainly based on the pattern of distribution and hence arbitrary in nature. Under each species, the complete synonymy, description, coloration in preservation, size diagnosis and affinities, note on synonymy, information on the type and other material examined, and geographical distribution are given. Lectotypes (wherever necessary) have been selected. Lectotype selection has also been made (wherever necessary), even to a nominal species now considered as a junior synonym to avoid any confusion in the future as to its true identity. The species are illustrated in 40 outline drawings and 21 plates. Eight distributional maps are also provided.

OFFICIAL PUBLICATION DATE is handstamped in a limited number of initial copies and is recorded in the Institution's annual) report, Smithsonian Year. SERIES COVER DESIGN: The coral Montastrea cavernosa (Linnaeus).

Library of Congress Cataloging in Publication Data

Menon, A. G. K.

A systematic monograph of the tongue soles of the genus Cynoglossus Hamilton-Buchanan (Pisces, Cynoglossidae)

(Smithsonian contributions to zoology; no. 238)

Bibliography: p.

1. Cynoglossus. I. Title.   II. Series: Smithsonian Institution. Smithsonian contributions to zoology; no. 238.

QL1.S54   no.238   [QL638.C93]   591′.08s   [597′.5]   76–608109

Contents

Introduction

Acknowledgments

Methods

Definition of Measurements and Counts

Radiography

Clearing and Staining

Family CYNOGLOSSIDAE

The Relationships of the Genera

Key to the Genera of Cynoglossidae

The Lateral-Line System

The Scales

The Epicranial Bony System

The Species Groups and Complexes and Their Hypothetical Evolutionary Relationships

Genus Cynoglossus Hamilton-Buchanan, 1822

Zoogeography and Evolution

Distribution

Geological History of the Red Sea

Dispersal during the Pliocene to Recent

Key to the Species

The canariensis group

The canariensis complex

1. C. canariensis Steindachner

2. C. monodi Chabanaud

3. C. senegalensis (Kaup)

4. C. dubius Day

5. C. borneensis (Bleeker)

The browni complex

6. C. browni Chabanaud

The bilineatus complex

7. C. bilineatus (Lacépède)

The attenuatus complex

8. C. attenuatus Gilchrist

9. C. lachneri, new species

10. C. dispar Day

The kopsi group

The kopsi complex

11. C. kopsi (Bleeker)

12. C. interruptus Günther

13. C. joyneri Günther

The itinus complex

14. C. itinus (Snyder)

The ogilbyi complex

15. C. ogilbyi Norman

16. C. maculipinnis Rendahl

17. C. broadhursti Waite

The ecaudatus complex

18. C. ecaudatus Gilchrist

19. C. cadenati Chabanaud

20. C. dollfusi (Chabanaud)

21. C. sinusarabici (Chabanaud)

The sealarki complex

22. C. sealarki Regan

23. C. microphthalmus (Bonde)

24. C. zanzibarensis Norman

25. C. capensis (Kaup)

The arel group

The arel complex

26. C. arel (Schneider)

27. C. robustus Günther

28. C. lingua Hamilton-Buchanan

The cynoglossus group

The cynoglossus complex

29. C. cynoglossus (Hamilton-Buchanan)

30. C. semifasciatus Day

31. C. macrostomus Norman

The monopus complex

32. C. monopus (Bleeker)

The puncticeps complex

33. C. puncticeps (Richardson)

34. C. durbanensis Regan

35. C. gilchristi Regan

The lida complex

36. C. lida (Bleeker)

The carpenteri group

The carpenteri complex

37. C. carpenteri Alcock

38. C. acutirostrs Norman

39. C. marleyi Regan

40. C. suyeni Fowler

The heterolepis group

The heterolepis complex

41. C. heterolepis Weber

42. C. feldmanni (Bleeker)

43. C. waandersi (Bleeker)

44. C. kapuasensis Fowler

45. C. semilaevis Günther

46. C. abbreviatus (Gray)

47. C. gracilis Günther

48. C. microlepis (Bleeker)

The macrophthalmus complex

49. C. macrophthalmus Norman

Literature Cited

Plates

REQUIREMENTS FOR SMITHSONIAN SERIES PUBLICATION

A Systematic Monograph of the Tongue Soles of the Genus Cynoglossus Hamilton-Buchanan (Pisces: Cynoglossidae)

A. G. K. Menon

____________

A. G. K. Menon, Zoological Survey of India, Southern Regional Station, 69 Santhome High Road, Madras 600028, India.

Introduction

The present work was begun during 1967–1968 at the Division of Fishes of the National Museum of Natural History, Smithsonian Institution, Washington, D.C., where 1 was employed for a year as a Senior Postdoctoral Visiting Research Associate and continued for short periods during October–November 1968 at the British Museum, London, and Museum National d'Histoire Naturelle, Paris, and later at the Zoological Survey of India, Calcutta. The opportunities thus afforded for the examination of material were exceptional, and a much larger number of specimens have passed through my hands than I had at first thought possible. The results of my studies are presented here and I hope, if opportunity is given, to pursue in more detail behavioral, ecological, and life history studies of the cynoglossid flatfishes in a subsequent work.

The genus Cynoglossus Hamilton-Buchanan is tropical Indo-Pacific and eastern tropical Atlantic in distribution, and its members occur along sandy or muddy shores and estuaries. The species are marine or estuarine shallow-water burrowing forms with a few species (C. microlepis (Bleeker), C. heterolepis Weber, and C. kapuasensis Fowler) entering fresh-water streams. Of the 49 species included in the genus, one, Cynoglossus lachneri Menon, is described here as new.

No comprehensive study of the genus Cynoglossus has so far been made, although Norman (1928), Weber and de Beaufort (1929), Punpoka (1964), and Shen (1967, 1969) revised certain Indo-Pacific species and Chabanaud (1949a–d) and Cadenat (1960) revised certain species of the Atlantic. The present work is based on specimens available to earlier workers and on a large number of additional specimens resulting from intensive collecting in recent years, especially in the Indian Ocean during the International Indian Ocean Expedition (1960–1965). It is the first attempt to study the systematics of the genus in the strict sense understood by Myers (1952).

ACKNOWLEDGMENTS.—A large number of individuals and institutions aided me in many ways, especially by the loan of specimens or by making them available for study, by provision of laboratory space or by generously giving information about specimens, notes on specimens in their care, or data from writings unavailable to me, or by helping freely in the translation into English of some of the papers written in French. To each of them I am gratefully indebted, for without their consideration my study could never have been accomplished. To the institutions and their present or former personnel, responsible for the assistance I received, I extend my sincere thanks. A list of those individuals and institutions follows, together with the appropriate abbreviation used throughout the text.

AMNH

American Museum of Natural History, New York, D. E. Rosen

AMS

Australian Museum, Sydney, F. H. Talbot, J. R. Paxton

ANSP

Academy of Natural Sciences of Philadelphia, Philadelphia, J. E. Bolhke, J. C. Tyler

BMNH

British Museum (Natural History), London, E. Trewavas, P. H. Greenwood. N. B. Marshall, P. J. P. Whitehead, A. C. Wheeler

CAS

California Academy of Sciences, San Francisco, W. N. Eschmeyer (George Vanderbilt Foundation collection has now been transferred to the Californian Academy of Sciences and bears the abbreviation “GVF” in parentheses after the abbreviation “CAS”)

CU

Cornell University, Ithaca, New York, E. C. Raney

HUJ

Hebrew University, Jerusalem, the late H. Steinitz

KU

Kyoto University, Japan

MCZ

Museum of Comparative Zoology, Harvard University, Cambridge, M. M. Dick

MNHP

Museum National d’Histoire Naturelle, Paris, M. L. Bauchot

NHV

Naturhistorisches Museum, Vienna, P. Kahsbauer

NMNH

National Museum of Natural History, Smithsonian Institution, Washington, D.C.

RMNH

Rijksmuseum van Natuurlijke Historie, Leiden, M. Boeseman

RU

Rhodes University, Department of Ichthyology, Grahamstown, South Africa, the late J. L. B. Smith, Mrs. M. M. Smith

SOSC

Smithsonian Oceanographic Sorting Center, Washington, D.C., L. W. Knapp

UMMZ

University of Michigan, Museum of Zoology, Ann Arbor, Michigan, R. R. Miller, R. M. Bailey

USNM

Acronym for former United States National Museum collections in NMNH

UZMK

Universitetets Zoologiske Museum, Copenhagen, J. Nielsen

WAM

Western Australian Museum, Perth, R. McKay

ZMA

Zoologisch Museum, Amsterdam, N. Nijssen

ZMB

Zoologische Museum, Berlin, C. Karrer

ZSI

Zoological Survey of India, Calcutta

To the following from the National Museum of Natural History, Smithsonian Institution, Washington, D.C. I am deeply indebted: Dr. Ernest A. Lachner, Curator of Fishes, Division of Fishes, for initiating this project and for constant guidance and encouragement; Drs. Daniel M. Cohen and Bruce B. Collette of the National Marine Fisheries Service Systematics Laboratory for their considerable help and constant encouragement throughout the period of my work in the Division of Fishes. I am most grateful to Drs. E. Trewavas and P. H. Greenwood and through them the Trustees of the British Museum (Natural History) for providing me with the outline drawings of the various species of Cynoglossus prepared by Mr. Hubert Williams under the supervision of the late Dr. P. Chabanaud and for permitting me to use them in the present work. To Mr. P. J. P. Whitehead I am particularly grateful for his kindness in examining on my behalf some of the types in the British Museum, for attending to my several queries in the course of the preparation of this work, and for carefully and critically going through the manuscript and offering valuable suggestions for the improvement of the work. Dr. Boeseman, Curator of Fishes, Rijks Museum van Natuurlijke Historie, Leiden, searched the literature, as well as the collections in Leiden, and helped me to select the appropriate types for species of Cynoglossus described by Bleeker. But for the very kind and generous help that he readily extended to me this work could not have been completed, and it is very gratefully acknowledged here. During the course of my work I have had the benefit of personal discussions with my colleagues in the National Museum of Natural History, especially Drs. R. H. Gibbs, W. R. Taylor, V. Springer, S. Springer, S. H. Weitzman, L. Schultz, W. Aron, L. W. Knapp, and R. Kanazawa. To all of them I am grateful. I have also benefitted from personal discussions with Dr. Carl L. Hubbs on the adaptation of Cynoglossus for a burrowing habit.

The staff of the Central Photo Laboratory of the National Museum of Natural History made the photographs. In the X-ray room of the Division of Fishes (NMNH), the radiographs were made by me, with the help of Mr. E. N. Gramblin.

I should like to record my gratitude to the National Research Council (National Academy of Sciences and Engineering) of the United States, Washington, D.C., for awarding me a Smithsonian Senior Postdoctoral Visiting Research Associateship to enable me to work for a year in the Division of Fishes (NMNH). To the Director of the Zoological Survey of India and the Ministry of Education and Youth Services, Government of India, I am thankful for the grant of study leave to enable my visit to the United States.

My wife, Mrs. Rema G. Menon, who came with me to the United States, helped me a great deal by regularly accompanying me to the laboratory and making counts and measurements.

Methods

DEFINITION OF MEASUREMENTS AND COUNTS.—Measurements were taken on the ocular side of each specimen, using a pair of needlepoint dividers and recording to the nearest one-tenth of a millimeter.

Standard Length: Taken from the tip of the snout to the midlateral posterior margin of the hypurals as indicated externally in the specimen.

Head Length: Taken from the tip of the snout to the posteriormost point reached by the fleshy margin of the opercle.

Diameter of Eye: The vertical diameter taken between the dorsal and ventral rims of the fixed eye.

Snout Length: Taken from the tip of the snout to the anterior rim of the fixed eye.

Interorbital Width: Taken as the nearest distance between the upper rim of each orbit whereever the eyes are separate.

Distance between Snout and Corner of Mouth: Taken in a direct line, being the distance between the tip of the snout and the posterior corner of the cleft of the mouth (measured by keeping the needle of one arm of the divider inside the mouth cleft and the other at the end of the snout).

Distance between Corner of Mouth and Gill Opening: Taken in a direct line, being the distance between the inside corner of the cleft of the mouth and the posteriormost point reached by the fleshy margin of the opercle.

The enumeration of dorsal and anal fin rays in Cynoglossus is most difficult and tedious, and much of the confusion in the taxonomy of Cynoglossus has been cauesd by erroneous counts made on a limited number of specimens of a particular species. The counts of the dorsal and anal fin rays in this work were taken, therefore, from radiographs and some were from cleared and stained specimens. Caudal Rays: All rays in the caudal fin. Since the caudal fin is confluent with both the dorsal and the anal fin some difficulty was experienced in the enumeration of the caudal rays. The caudal rays were therefore counted by placing the fin on the glass stage of a binocular microscope and projecting strong light through the fin. Removing the mucus and skin by means of a needle, a count was taken and then the fin was turned over and the enumeration checked on the blind side.

Vertebrae: In Cynoglossus the last six abdominal vertebrae bear short haemapophyses (Figure 1). The caudal vertebrae are, therefore, those beginning from the first interhaemal spine, which forms the posterior boundary of the abdominal cavity. In radiographs the position of the first interhaemal spine can be readily seen.

RADIOGRAPHY.—Radiographs were prepared by the use of soft X-rays. In this method the fishes were taped closely to the film holder containing high contrast film and exposed at 22 kV. 125 milliamp-seconds, with the X-ray unit focussed about 20 inches from the object.

CLEARING AND STAINING.—A few specimens were cleared and stained for osteological studies and for checking counts made from radiographs. Different methods of clearing and staining specimens have been used (Taylor, 1967). This above method is successful when used on fresh or newly preserved specimens but not on specimens stored in various preservatives for several years (which is most often the case in museum collections). Such specimens may remain opaque because of dark stains in the flesh or they may swell, rupturing the membranes during the clearing process. In order to overcome these difficulties Taylor (1967) evolved a new method, substituting enzyme digestion for alkaline maceration of tissues.

In the improved enzyme method of Taylor, trypsin powder (Fisher Scientific Company’s “Purified Trypsin Powder,” 1:80 MF) is used in sodium borate (borax) buffer solution, which has proved very effective in so far as it supports the most rapid enzyme activity while maintaining a relatively stable and desirable pH over a long period of time. This method has been successfully used in the present work.

Family CYNOGLOSSIDAE

The Heterosomata to which the Cynoglossidae belong can be divided into seven families: Psettodidae, Citharidae, Scopthalmidae, Bothidae, Pleuronectidae, Soleidae (true soles), and Cynoglossidae (tongue soles or solelike fishes with eyes on the left side). The soles (Soleidae and Cynoglosside) are distinguished by having a small mouth, the lower jaw not prominent, the jaws of the blind side strongly curved and toothed, no preopercular margin, the gill membranes fused with free branchiostegal rays, the symmetrical position of the nasal organs, the absence of a postcleithrum in the pectoral arch, and the absence of ribs. In spite of these common characteristics Norman (1934:38) doubted whether the two families are really closely related. Norman cited the example of certain Australian and New-Zealandian genera of the Pleuronectid subfamily Rhombosoleinae (Ammotretis, Colistium, Peltorhamphus) in which some of the species exhibit a strong general resemblance to members of the Soleidae. Especially in Colistium the general form of the body, the shape of the head, particularly its preorbital part, the small eyes, the symmetrical nasal organs, the strongly curved jaws of the blind side, the absence of teeth in those of the ocular side, and the extension of the dorsal fin to the end of the snout are all characteristics found in the members of the Soleidae. The development of membranous folds on the blind side of the rays of the marginal fins, the modification of many of the scales on the blind side of the head to form filamentous processes, and the fringed lower lip are some of the other soleid features developed by the Rhombosoleinae (Norman, 1926:259). Chabanaud (1933, 1934b, 1936, 1937) gave much consideration to the probable polyphylelic origin of the Soleoidea from other flatfishes. Kyle (1921:119–121) believed that the flounders and the soles, and even the divisions within each of these groups, have had separate origins from symmetrical fishes.

Although it seems probable that the origin of the unique asymmetry of flatfishes was a single evolutionary event, it must be admitted that the Heterosomata as a whole are held together by little more than the single character that the two eyes are on one side of the head. Many of the features in which the several families agree now appear to represent convergent adaptations (Hubbs, 1945). The work of Parker (1903) on optic nerves of the Heterosomata is, however, of special significance in this connection. In ordinary bony fishes the optic chiasma is dimorphic in character, the right nerve crossing over the left about as often as the left over the right. In the families Soleidae, Cynoglossidae, and Psettodidae, the chiasma is dimorphic, with the nerve of either the left or the right eye the more dorsal in the optic chiasma. In all other flatfishes, whether dextral or sinistral, the nerve of the migrating eye is dorsal. In the genera of flounders, which are normally dextral (with eyes and color on the right side), the left nerve crosses over the right in all individuals, even in reversed specimens. Similarly in the normally sinistral groups the right nerve is superior even though the individual is variant in having the eyes on the right side. As a result the chiasma is characterized as partly uncrossed in normal individual but doubly crossed in the reversed specimens.

Parker (1903) interpreted the correlation of the type of chiasma with the position of the eye in flounders as adaptive, for when the nerve of the migrating eye is dorsal the chiasma is partly uncrossed rather than doubly crossed as it is when the nerve of the migrating eye is ventral in the chiasma. The chiasma remains dimorphic, however, in both dextral and sinistral soles. This can be explained as due to the relative development of the optic nerves in the two groups. In the flounders, for example, the optic lobes and nerves are larger than in the soles (Evans, 1937:309–310) and are much more conspicuous than the olfactory nerves, occupying a large part of the cavity in which they lie. A complicated arrangement (double crossing) of the nerves may, therefore, involve a mechanical or developmental disadvantage. In soles, on the other hand, the optic nerves are tiny strands lying loose in an extensive space under the large olfactory nerves. In these fishes the olfactory and tactile senses are presumably better developed than the visual. Thus, the double twist of the optic nerves in half the individuals of each species of sole has apparently not been of sufficient selectional significance in the soles, as it has in the flounders, to a fixation of the optic chiasma type in correlation with the usual position of the eye.

The soles, in having several characters in common including the primitive dimorphic type of chiasma, form a natural group, probably split off very early from the other Heterosomata.

The members of the family Cynoglossidae are typically sinistral, with a dimorphic optic chiasma; the jaws are strongly asymmetrical; usually there are two nares on each side of the head, the anterior one tubular, the narial tube of the eyed side always arising in front of the fixed eye; the dorsal and anal fins are confluent with the caudal; the dorsal fin extends onto the head parallel to the axis of the cranium, the first dorsal ray never being inserted behind the vertical from the posterior margin of the eye, this ray remaining above the level of the migratory eye even when the dorsal fin is extended to the tip of the snout; the pectoral fins are lacking in the adult; the pelvic of the eyed side is also lacking (except in rare individual cases where it is situated on the eyed side much above the midventral line, as in the case of Cynoglossus zanzibarensis, Figure 25); the pelvic fin of the blind side is present with four rays always inserted on the midventral line; the anus and the opening of the oviduct are on the blind side; the urinary papilla is long and situated midventrally in front of and attached to the first anal fin ray; the scales are generally ctenoid; the tactile fringes of the lower side of the head are either short or absent and are replaced by epidermal thickness; and there are no epidermal hairs.

FIGURE 1.—Skeleton of C. puncticeps, drawing of a cleared and stained preparation from a 109.0 mm SL specimen (USNM 109799) from the Gulf of Thailand: a, entire skeleton; b, neurocranium; c, epicranium; d, last three abdominal and first two caudal vertebrae; e, epural and hypural bones supporting the ten caudal rays. (AIS = anterior pseudointemeural spine, C = cranium, E = erisma, In = interneural spine, PIS = posterior pseudointerneural spine, RC = rostral cartilage, AR = anal fin rays, CR = caudal fin rays, DR = dorsal fin rays, EP = epural bone, HP = hypural bone, HS = haemal spine, IH = interhaemal spine, NS = neural spine.)

The rostral process of the neurocranium is absent or rudimentary; abdominal vertebrae are usually 9, sometimes 10, or even rarely 12 (C. robustus, C. abbreviates, C. semilaevis); the number of caudal vertebrae is 33 to 66; the neural arch is complete in all the vertebrae, including the first abdominal vertebra; the haemal arches are complete as far forward as the fourth abdominal vertebra; and an anal interhaemal spine is present, attached to the first caudal haemal spine near its extremity.

The digestive and urinary organs do not extend to the caudal region, only the ovaries and the posturethral portion of the urinary bladder occupy the caudal region, and a swim bladder is absent in the adult.

The family Cynoglossidae though comprising over 100 species is a very homogeneous group, which is evident from the fact that it is comprised of only three genera: Symphurus Rafinesque 1810; Cynoglossus Hamilton-Buchanan, 1822; Paraplagusia Bleeker, 1886. The genera Symphurus and Cynoglossus contain most of the species; Paraplagusia consists of only four species, P. bilineatus (Bloch), P. blochi (Bleeker), P. japonica (Temminck and Schlegel), and P. guttata (Macleay). The three genera are so homogeneous that their subdivision into subgenera would appear only artificial. In spite of its evident homogeneity, the family Cynoglossidae is divisible into two subfamilies, the Symphurinae consisting of the genus Symphurus and the Cynoglossinae consisting of the genera Cynoglossus and Paraplagusia. The two subfamilies are perfectly distinguishable from the point of view of their respective morphology and the geographical distribution.

THE RELATIONSHIPS OF THE GENERA

During the course of this revision an examination was also made of the four species of Paraplagusia, as well as a dozen species of Symphurus. Skeletonized preparations of C. puncticeps, C. browni, C. heterolepis, C. robustus, C. lida, Paraplagusia blochi, and a species of Symphurus were studied.

Paraplagusia can be distinguished from Cynoglossus mainly by its possession of a series of fringes on the lips on the ocular side. In all other features, including the osteology, Paraplagusia is very similar to Cynoglossus. In the well-developed and more strongly bent erisma and strongly hooked snout, the tip reaching the rear of the lower eye or even beyond, Paraplagusia is considered as a form more highly specialized than Cynoglossus for a burrowing habit.

Key to the Genera of Cynoglossidae

THE LATERAL-LINE SYSTEM

Except for Symphurus, the other members of the family Cynoglossidae have the lateral-line system well developed.

Head Region: The head region of all the species of the Cynoglossinae has a complex system of canals. In all the species a supraorbital canal is present, which extends from the snout through the area above the eye and is connected to the midlateral line in the posterior part of the head. Above the supraorbital, the cephalodorsal canal commences at the snout, runs posteriorward along the dorsal edge of the head, and is connected to the supraorbital commissure (a dorsal branch of the supraorbital line at the posterior end of the head). These two canals are invariably developed in all the species of Cynoglossinae. From the posterior end of the supraorbital canal the preopercular canal commences, running ventrally toward the preopercular region. In some forms it turns and runs forward to the corner of the mouth, while in others it turns backward and runs to the edge of the opercular region. From the anterior end of the lower jaw to the operculum stretches the mandibuloopercular canal. At its posterior end it turns upward and is connected to the preopercular canal in some (C. bilineatus), whereas in other groups the mandibuloopercular canal gives off a dorsal branch at the posterior corner of the mouth, thereby connecting it to the preopercular canal (C. abbreviatus). In certain other species the mandibuloopercular canal is not connected with the preopercular canal (C. interruptus). On the ocular side there is also a small preorbital canal that starts from the tip of the snout and extends obliquely upward in a straight line to before or below the upper eye.

TABLE 1.—Comparison of subfamilies Symphurinae and Cynoglossinae

On the blind side of the head the lateral-line system is poorly developed or totally absent. Only small traces of the supraorbital, cephalodorsalic, or preopercular canals are found in some forms like the bilineatus and the canariensis complexes, where the lateral-line system of the abdominocaudal region of the blind side is also developed.[1]

Abdominocaudal Region: The Cynoglossinae are the only flatfishes that possess many lateral lines (with the exception of C. sinusarabici, in which there is only a midlateral line). All the other members of both Cynoglossus and Paraplagusia have two or three lateral lines on the ocular side. On the blind side they are generally fewer in number than on the eyed side or are totally absent. In C. dubius Day, C. monodi Chabanaud, C. canariensis Steindachner, C. senegalensis Kaup, and C. borneensis (Bleeker) there is only one lateral line on the blind side, while in C. bilineatus (Lacépède), C. attenuatus Gilchrist, C. lachneri Menon, and C. dispar Day there are two lateral lines on the blind side. In all other members of Cynoglossus the lateral-line system is totally absent on the blind side.

Of the lateral lines on the ocular side the most constant is the midlateral line, which extends from the junction of the supraorbital canal with the supraorbital commissures of the lateral-line system of the head region and runs in the midaxis of the body to the base of the caudal fin. In some species, for example C. bilineatus, this line branches into three at the base of the caudal fin, the middle running along the axis of the caudal fin, and the other branches running parallel to the middle one and extending onto the caudal fin. The next lateral line of more or less constant occurrence on the ocular side in most of the species is the dorsolateral line, which starts from the junction of the cephalodorsal canal with the supraoccipital commissure of the head region and proceeds posteriorly in a zig-zag manner along the dorsal edge of the abdominocaudal region, extending into the dorsal fin a little distance behind the caudal base. The position of the entrance of this line into the dorsal fin varies in the different species and among individuals of the same species. The third and the least constant lateral line of the ocular side is the ventrolateral line, which starts at the posterior end of the base of the pelvic fin and runs posteriorly in a zig-zag manner along the edge of the anal fin and extends onto the anal fin a short distance before the caudal. The place of entrance of this line onto the anal fin also differs in different species and even among individuals of the same species.

In some of the species of the Cynoglossinae the ventrolateral line is well developed, but the presence or absence of this line should not be depended upon for species differentiation, as this character is highly variable. Norman (1926:300) had already hinted at the unreliability of this character for species or generic differentiation in cynoglossid fishes and observed: “The number of lateral lines on the ocular side may perhaps prove eventually to be of doubtful value as a specific character. Jordan and Starks (1960a:240) have noted that in Cynoglossus (Areliscus) interruptus the lower lateral line is broken at irregular intervals and often, especially in smaller examples, it is entirely absent.” I have verified this character in a number of species of Cynoglossus and also in the case of Paraplagusia guttata and find that there is considerable variation in the development of this lateral line among individuals of the same species and even of the same size.

As stated earlier, the midlateral line is the most constant and well developed and is found in all the species of the Cynoglossinae, while the dorsolateral, though present in all the species except C. sinusarabici, is highly variable as regards its nature and extent. It is, however, fully developed in all the species where the ventrolateral is present.

THE SCALES

Along the lateral line in the Cynoglossinae the pored scales usually have the perforating duct simple at its anterior opening, but in C. senegalensis, C. lingua, and C. dubius it is different. In these species the midlateral canal on the ocular side, instead of opening through simple pores on every scale, opens by means of ducts into the adjoining scale above or below. In C. senegalensis single ducts alternate with two ducts, whereas in C. lingua there are two ducts opening on one side, and in C. dubius there are three openings on one side followed by an opening on the opposite side.

The scales are generally ctenoid, the scales of the lateral line having an imbricate arrangement with the lateral-line canal in the middle. In all the species with ctenoid scales the lateral-line scales are provided with spinules above and below the canal.[2] A good deal of variation in the nature of the scales of the two sides, as well as those of the lateral line, occurs among Cynoglossinae. When the scales are ctenoid the spinules are invariably more strongly developed on the ocular than on the blind side. In some species the scales of the ocular side are ctenoid and those of the blind side are cycloid, while in certain others the scales of both sides are cycloid. In some species the scales of the lateral line are cycloid, while all those scales on the ocular side independent of the lateral line are ctenoid (C. lingua, C. senegalensis, C. borneensis, C. browni, C. bilineatus, C. lachneri, C. dispar, C. canariensis).

Regarding the nature of the scales of C. cadenati, Chabanaud (1956) observed that the scales of the upper side are ctenoid (at least in the young), including those of the lateral line (pleurogammiques), and all the pores are simple. On the blind side all the scales are ctenoid (except those of the head, which are cycloid), but the scales toward the fin region are considerably reduced; the marginal spinules are few, lying just above the surface or embedded in the skin. In the case of C. gilchristi Regan the scales and pores are as in C. cadenati, but the scales in the region of the fins on the blind side are more developed and the marginal spinules are prominent. The rest of the species occurring off the Atlantic coast of Africa, namely, C. senegalensis Kaup, C. guinensis, C. canariensis ( = C. lagoensis), C. monodi, and C. browni, form a distinct group characterized by the ctenoid condition (at least in the young) of the upper scales except for the scales on the lateral lines, which are cycloid; by the diverticulated opening of the lateral-line pores; and by the cycloid condition of the scales of the blind side. Thus, in the nature of its scales, C. cadenati differs entirely from all the other species of Cynoglossus occurring off the Atlantic coast of Africa, and it should undoubtedly be placed in the group containing C. gilchristi, which is also characterized by ctenoid scales (at least in the young) on both the blind as well as the eyed side. Chabanaud (1956) further concluded that in the genera Cynoglossus and Paraplagusia the pleuragrammique formula (number of lateral lines on the two sides of the body) should be subordinated to the pholidologique character (nature of scales).

Modifications of Scale with Age: Modifications in the nature of the scales occur with age (size) in certain species. For instance, in big specimens of C. arel, which have mainly ctenoid scales including those of the lateral line, a number of cycloid scales are found in the lateral line toward the posterior end, especially near the base of the caudal fin. The scales that remain most consistently ctenoid are those of the rows close to the dorsal and the anal fins.

Dealing with modifications of scales among Cynoglossus, Chabanaud (1965) divided Cynoglossus into two groups according to the nature of scales of the upper side, namely, those with the entire upper side with ctenoid scales and those with the lateral-line scales cycloid and the rest of the scales ctenoid. However, in the case of big specimens of C. arel, which are characterized by ctenoid scales on the upper side including those of the lateral line, a number of cycloid scales occur in the lateral line. Modification in the nature of the scales on the up per side is correlated with age, beginning from the posterior end of the fish and at the base of the caudal fin. The most conservative scales are in the rows closest to the dorsal and anal fins, the rest gradually becoming cycloid with age. It is, therefore, not generally possible to decide to which of the two groups a specimen belongs unless juveniles or immature specimens are examined.

FIGURE 2.—Diagramatic representation of lateral lines in Cynoglossus to show the variations in the perforating ducts in the different species: a, C. senegalensis where the scales on the lateral line are cycloid with single duct opening outside, alternately followed by two ducts on either side; b, C. lingua where the scales on the lateral line are cycloid with two ducts opening on either side in the adjoining scales; c, C. dubius where the scales on the lateral line as well as the adjoining scales are cycloid with three ducts opening on one side followed by a duct opening on the opposite side; d, Cynoglossus species where all the scales on the ocular side are ctenoid with a single pore opening on every lateral line scale. (D = dorsal side, V = ventral side, C = caudal side, PO = pore opening, DI = diverticulum, CA = lateral line canal.)

THE EPICRANIAL BONY SYSTEM

In the generalized genus Psettodes, the first spine of the dorsal fin lies on the nape and well behind the eyes, but in all other flatfishes the fin has extended forward at least to above the eye and in some even to the extremity of the snout. This forward extension of the dorsal in the Pleuronectoidea is along the ridge of the supraoccipital and hence along the bar formed by the union of the prefrontal and frontal on the blind side above the upper eye, i.e., along the pseudomesial bar instead of along the morphological median line. Above the eye the fin is, therefore, not infrequently bent over a little toward the blind side. In some genera, such as Pleuronichthys, one or more rays of the anterior part of the fin are virtually on the blind side of the head.

The anterior extension of the dorsal fin onto the head in flatfishes appears to have been achieved either by (1) the anterior interneural spines themselves moving forward along the upper surface of the cranium from a position in the region of the supraoccipital to one on the frontal of the blind sides as in Pleuronectes or (2) as in the case of the Soleoidea, the first few interneural spines being inclinded forward, so that the first of these may actually occupy a horizontal position, thus carrying the rays of the dorsal fin to the required place (Norman, 1934:15). The interneural spines, inclined forward onto the cranium, are supported by a hard bony system called the epicranial bony system (Ochiai, 1966:55).

In the case of the Soleoidea those anterior interneural spines that are inclined forward are supported by a special curved spinelike bone lying nearly parallel to the cranium. This rod-shaped bone is considered as the modified first interneural spine and is called the erisma[3] by Norman (1934: 15). Its base lies at a point between the ventral side of the anterior end of the first neural spine and the cranium, and its anterior end reaches to the snout. In the Soleidae (except Heteromycteris Kaup) and the Symphurinae the erisma is comparatively short and arched, its dorsal side near the anterior end bearing two pterygiophores but no interneural spines. In the specialized Heteromycteris the erisma is long and thick, the anterior end being strongly bent ventrally, supporting 15 interneural spines dorsally and two long pterygiophores anteriorly (Ochiai, 1963:13).

In the Cynoglossinae the erisma is quite long and sickle shaped, supporting 10 interneural spines and two pterygiophores dorsally. The anterior pterygiophore is specially well developed to form an axe-shaped rostral cartilage (Wu, 1932:21) devoid of any fin rays. This rostral cartilage in most of the species is strong and flexible with 12 strong radially arranged muscles on both sides. The erisma in the Cynoglossinae is supported by one or two spinous or sword-shaped bones, the pseudointerneural spines. The anterior pseudointerneural spine is sword shaped in most species, its base fixed lightly on the frontal bone and the broader anterior portion extending forward onto the ventral side of the erisma. In Symphurus the anterior pseudointerneural spine[4] is slender and spinous and its base is attached to the supraoccipital bone.

The posterior interneural spine, which is spinous, is present in most members of the Cynoglossinae and the Symphurinae. In the Cynoglossinae it lies between the cranial bones and the anterior pseudointerneural spine, while in the Symphurinae its base is attached to the supraoccipital and it projects forward parallel to the anterointerneural spine.

The Adaptive Significance of the Erisma: In Pleuronectes a thin membranous bone is developed on the middle axis of the cranium for supporting the interneural spines that have moved onto the head (Ochiai, 1963:56, fig. 14). This structure strengthens the fin rays but prevents further invasion of the dorsal fin through the middle axis to the anterior edge of the eye or snout region. In most species of pleuronectids the dorsal fin, therefore, does not move onto the head portion beyond the eye; if it does, it reaches to the area near the nostril on the blind side. Those fin rays that reach the snout region of the blind side are supported by interneural spines on the prefrontal bone. In the Soleoidea the erisma is separated from the cranium and lies parallel to the middle axis of the head, thereby enabling the dorsal fin to move easily along the dorsal edge of the head as far as the snout without being deflected to the blind side.

In the Soleidae the epicranial bony system is developed primarily to support the dorsal fin rays on the head. In the process of specialization to a bottom living habit and for fast swimming by means of undulating movements, the vertical fins have extended onto the head. The modification of the pelvic fin, which is attached to the anal fin by a membrane, is also a means of achieving efficient undulating movements of the body. In the case of Heteromycteris, the erisma extends anteriorly and is bent ventrally to carry on its dorsal side the interneural spines and the dorsal rays. In addition to carrying those dorsal rays that have extended forward to the head, the erisma has the secondary function of strengthening the snout. In this case, however, there is no rostral cartilage in the anterior portion of the erisma. In the case of Cynoglossus, the dorsal fin does not extend far forward and the first pterygiophore does not bear any fin ray but is modified into a rostral cartilage to give support to the snout, thus enabling these fishes to plough the sandy or muddy bottom to secure their food, as well as to hide themselves by burying wholly or partly in the sand. The poorly developed sensory system, or lack of one, on the blind side of the head and body of Cynoglossus, in contrast to its development in the Soleidae, points to two distinct types of habit in these two groups of fishes. While members of the Soleidae are mostly feeders on the surface of the bottom by means of their well-developed tactile organs on the blind side of the head, the Cynoglossidae are adapted primarily to ploughing the sand in search of prey and to feeding on organisms living below the surface. In Symphurus, although the erisma is not so well developed as in Cynoglossus or Paraplagusia, it is also strengthened by the two pseudointerneural spines, suggesting a similar habit of burrowing into the bottom for feeding.

THE SPECIES GROUPS AND COMPLEXES AND THEIR HYPOTHETICAL EVOLUTIONARY RELATIONSHIPS

Taxonomically the genus Cynoglossus has several lines of evolution representing six groups and 17 complexes.

The western periphery of the geographical range of Cynoglossus, namely the tropical Atlantic coast of Africa, is occupied by the most unspecialized species closest to the ancestral stock. Toward the Malay Archipelago are the more specialized and rapidly evolving species complexes. The primitive species or their immediate ancestors apparently evolved in this center and were replaced subsequently by the more specialized species, such as those of the cynoglossus, the carpenteri, and the heterolepis groups.

The canariensis group, comprising the canariensis, the browni, the bilineatus, and the attenuatus complexes, is considered primitive and nearest to the ancestral stock. These species are peripheral in distribution (Figures 4, 5) and are mostly large adult fishes reaching to about 400 mm. They exhibit characters considered primitive in the process of specialization toward a burrowing mode of life. They generally have one or two lateral lines on the blind side, 12 rays in the caudal fin, relatively big eyes separated by a wide interorbital space, two nostrils on the eyed side, large scales, and a rounded snout. The possession of a lateral line on the blind side is considered a primitive character for cynoglossid fishes feeding on organisms living below the surface by digging or burrowing into sand or mud. No useful purpose is likely to be served by having lateral lines on the blind side and, therefore, they are totally absent in the specialized forms. The reduction in the number of caudal fin rays, reduced size of scales, reduced size of eyes, scaly covering of eyes, and loss of posterior slitlike nasal opening, leaving only the anterior tubular nostril, are all specializations for a burrowing mode of life.

The canariensis complex is the most primitive complex of species within the canariensu group and is characterized by a single lateral line on the blind side. Its members are found at the extreme western extremity of the generic range (Figure 4). The bilineatus complex is the next evolved group. It extends to the northern (Japan) and the southern (Australia) periphery (Figure 5) and is characterized by two lateral lines on the blind side.[5] The attenuatus complex of species, occupying the east African coast, the Seychelles, and the seas of India and Pakistan (Figure 5), retains the primitive two lateral lines on the blind side but shows a reduction in the number of rays in the caudal fin; otherwise, there are no structural changes from the bilineatus complex. Cynoglossus browni is placed in a separate complex because of the absence of any lateral line on the blind side. Morphologically, and in its distribution, C. browni is closely related to the canariensis complex and is probably evolved from a canariensis-like ancestor through the loss of the lateral line on the blind side.

The kopsi group, with small adult size members attaining about 200 mm, is distinguished by the lack of any lateral line on the blind side, large eyes, either contiguous or separated by a very narrow interorbital space, and a short obtusely pointed snout, with the angle of the mouth situated distinctly nearer to tip of snout than to branchial opening.

The contiguous or subcontiguous nature of the eyes is considered a very useful specialization in fishes with a burrowing habit. In Cynoglossus two lines of specialization of the eyes have taken place. In the first case, where the eyes are of large size, they have become contiguous or have come close to one another, generally with the adipose membrane of the eyelid becoming thick and scaly, holding the eyes more or less close together as a compact structure, which gives sufficient protection to them while ploughing or burrowing into the sand. In the other case, which is more commonly met with in the highly specialized species (heterolepis group), the eyes have become considerably reduced in size, the interorbital width being the same or even more than the diameter of the eye.

Included in the kopsi group are the kopsi, itinus. ogilbyi, ecaudatus, and sealarki complexes. Of these, the kopsi complex is considered the most primitive, i.e., nearest to the canariensis group, the body scales being somewhat larger than in the members of any other complex (interlinear scale count: kopsi complex 7–12, ecaudatus complex 10–12, ogilbyi complex 8 or 11–14 and sealarki complex 10–17). Reduction in the size of the body scales accompanies specialization. The large imbricate scales on the body are a disadvantage for the burrowing mode of life of a fish. The itinus, ogilbyi, ecaudatus, and sealarki complexes comprise closely related species and have evolved into distinct complexes of species mainly through gradual reduction of the size of the body scales from the original kopsi stock that had spread to different ecological nitches along the coasts of Japan, Australia, and Africa. Today the kopsi complex is restricted to an area from the Indo-Australian Archipelago to southern Japan and westward through India and Pakistan to Cargados Garajos, Seychelles, and the Persian Gulf (Figure 7). The kopsi complex is characterized by two nostrils on the ocular side, large body scales, ctenoid on both sides, and 10 rays in the caudal fin.

In the African waters, two major lines of evolution of the early kopsi stock seem to have taken place, one along the South African coast leading to the sealarki complex of species and the other along the north-east and West coasts of Africa including the Red Sea and the Mediterranean to the ecaudatus complex (Figure 7). The ecaudatus complex is characterized by two nostrils on the ocular side, comparatively small body scales with 10–12 interlinear rows, ctenoid on both sides, and usually with 8 rays in the caudal fin, while the members of the sealarki complex have only the anterior tubular nostril, the posterior slitlike nostril being absent, smaller body scales with 10–17 interlinear rows, ctenoid on the ocular, and partially cycloid on the blind side, and 10 rays in the caudal fin.

The stock that had spread from the Indo-Malayan Archipelago southward to the Australian waters differentiated into the ogilbyi complex of species characterized by two nostrils on the ocular side, smaller body scales with 8 or 11–14 interlinear rows, ctenoid on the ocular side, and usually cycloid on the blind side, and 8 rays in the caudal fin. The itinus complex seems to have evolved in the Japanese waters through the loss of the posterior slitlike nasal opening, in all the other morphological features itinus remaining similar to the kopsi complex.

The arel group, with relatively large adult size attaining about 400 mm, is a step forward in the evolutionary history of the genus. The members of this group are characterized by fairly large eyes but separated by a narrow interorbital space, much elongated body, and long obtusely pointed snout with the angle of the mouth situated nearer to the branchial opening than to tip of the snout. Its range covers the whole of the Malay Archipelago extending north to Japan and westward to India, Pakistan, and the Persian Gulf (Figure 6). This group has certain similarities to the canariensis and bilineatus complexes, especially in the large adult size of its members and the nature and position of the eyes and large scales; therefore, it is considered to have evolved as an early offshoot from the main stock, which gave rise to the canariensis group.

FIGURE 3.—Dendogram showing the hypothetical evolutionary relationship of the species complexes of Cynoglossus.

The cynoglossus group, consisting of fishes of small adult size attaining only about 175 mm, is characterized by relatively small eyes (pedunculate in monopus complex) separated by a narrow interorbital space, a moderately elongated snout, but with the angle of the mouth situated nearer to the tip of the snout than to the branchial opening (except lida complex), and relatively small scales on the body, the interlinear scale rows being 7–21. Its range covers the Malay Archipelago, northwest Australia, the seas of India and Pakistan, and the East Coast of Africa (Figure 8). In evolutionary relationships, this group is considered closer to the arel group, especially in the nature and position of the eyes, the lateral-line system, and the caudal fin ray count, than to the kopsi group. Hence it has been considered as a recent offshoot from the stock that gave rise to the arel group.

The carpenteri group, attaining relatively large adult size (about 300 mm), is most probably derived from an early cynoglossus-like ancestor through the elongation of the body, the modified snout with the shifting of the angle of the mouth to a point distinctly nearer to the branchial opening than to the tip of the snout, a reduction in the size of the scales with an increased interlinear scale rows of 15–22, and the addition of a third lower lateral line.

The heterolepis group is closely related to the carpenteri group, differing mainly in having small or minute eyes with a wide interorbital space. They cluster mostly around the Malay Archipelago (Figure 10) and are most probably evolved as an early offshoot of the stock that gave rise to the carpenteri group.

The species complexes have been erected on Zoogeographical basis, and since characters such as the loss of posterior slitlike nares occurred independently in widely separated areas and are mainly adaptive, no separate key for their identification is given. However, a key for the identification of the species has been provided.

Genus Cynoglossus Hamilton-Buchanan, 1822

Cynoglossus Hamilton-Buchanan, 1822:32, 365 [type-species: Cynoglossus lingua Hamilton-Buchanan, monotypy.]

Cantoria Kaup, 1858:106 [type-species: Plagusia potous (not potous of Cuvier) Cantor = Cantoria penanganensis kaup, monotypy.]

Arelia Kaup, 1858: 107 [type-species: Pleuronectes arel Schneider = Arelia schneider Kaup, tautonymy.]

Icania Kaup, 1858:109 [type species: Plagusia cynoglossus Cantor = Icania cynoglossus Kaup, monotypy.]

Trulla Kaup, 1858:109 [type-species: Trulla cantori Kaup = Plagusia trulla Cantor, tautonymy.]

Areliscus Jordan and Snyder, 1900:380 [type-species: Cynoglossus joyneri Günther, monotypy.]

Cynoglossoides Bonde, 1922:23 [type-species: Cynoglossus attenuatus Gilchrist, 1905, monotypy.]

Cynoglossoides [not Bonde, 1922] Smith, 1949:165 [type-species: Cynoglossus ecaudatus Gilchrist, 1908, original designation; preoccupied by Cynoglossoides Bonde 1922.]

Dollfusichthys Chabanaud, 1931:304 [type-species: Dolljusichthys sinusarabici Chabanaud, monotypy.]

Dexiourius Chabanaud,1947b:443[type-species:Cynoglossus semilaevis Günther 1873b, monotypy.]

Body lanceolate, eyes on left side, center of migratory eye usually placed in advance of center of fixed eye and usually anterior to its anterior border, pectorals absent; only pelvic fin of blind side present, with four rays, all inserted ventrally in front of anal and connected to it by a membranous extension of its last ray. Dorsal, anal, and caudal are confluent. The abdominocaudal region of the ocular side always bears a mediolateral line that, except in Cynoglossus sinusarabici, is accompanied by a marginodorsal line and in some species by a third sensory line, the marginoventral. The dorsolateral line generally runs in a zigzag or interrupted manner posteriorward and enters the dorsal fin, the position of the entrance varying from species to species and even among individuals. The ventrolateral line, when present, originates from the posterior end of the base of the pelvic fin and also runs in a zigzag or interrupted manner along the base of the anal fin, entering the anal fin some distance before the base of the caudal. On the blind side the lateral lines are generally fewer in number than on the ocular side; one or two or often absent. On the ocular side of the head a complex system of lines is present, which in its essentials is invariable.

The scales are generally ctenoid on the ocular side, ctenoid or cycloid on the blind side; the scales on the mediolateral line are imbricate and traversed by the lateral-line canal, the scales having spinules above and below the pores of the lateral line. On the ocular side the anterior nostril is tubular, arising in front of the fixed eye a short distance from the sublachrymal sulcus; the posterior nostril when present is generally a simple opening in the interorbital space when the eyes are separate, or somewhat in front of the middle of the eyes when the eyes are contiguous; on the blind side the anterior nostril is generally tubular, arising above the anterior half of the upper lip, the posterior opening or slit generally lying at a level slightly higher and above the posterior half of the upper lip, the internarial space varying from two-thirds to three-fourths of the distance between the posterior nostril and the corner of the mouth opening. The jaws are strongly asymmetrical; only the jaws of the blind side are armed with teeth; the latter are needle shaped, arranged on the dentary and the premaxillary, forming a wide, short band with a meniscoidal outline. The mouth is rather narrow, the snout hooked and overhanging the mouth opening. The lips are not fringed (cf. Paraplagusia). The gill opening is narrow; the gill membranes are united, free from isthmus. The urinary papilla is on the eyed side and wholly joined to the first anal ray. The ovarian duct opens into the posterior half of the anus situated on the blind side.

The length of the neurocranium is less than its height; the cerebral cavity is longer than the rhinophthalmic part of the skull; the vault of the cavity is complete; the sacculi are not prominent.

Vertebral diapophyses are absent. Abdominal vertebrae 9 or 10, rarely 11 or 12, caudal vertebrae 33 to 66. The closure of the abdominal haemal arches is accomplished by a transverse bridge, beyond which the two half-arches are prolonged freely, on each side of the kidney.

The cleithrum is subangularly arched, the cuticular crest of the coracoid segment forming an acutely angled apophysis at its base.

The epicranial bony system is well developed; the erisma is angularly arched and prolonged anteriorly, supporting a strong preoral cartilaginous plate.

Species of Cynoglossus were unknown to 18th-century naturalists. The first species of Cynoglossus known to science was Schneider’s Pleuronectes arel from Tranquebar, on the east coast of India. Two years later Lacépède (1802) described a species from China and the East Indies under the name Achirus bilineatus.

Hamilton-Buchanan’s genus Cynoglossus was the seventh in his order Apodes, consisting of “fishes having the dorsal spine of bone and wanting ventral fins.” He characterized the genus as comprising fishes “with both eyes on one side of the head and with a flat body, formed for swimming on the side opposite to the eye.” Under his genus Cynoglossus, Hamilton-Buchanan included only one species, C. lingua. In the same work Hamilton-Buchanan described another species, Achirus cynoglossus, under his fourth order Thoracini, comprised of fishes having the dorsal spine of bone and ventral fin placed immediately under the pectorals. He recognized, however, the close relationship of this species to C. lingua.

In 1949, Chabanaud (1949a–d) published a series of four papers on the Cynoglossidae of the Atlantic coast of Africa. In the first of these he gave the principal characteristics of the various genera of the Cynoglossidae (1949a:60–64) and described C. monodi from Dahomey and Sierra Leone (1949a: 65–66), giving a key to all the species, subspecies, and morpha of Cynoglossus from that region. Regarding the nature of the scales in C. monodi he remarked (1949a:66) that on the upper side all the scales on the lateral line are cycloid; the pores of the sensory canal are more or less distinctly separated; the scales on the body are cycloid for about the three quarters of the body length in the type except for those that are placed near the dorsal fin as well as in the ventral fin; those scales are all ctenoid on the last quarter of the body in the type. The scales on the blind side are cycloid. He observed that by comparison with what exists among the varied species of the Indo-Pacific, it is reasonable to think that in some smaller (younger) individuals all the scales on the upper side of the body (nonpleurogrammiques) are ctenoid, while in larger individuals these scales can become uniformly cycloid. In the second paper in the series, Chabanaud (1949b) redescribed all the species of Cynoglossus and in the third and fourth (1949c,d) gave a key and made certain remarks on the various eastern Atlantic species. In the same year (1949e) Chabanaud also described C. cleopatrides from the Suez Canal.

In 1950 Chabanaud redescribed C. cleopatrides and in 1951 published four important papers. In the first of the series (1951a) he briefly discussed the nature of the lateral line in C. senegalensis, C. lagoensis, and C. kopsi. In the next (1951b) he redescribed C. brachycephalus and described a form from the Seychelles similar to C. brachycephalus, but with three lateral lines in the abdominocaudal region of the ocular side, which he tentatively considered as a distinct species and provisionally named it C. seychellensis. A form of C. brachycephalus from the Gulf of Suez, with a single lateral line on the abdominocaudal region of the ocular side (for which he had earlier erected a new genus and species, Dollfusichthys sinusarabici), he considered as yet another morphological variety of C. brachycephalus. He further observed drat the morphological variety of a species is a matter of geographical localization of its representatives. In Indo-Malayan and (in a general way) Indian Ocean species the upper lateral line is unbroken. To the west of the Indian Peninsula, i.e., in the Persian Gulf and the Red Sea but excluding the Gulf of Suez, the upper lateral line is shortened not only anteriorly, but also from its posterior end to the point that in certain individuals, particularly those that live in the Red Sea, the line in question occupies no more than a minimum extent of the middle part of the abdominocaudal region. Finally, the same lateral line disappears entirely in the 22 specimens examined from the Suez Canal. The Seychelles specimen with three lateral lines could be an exceptional case because not far from its place of capture the individuals found in the Carajos belong to the two lateral-line types.

NOTE ON SYNONYMY.—As indicated by Norman (1926), I find that the number and nature of nostrils and the number of lateral lines on the ocular side are of little value in generic differentiation. Cantoria is characterized by two nostrils on the ocular side, both located above the upper lip; Arelia by the presence of two nostrils, one tubular on the upper lip before the eyes and the other between the eyes; Trulla by the presence of only one nostril in front of the lower eye; and Icania with no conspicuous nostril at all. Günther (1862) did not consider any of Kaup’s genera distinct and grouped them all under Cynoglossus.

As an adaptation to a burrowing habit the tubular narial opening is an advantage. It is, therefore, invariably present in all such species, whereas the posterior slitlike narial opening between the eyes is sometimes absent. The posterior nares are absent in the more highly evolved species like the capensis complex of species (in Africa), C. itinus (in Japan), and C. macrophthalmus (in Australia); they are hidden by a thick fleshy covering as a protection against fine sand particles; they are minute and invisible, unless examined through a lens, in most of the other species.

Jordan and Starks (1906a) restricted the name Cynoglossus to species with two lateral lines on ocular side and placed those with three lateral lines in Areliscus. Bonde (1922) considered forms with two lateral lines on each side as Cynoglossoides and commented (1925) on the utility of splitting the original genus Cynoglossus into separate genera and subgenera but observed that “if carried too far it may lead to complications and an undue number of monotypic genera.” Further he observed that “the lateral line which is the main character used in splitting the genera is not always a constant one.” Smith (1949), obviously unaware of the generic name Cynoglossoides proposed by Bonde, included forms with two lateral lines on ocular side and none on the blind side under his genus Cynoglossoides, with C. ecaudatus as the type-species. Chabanaud (1931) proposed Dollfusichthys for a form characterized by a single lateral line on the ocular side. The lateral lines, as has been pointed out, are highly variable in number and extant, and this cannot be considered as reliable character for generic or even specific differentiation.

Chabanaud (1947c) proposed the genus Dexiourius for certain individuals of C. semilaevis from China with a vestigial pelvic fin persisting on the eyed side.

ZOOGEOGRAPHY AND EVOLUTION

DISTRIBUTION.—The geographical area of Cynoglossus comprises the eastern tropical Atlantic, the eastern Mediterranean, the whole of the Indian Ocean, including the Malay area in the east, the Persian Gulf, the Gulf of Oman and the Red Sea, the whole of the East Coast of Africa as far south as the Cape of Good Hope in the west, the west pacific from south China to south Japan, and the whole of the periphery of the Australian continent. The eastern and northern limit of Cynoglossus is Tokyo at 35°40′N (C. interruptus); the southern limit is the mouth of the Murray River, South Australia, at 34°10′S (C. broadhursti). The western limit is marked by the Canary Islands, about 30°N (C. canariensis) in the Northern Hemisphere, and Angola, about 10°S (C. canariensis) in the Southern Hemisphere.

In spite of the much smaller spread into northern and southern latitudes as compared to that of the Soleidae,[6] the distribution of Cynoglossus follows a similar pattern of the Soleidae.

The most important conclusions that can be drawn from an analysis of the distributional data given in Table 2 are:

TABLE 2.—General distribution of the species of Cynoglossus (x = widespread distribution within area)

FIGURE 4.—Distribution of canariensis-browni complex of species.

FIGURE 5.—Distribution of bilineatus-attenuatus complex of species.

FIGURE 6.—Distribution of arel group of species.

FIGURE 7.—Distribution of kopsi, itinus, ogilbyi, and ecaudatus complex of species.

FIGURE 8.—Distribution of puncticeps complex of species.

1. There is a decreasing number of species of Cynoglossus as one progresses westward from the Indo-Malayan region to the West Coast of Africa through the coasts of India and Pakistan, the East Coast of Africa, and the Red Sea.

2. The most primitive and generalized species are found off the West Coast of Africa.

3. The most specialized forms are found in the Indo-Malayan area.

Thus, the Malayan area, as the world’s greatest archipelago containing large areas with a depth of less than 200 (Ekman, 1953), fufills all the conditions laid down by Matthew (1915) for a center of dispersal of Cynoglossus. It has the largest number of species, as well as the most progressive forms, with the generalized species occurring at the periphery of the range of the genus.

In considering the time of evolution of any group of animals of which there is no fossil record, the geological history of the areas it inhabits is essential. At the beginning of the Tertiary, the Tethys Sea covered large areas that today are dry lands, and from the West Indies to the Pacific Ocean a rich community of tropical animals populated the littoral zone of this area (Ekman, 1953:66). The extinction of the tropical Tethys fauna in the Mediterranean, according to Ekman, was mainly due to the lowering of temperature in the late Tertiary period when the northern elements of the temperate fauna, which emigrated into the Mediterranean, formed the ancestral stock of the Mediterranean fauna of today. However, in the Mediterranean, which is usually defined as a warm-temperate sea, it is the tropical forms that dominate in the present-day fauna. These are mainly related to the fauna of the warmer parts of the Atlantic Ocean. There is, however, a northern boreal element as well in the present-day fauna but diese are Pleistocene immigrants (Kosswig, 1955). If it were not for the Tertiary immigrants, the well-adapted species from the north probably would have occupied all the ecological niches in the Mediterranean and thereby would have prevented colonization by the later immigrants from the warmer parts of the Atlantic. That there has not been total occupation of all ecological niches in the Mediterranean is evidenced by records of successful immigration of the Indo-Pacific forms into it (Steinitz, 1927, 1929, Ben-Tuvia, 1966). These species coming from the Red Sea, the warmest and saltiest sea (Marshall, 1952a,b), have passed through the Suez Canal with its changing and extreme ecological conditions and have established themselves in the eastern part of the Mediterranean. The great plasticity exhibited by these species does not lend any support to the view that their ancestors died out in the Mediterranean at the end of the Tertiary due to the climatic changes of that epoch; indeed, they had several million years at their disposal for adaptation to the cooling of the climate that occurred then.

FIGURE 9.—Distribution of carpenteri complex of species.

The occurrence today of Symphurus, the most primitive genus of the Cynoglossidae, in both the east and west Atlantic as well as off both the coasts of America, suggests that it had most probably evolved earlier than the Miocene when communication existed between the Indo-Pacific and the Atlantic through the Mediterranean and between the American, Atlantic, and the Pacific through Central America.

The present-day distribution of the Soleidae, including the broad soles, the Achiridae, extends throughout the whole of the tropical Indian Ocean, the Pacific, and the Adantic. Soleid fishes are known from the Eocene beds of Egypt (Woodward, 1910), Java (Vorstman, 1927), and the Gulf Coast (Frizzel and Dante, 1965), but no fossil records of any cynoglossids are so far known. Among the cynoglossids, Symphurus has a much wider distribution, coinciding with that of the Soleidae (including the broad soles). From this distributional pattern it is reasonable to conclude that Symphurus had evolved much earlier than Cynoglossus, probably in the Eocene, and at about the same time as the Soleidae, later spreading westward as far as the Pacific coast of America. Cynoglossus (including Paraplagusia), the most specialized genus of flatfishes, seems to have a more recent origin, probably not earlier than Pliocene. The occurrence today of closely related species of Cynoglossus—the canariensis and the ecaudatus groups—off tropical west African coasts on the one hand and in the Indo-Pacific on the other is very significant in this connection (Figures 4, 7).

FIGURE 10.—Distribution of heterolepis group of species.

FIGURE 11.—Distribution of Cynoglossidae: Symphurus, Cynoglossus, and Paraplagusia.

GEOLOGICAL HISTORY OF THE RED SEA.—Geologically the Red Sea is relatively young, the main physical features being completed only during the Pliocene. The Red Sea came into being as a result of faulting of Eocene strata and the filling of this great rift with water from the Tethys Sea to the north of it. During Miocene times this sea extended southward as far as southern Egypt. This no doubt was an extension of the Proto-Mediterranean for its fossils are mainly of Mediterranean affinities (Davies, 1934). The upper Miocene movements caused the elevation of the region and a period of continental conditions prevailed over the gulf of Suez during late upper Miocene and lower Pliocene (Said, 1962). A connection between the Red Sea and the Indian Ocean seems to have been established during the latter half of the middle Pliocene, when a phase of subsidence took place and the Red Sea proper was flooded by the Indian Ocean through a break at the Bab-el-Mandeb Strait (Fox, 1926). Marine Pliocene deposits are noted as far south as latitude 28°30′N, to the south of which there is definite proof of marine invasion by Indo-Pacific marine Pliocene fauna (Said, 1962: 194). To the north of this latitude and caused by the same tectonic movements, considerable sinking of the Gulf of Suez also took place during the middle Pliocene, for the deposits of diese periods, especially along the Sinai Gulf coastal strip, are in places more than 1500 m in thickness (Said, 1962). In the north and east the upper Pliocene movements must have been strong enough to produce flooding of the Isthmus of Suez and the free mixing of water from the Mediterranean and the Gulf of Suez, but it is uncertain when the Gulf of Suez became cut off from the Mediterranean (Marshall, 1952a).

This would seem to be the generally accepted geological history of the Red Sea, but Sewell (1948) considered the possibility of the emergence of the shallow sill at the southern end of the Red Sea during the Glacial periods and the reduction of the Red Sea to an inland lake (Marshall, 1952a). It is probable that the Gulf of Suez was also cut off from the Mediterranean during the glacial periods. An excellent recent account of the geological history of the Red Sea has been given by Botros (1971).

DISPERSAL DURING THE PLIOCENE TO RECENT.—The earliest stock of Cynoglossus, namely the canariensis group, seems to have spread from the Malay area westward through the seas of India and Pakistan to the Arabian coast and thence through the Red Sea to the Mediterranean, presumably during the upper Pliocene. It must then have spread northward through the Chinese Sea to south Japan and through Indonesian waters southward to Australia.

The kopsi group (consisting of the itinus, ogilbyi, ecaudatus, and sealarki complexes), which is the nearest to the canariensis group, also seems to have spread to the Mediterranean along the same route at a later period, but not later than early Pleistocene. Thus, C. cadenati is today found off tropical west Africa, while the closely related species C. dollfusi and C. sinusarabici occur in the Suez Canal, the eastern Mediterranean, and the Red Sea (Figure 7).

The freshwater discharge of the Nile into the Mediterranean must have formed a barrier to the westward spread of many of the Indo-Pacific fishes (Ekman, 1953:88). Cynoglossus, however, are bottom-living euryhaline fishes, and the freshwater discharge of the Nile and also the shallow strait that probably existed at the present-day Isthmus of Suez connecting the Red sea and the Mediterranean (Tortonese, 1964:103) would not have formed a barrier for their migration to the Mediterranean and their establishment there.

It is not clear whether the present-day Mediterranean fishes have persisted there throughout the Quaternary period. As stated above, it seems more probable that the Tethys fauna died out as a result of the lowering of temperature or changes in salinity in the Mediterranean during the glacial periods of the Pleistocene. The Isthmus of Suez must have been exposed, leaving probably only brackish water lakes along its course. This separation of the Mediterranean from the Red Sea ended in 1869 when, with the opening of the Suez Canal, fresh opportunities were afforded to the Indo-Pacific fishes to enter into the Mediterranean. The record of C. sinusarabici from Israel (Ben-Tuvia, 1966) indicates its recent spread there.

Key to the Species

The canariensis group

Four species complexes, namely the canariensis complex, the browni complex, the bilineatus complex, and the attenuates complex, are here included in what may be called the canariensis group, canariensis being closest to the evolutionary stem of the group and probably of the entire genus. This group (with the exception of C. browni) is characterized by one or two lateral lines on the blind side, two or three lateral lines on the ocular side, 12 rays in the caudal fin (except the attenuatus complex), large eyes separated by a wide interorbital space, two nostrils on the eyed side, large scales, and rounded snout.

The members of the canariensis group are the most morphologically generalized species of the genus, the presence of lateral lines on the blind side being considered a primitive character in Cynoglossus. The reduction in the number of caudal fin rays, the small or reduced size of the eyes, the type of scales, and the atrophy or reduction in the number of nostrils are all considered specializations for a burrowing habit.

The canariensis complex

Included in this complex are C. canariensis, C. monodi, C. senegalensis, C. dubius, and C. borneensis. These are large species characterized by 12 rays in the caudal fin and one lateral line on the blind side. Their center of distribution is in west Africa, the western extremity of the range of the genus; apparently they are a very old group and probably the earliest stock to be given off from the evolutionary center of the genus, namely the Malay Archipelago.

1. Cynoglossus canariensis Steindachner

FIGURE 12; PLATE 1

Cynoglossus canariensis Steindachner, 1882:13, pl. 2: fig. 2 [type-locality: Bane d’Argain, Canary Is.].—Chabanaud and Monod, 1926:284.—Fowler, 1936:526, fig. 249.—Chabanaud, 1949b:203.—Cadenat, 1960:1383.

Cynoglossus lagoensis Regan, 1915:129 [type-locality: Lagos].—Fowler. 1936:526.—Chabanaud, 1949b:207.

DESCRIPTION.—Based on 10 specimens 173.0–367.0 mm SL, including the lectotype and paralectotypes of C. lagoensis.

Depths of body 21.39–26.45 (M = 24.60) and length of head 20.23–24.19 (M = 21.51) percent of standard length. Diameter of eye 6.29–8.57 (M = 7.13), interorbital width 4.29–8.0 (M = 6.13) percent of length of head. Two nostrils on ocular side, anterior nostril of eyed side tubular, on upper lip in front of lower eye, posterior nostril simple, in anterior half of interorbital space. Snout pointed, 30.67–34.29 (M = 32.55) percent of length of head, rostral hook short and hardly reaching to vertical through front border of upper eye. Maxillary extending to well beyond fixed eye; angle of mouth extending to beyond vertical from posterior border of fixed eye, nearer to tip of snout than to branchial opening; snout to angle of mouth 46.58–52.86 (M = 49.33), angle of mouth to branchial opening 50.67–57.33 (M = 55.08) percent of length of head.

Scales: On eyed side (except on lateral lines) ctenoid in anterior part, cycloid posteriorly; scales on blind side and on lateral lines of eyed side cycloid.

Lateral-Line System: 3 lateral lines on ocular side, midlateral line with 76–88 scales. 10–13 (M = 12) scales between upper and middle lateral lines. One lateral line on blind side.

Interlinear scale rows

10

11

12

13

Frequencies

1

0

4

1

Fins: Dorsal with 125 and anal with 99 rays, caudal 12 in 3 specimens (radiographs).

Vertebrae: 57–59, comprising 9 abdominal and 48–50 caudal elements in 3 specimens (radiographs).

Coloration: Upper side uniformly brownish, lower rather whitish in preserved specimens.

Size: Largest specimen examined, 546.0 (510 + 36) mm, is from Angola collected by the Discovery. BMNH 1935.5.11.228.

DISTRIBUTION.—West Africa: Canary Islands, Senegal to Angola.

FIGURE 12.—C. canariensis: a, outline drawing of lateral view of ocular side of a specimen (BMNH 19355.11.228) from Angola; b, details of anal region on blind side of lectotype (BMNH 1914.11.2.72). (A = anus, OV = ovarian orifice.)

DIAGNOSIS AND AFFINITIES.—Cynoglossus canariensis is closely related to C. monodi and C. senegalensis. It is, however, distinguishable by its relatively larger scales, the interlinear scale count being 11–13 (12–14 in C. monodi and 17–18 in C. senegalensis), and the nature of body scales, ctenoid on ocular side, cycloid on blind side (C. canariensis and C. senegalensis), and mostly cycloid on both sides (C. monodi).

NOTE ON SYNONYMY.—Steindachner’s (1882:13) description of C. canariensis was based on a single specimen, 280 mm in TL, from the Canary Islands. His fish had three lateral lines on the ocular side and one on the blind side. Because of the excellence of his description and illustration there has been little confusion in the identity of his species. However, Regan (1915:129) described C. lagoensis on the basis of three specimens, 390–512 mm TL from Lagos and Angola, and related it to “C. canariensis Steindachner in which the cleft of the mouth ends below the middle of the eye, the head is smaller, the scales are more numerous.” I have examined the Iectotype and the paralectotypes of C. lagoensis in London and found them referable to C. canariensis. Comparison of several specimens from west Africa has shown that the differences noted by Regan are merely intraspecific variation.

TYPE SPECIMENS.—Holotype of C. canariensis, NHV 47–773, 252 mm SL, 259 mm TL; Canary Islands, Africa (pers. comm., Dr. Paul Kahsbauer).

BMNH 1914.11.2.72, 356 mm SL, lectotype of C. lagoensis, designated by Chabanaud (1949b:207), Lagos, Cadman. Another specimen, BMNH 1914.-11.2.71, 365 mm SL, paralectotype of C. lagoensis, designated by Chabanaud, Lagos, Cadman, and a further specimen, BMNH 1935.5.11.288, paralectotype of C. lagoensis, designated by Chabanaud, Angola, Discovery.

OTHER MATERIAL EXAMINED.—1 specimen, BMNH 1935.5.11.229, Angola, coll. Discovery. 2, BMNH 1962.6.18.135.36, Atlantide Sta 86, coll. N. Nielson. 1, BMNH 1962.6.18.137, Atlantide, 102.5°34′N, 4°50′E, coll. N. Nielson. 1, ZMA 108.008, W Africa, Cape Bianco, coll. Vermeulen, 1906. 5, USNM 188435, off Lagos, Nigeria, coll. A. Longhurst. 1, CU, Ghana Teshis, Atlantic Drive, coll. Amegah, 26.1.1962. 1, CU, Ghana, Amegah, 14.8.1961.

2. Cynoglossus monodi Chabanaud

FIGURE 13; PLATE 1

Cynoglossus monodi Chabanaud, 1949a:65 [type-locality: Dahomey and Sierra Leone, west Africa].—Cadenat, 1960:1383 [Lagos, Nigeria; Chorkor, Accra, Ghana].

DESCRIPTION.—Based on 7 specimens, 281.0–327.0 mm SL, including the holotype of C. monodi.

Depth of body 20.00–23.85 (M = 21.46) and length of head 19.65–22.0 (M = 20.16) percent of standard length. Diameter of eye 6.25–7.08 (M = 6.50), interorbital width rather broad, 5.65–8.00 (M = 6.88) percent of length of head. Anterior nostril of eyed side tubular, on upper lip in front of lower eye, posterior nostril simple, in anterior half of interorbital space. Snout narrowly rounded, 38.71–44.25 (M = 42.32) percent of length of head, rostral hook rather short, stopping just in front of vertical through front border of fixed eye. Maxillary extending to well beyond fixed eye; angle of mouth extending to right behind vertical from posterior margin of fixed eye, nearer to branchial opening than to tip of snout; snout to angle of mouth 52.42–58.04 (55.46), angle of mouth to branchial opening 38.52–46.77 (M = 44.05) percent of length of head.

Scales: Cycloid on both sides, except on last quarter of body on upper side, where they are ctenoid.

Lateral-Line System: Two lateral lines on ocular side, midlateral line with 85–96 scales, 12–14 scales between middle and upper lateral lines. One lateral line on blind side.

Inter linear scale rows

12

13

14

Frequencies

1

2

3

Fins: Dorsal with 125–131 (M = 127) rays, anal with 99–105 (M = 101) rays, caudal 12 in 3 specimens radiographs).

Vertebrae: 57–60 comprising 9 abdominal and 48–51 caudal elements in 3 specimens (radiographs).

Coloration: Upper side is light brown and the lower rather whitish in preserved specimens.

Size: Largest specimen examined, USNM 193912. 352.0 (327 + 25) mm, is from Nigeria, off Lagos.

DISTRIBUTION.—West Africa: Dahomey, Sierra Lione, Nigeria, Accra, Ghana, and Lagos.

DIAGNOSIS AND AFFINITIES.—Cynoglossus monodi is closely related to both C. canariensis and C. senegalensis, but it can be readily distinguished by the cycloid nature of the scales on its ocular side (ctenoid in C. canariensis and C. senegalensis).

FIGURE 13.—Outline drawing of C. monodi, paratype (BMNH 1949.4.30.4) from Great Popo, west Africa.

TYPE SPECIMENS.—Chabanaud (1949a:65) described C. monodi on the basis of 3 specimens, 241–349 mm in TL, from Dahomey and Sierra Leone. I have succeeded in locating only 2 specimens, the holotype, MNHP 49–18, 312 mm SL, and one paratype, BMNH 1949.4.30.4, 237 mm SL. The third specimen from Sierra Leone is likely to be in the Paris Museum but is not traceable at the moment.

OTHER MATERIAL EXAMINED.—3 specimens, USNM 188434, Nigeria off Lagos, coll. A. Longhurst, 1962. 2, USNM 193910–12, Liberia, off St. Paul River, 1½–7 fms, coll. G. C. Miller, 29 Dec 1952.

3. Cynoglossus senegalensis (Kaup)

FIGURE 14; PLATE 2

Arelia senegalensis Kaup, 1858:108 [type-locality: west Africa].

Plagusia (Arelia) senegalensis.—Dumeril, 1858:264 [Senegal].

Cynoglossus senegalensis.—Günther, 1862:502.—Capello, 1872:86, [Bissau, west Africa].—Rochebrune, 1882:116 [Goree, Dakar, Guet N’Dar, Barbarie].—Büttikofer, 1890:480.—Steindachner, 1894:50 [Messurad River mouth, Liberia].—Pellegrin, 1913:153 [Lagune de Porto-Novo, Dahomey]; 1914:78 [Lagune de Porto-Novo, Dahomey].—Fowler, 1936:527,1261.

Cynoglossus (Arelia) senegalensis.—Steindachner, 1870:977 [St. Louis].

Cynoglossus senegalensis senegalensis Chabanaud. 1949b:204 [morpha typica, two lateral lines on ocular side, one on blind side]; 1949d:518.

Cynoglossus senegalensis simulator Chabanaud, 1949b:205 [Dakar].

Plagusia bilineala [not Lacépède].—Duméril, 1858:246 [Isle of Prince, Portuguese West Africa].

Cynoglossus goreensis Steindachner, 1882:12, pl. 1: fig. 2 [Goree].—Osorio, 1894:134 [Benguella, Angola]; 1898:199 [Angola].—Pellegrin, 1905:35 [Guet N’ Dara, Dakar]; 1913:152 [Konakry, Guinea]; 1914:79 [Guet N’ Dar, Dakar; Konakry].—Regan, 1915:129 [Lagos].—Fowler, 1918a:249 [Cape Palmas, Liberia], 268 [Gaboon].—Chabanaud and Monod, 1926:284 [Cape Blanco].—Fowler, 1936:526 [Liberia and Gaboon].—Chabanaud, 1949d:519.

Cynoglossus guineensis Osorio, 1909:104, pl. 1: fig. 2 [type-locality: Bolama, Portuguese Guinea].—Chabanaud, 1949b:202 [Dahomey and Togo]; 1949d:519.—Cadenat, 1960:1383 [Lagos, Nigeria, Jui, and region of Freetown, Sierra Leone].

DESCRIPTION.—Based on 11 specimens, 117.5 mm–375.0 mm SL, including the holotype of C. senegalensis simulator.

Depth of body 20.38–24.79 (23.13), length of head 18.63–22.13 (M = 20.26) percent of standard length. Diameter of eye 6.08–9.68 (8.14), interorbital width 5.98–9.86 (M = 7.50) percent of length of head. Two nostrils on ocular side, anterior tubular on upper lip, the tube not extending to fixed eye, the posterior in the anterior half of interorbital space. Snout prominent, broadly rounded, 24.62–39.32 (M = 33.84) percent of length of head, rostral hook rather short, extending only to front of anterior nostril. Maxillary extending beyond fixed eye; angle of mouth extending to just beyond vertical from posterior border of fixed eye, slightly nearer to tip of snout than to branchial opening; snout to angle of mouth 47.30–54.29 (M = 50.04), angle of mouth to branchial opening 47.14–56.45 (52.07) percent of head.

Scales: Ctenoid on ocular side, except those on lateral lines; scales of blind side and of lateral lines on ocular side cycloid.

Lateral-Line System: Two or three lateral lines on ocular side, midlateral line with 89–108 scales; 17–18 scales between upper and middle lateral lines. One lateral line on blind side. The midlateral line on ocular side instead of opening through simple pores on every scale opens by means of simple ducts into the adjoining scale, generally with a single duct on one side followed by two ducts on the other side (Figure 2).

FIGURE 14.—Outline drawing of C. senegalensis (BMNH 1896.5.5.51) from Igowe River, Lambarene.

Interlinear scale rows

17

18

Frequencies

6

8

Fins: Dorsal with 119–125 (M = 121) rays, anal with 93–99 (M = 96) rays, caudal 12 in 7 specimens (radiographs).

Vertebrae: 56–58 comprising 9 abdominal and 47–49 caudal elements in 7 specimens (radiographs).

Coloration: Upper side is dark brown in alcohol and blackish or greenish in formalin, the blind side is white in preserved specimens.

Size: The largest specimen examined, 397 (375 + 22) mm, holotype of Cynoglossus senegalensis simulator Chabanaud, is from west Africa.

DISTRIBUTION.—West Africa: Liberia to Lagos.

DIAGNOSIS AND AFFINITIES.—Cynoglossus senegalensis is closely allied to C. canariensis and C. monodi. These three form a fairly well-defined complex of species, but C. senegalensis and C. canariensis have ctenoid scales on ocular side (cycloid scales in C. monodi). Cynoglossus senegalensis is, however, easily distinguished by its smaller body scales, the interlinear scale count being 16–18 cf 10–14 in C. canariensis, 12–14 in C. monodi.

NOTE ON SYNONYMY.—Kaup’s (1858:101) description of Arelia senegalensis was meager and was based on a single specimen, 555 mm in TL from west Africa. A very salient feature in his description was the presence of two lateral lines on the ocular side. Steindachner had the same species before him when he described C. goreensis on the basis of a specimen, 600 mm in TL, from Goree and characterized it by having three lateral lines on the ocular side. Chabanaud (1949b:203) synonymized it with C. senegalensis and I concur with him since an additional lateral line is of no significance. Osorio (1909:104) gave the name C. guineensis to a specimen from Guinea on the ground that it differed from C. senegalensis by its slightly smaller scales and somewhat deeper body. Comparison of numerous specimens from west Africa has convinced me that these differences are only intraspecific variation and I have, therefore, synonymized C. guineensis with C. senegalensis. It may be pointed out, however, that Osorio’s description is defective in that he mentions only 16 scales between the upper and middle lateral lines, whereas in the illustration 18 rows are indicated.

Chabanaud (1949b:205) described C. senegalensis morpha simulator based on a single specimen, 410 mm in TL from Dakar, and distinguished it from C. s. senegalensis morpha typica by its possession of an additional lateral line on the ocular side. Since the development of an additional lateral line is not considered of any significance in the differentiation of species in Cynoglossus, 1 have considered the two species conspecific. I have examined the holotype of C. s. simulator and found it to be identical to specimens of C. senegalensis.

TYPE SPECIMENS.—The type specimen of C. senegalensis is not available in Berlin (pers. comm., C. Karrer) and is most probably not extant. MHNP 49.22, 375 mm SL, holotype of C. senegalensis simulator, Nigeria, off Lagos, coll. A. Longhurst. NHV 3–776, 550 mm SL, 590 mm TL, holotype of C. goreensis, Goree, Dakar, Senegal (Dr. Paul Kähsbauer examined the type on my behalf).

OTHER MATERIAL EXAMINED.—3 specimens, USNM 188433. Nigeria, off Lagos, coll. A. Longhurst. 1, USNM 193653, Mesurado R. beach, Liberia, coll. G. C. Miller. 1, USNM 193881, Bushrod Is., Liberia, coll. G. C. Miller. 1, UMMZ 202912, off St. Paul R., Liberia (4½–7 fms). 1, USNM 247424, Nigeria, off Lagos. 2, CU, Volta R., Ghana, coll. Bane and Richards, 23.7.1951. 3, CU, Labadi, Atlantic drainage, Ghana, coll. Amegah, 26.1.62. S, CU, Teshi, Ghana, coll. Amegah, 26.1.62. 3, BMNH 1862.1.22.22–24, W Africa, coll. A. Murray. 1, BMNH 1891.4.2.14, Lagos, coll. Maloney. 3, BMNH 1896.5.5.51–53, Lambarene, Ogowe R., coll. Kingsley. 1, BMNH 1900.6.28.311, St. Louis, Senegal, coll. Delhez. 3, BMNH 1901.12.28.112.114, Gambia, coll. Budgett. 1, BMNH 1902.11.10.262, Lagama, S Nigeria, coll. Ansorge. 1, BMNH 1911.6.1.131, Gunja, Angolia, coll. Ansorge. 1, BMNH 1913.7.12.2, Ogowe, coll. Schneider. 1, BMNH 1914.11.2.66, Lagos, coll. Cadman. 1, BMNH 1930.3.24.44, Accra, Gold Coast, coll. Irvine. 1, BMNH 1937.4.9.33, Nigeria, coll. Welman. I, BMNH 1939.7.12.39, Volta R., Gold Coast, coll. Irvine. 2, BMNH 1948.8.12.1–2, Lagos, Lagoon, coll. Trewavas. 1, BMNH 1949.4.30.3, W Africa, coll. Chabanaud. 1, BMNH 1953.7.10.41, Nigeria, coll. Trewavas.

4. Cynoglossus dubius Day

FIGURE 15; PLATE 2

Cynoglossus dubius Day. 1873:525 [type-locality: Gwadur]; 1877:435, pl. 95: fig. 2: 1889:456.—Norman, 1928:200.—Saramma, 1963:75 [Kerala coast].—Pradhan, 1964:458 [Bombay coast].

DESCRIPTION.—Based on 8 specimens, 257.0–450.0 SL.

Depth of body 27.24–30.86 (M = 29.23), length of head 23.46–26.07 (M = 24.79) percent of standard length. Diameter of eye 5.97–7.61 (M = 6.65), interorbital width pronounced, 7.46–9.72 (M = 8.42) percent of length of head. Anterior nostril of eyed side tubular, on upper lip in front of fixed eye, the posterior in the anterior half of interorbital space, or in the middle of it. Snout obtusely pointed, 40.30–45.78 (M = 42.62) percent of length of head, rostral hook rather short, extending to just beyond mandibular symphysis. Maxillary extending to beyond posterior border of fixed eye; angle of mouth extending below vertical from posterior border of fixed eye, or a little beyond, nearer to branchial opening than to tip of snout; snout to angle of mouth 52.63–54.35 (M = 53.74), angle of mouth to branchial opening 45.37–50.53 (M = 47.33) percent of length of head.

FIGURE 15.—Outline drawing of C. dubius (BMNH 1911.12.6.16) from Karachi, Pakistan.

Scales: Cycloid on both sides, except along both dorsal and anal fins toward the posterior side of the ocular side, where the scales are weakly ctenoid.

Lateral-Line System: Two lateral lines on eyed side, midlateral line with 98–104 scales, 17–21 scales between two lateral lines. One lateral line on blind side. The midlateral line on ocular side instead of opening through simple pores on every scale opens by means of ducts into the adjoining scale, generally one duct on one side followed by three ducts on the other side (Figure 2).

Intetlinear scale rows

17

18

19

20

21

Frequencies

3

3

11

0

1

Fins: Dorsal with 111–114 (M = 113) rays, anal with 88–91 (90) rays, caudal 12 in 5 specimens (radiographs).

Vertebrae: 52–53, comprising 9 abdominal and 43–44 caudal elements in 5 specimens (radiographs).

Coloration: Upper side uniformly brown, lower whitish in preserved specimens.

Size: The largest specimen examined, 447.0 (450 + 27) mm, is from the Arabian Sea, trawled by Anton Bruun (lat. 23° 16′N, long. 67°56′E).

DISTRIBUTION.—West coast of India.

DIAGNOSIS AND AFFINITIES.—Cynoglossus dubius is closely allied to C. borneensis. It is distinguishable, however, by having cycloid scales on the ocular side and by the greater number of anal fin rays (88–91 cf. 82–87) and vertebrae (52–53 cf. 48–51).

NOTE ON SYNONYMY.—Originally described on the basis of a single specimen by Day, C. dubius was well diagnosed and there has been no confusion with regard to its identity.

TYPE SPECIMEN.—Day (1873:525) described C. dubius from a single specimen, 500 mm in TL, from Gwadur and illustrated the specimen in his Fishes of India (pl. 59: fig. 2). Norman (1928:200) described the species from four specimens, 220–460 mm in TL, and stated that it included an example “believed to be the type of the species.” Day’s type specimen was lost during the Varuna floods in Banaras in 1943, where the collections of the Zoological Survey of India were removed for safety during World War II.

OTHER MATERIAL EXAMINED.—1 specimen, ZSI (unregistered), Kumta, Udipi, Mysore State, coll. Umarkutty and B. Sinha, 26.12.66. 1. USNM 139718, backwaters of Travancore. coll. Schultz. 2, SOSC Ref 23, Neendakara, Kerala, lat. ca. 08°56′N. long. ca. 76°30′E, coll. Anton Bruun, Oct. 1966. 4, SOSC Ref 23, Arabian Sea. lat. 23°16′N. long. 67°56′E, coll. Anton Bruun, 19.11.63. 1, BMNH 1906.10.24.18, Travancore, ex. Trivandrum Museum. 1, BMNH 1911.12.6.16, Kurrachee (Karachi), coll. Townsend. 1, BMNH 1912.7.20.28. Travancore, ex. Trivandrum Museum. 1, BMNH 1938.8.9.13, Calicut, 5 India, coll. Devanean.

5. Cynoglossus borneensis (Bleeker)

FIGURE 16; PLATE 3

Plagusia bomeensis Bleeker, 1858a:6 [type-locality: Borneo].

Arelia bornensis.—Bleeker, 1860b:9.

Cynoglossus bomeensis.—Bleeker, 1875:34, pl. 245: fig. 5.—Günther, 1862:498 [Singkawang].—Fowler, 1905:518. [Borneo].—Seale, 1910:288.—Weber and de Beaufort, 1929:205.

Plagusia trulla Cantor, 1850:1213 [type-locality: Penang Sea, Malay Peninsula].

Cynoglossus trulla.—Günther, 1862:505.—Duncker, 1904:169.

Trulla cantori Kaup, 1858:109 [based on Cantor’s P. trulla].

Cynoglossus sinicus Wu, 1932:146.

DESCRIPTION.—Based on 4 specimens, 88.0–300.0 mm SL.

Depth of body 23.04–25.50 (M = 24.28), length of head 21.77–25.00 (M = 23.30) percent of standard length. Diameter of eye 5.93–9.09 (M = 7.80), interorbital width 4.35–6.82 (M = 6.17) percent of length of head. Anterior nostril of eyed side tubular, on upper lip in front of lower eye, posterior nostril simple, in anterior half of interorbital space. Snout rounded, 29.55–37.29 (M = 34.36) percent of length of head, rostral hook short, extending hardly to front of anterior nostril. Maxillary extending to beyond fixed eye; angle of mouth extending right up to or just beyond vertical from posterior margin of fixed eye, nearer to tip of snout than to branchial opening; snout to angle of mouth 43.18–50.85 (M = 46.86), angle of mouth to branchial opening 51.49–54.55 (M = 53.44) percent of length of head.

FIGURE 16.—C. borneensis: a, outline drawing of lateral view of ocular side of specimen (BMNH 1884.2.26.73) from China; b, details of anal region on blind side of specimen (BMNH 1931.4.23.53) from Borneo, female. (A = anus, OV = ovarian orifice.)

Scales: Ctenoid on ocular side except those on lateral lines, scales on blind side and those on lateral lines of eyed side cycloid.

Lateral-Line System: Two lateral lines on eyed side, midlateral line with 94–102 scales, 18–20 scales between the two lateral lines. One lateral line on blind side.

Interlinear scale rows

18

19

20

Frequencies

1

2

1

Fins: Dorsal with 108–113 (M = 111) rays, anal with 82–87 (M = 84) rays, caudal 12 in 8 specimens (radiographs).

Vertebrae: 48–51, comprising 9 abdominal and 49–52 caudal elements in 8 specimens (radiographs).

Coloration: Upper side with three approximately parallel longitudinal stripes, the middle one on median lateral line and a diffuse dark patch on opercular region, lower side whitish in preserved specimens.

Size: Largest specimen examined, 450.0 mm SL, is from China.

DISTRIBUTION.—Borneo, Malaya, Gulf of Thailand, and South China Sea.

DIAGNOSIS AND AFFINITIES.—Cynoglossus borneensis is closely related to C. dubius but can be readily separated by the ctenoid scales on the ocular side (cycloid in C. dubius) and the more elongate body (depth of body 23.04–25.50 cf. 27.24–30.86 percent of SL).

NOTE ON SYNONYMY.—Bleeker (1858:6) described P. borneensis on the basis of a single specimen, 218 mm TL from Sinkawang, Borneo, and characterized it as having two lateral lines on the ocular side and a single one on the blind side. In the Atlas (1875:34, pl. 245:fig. 5) he redescribed the species and illustrated it in color. Because of his excellent description and illustration there has not been any confusion in the identity of C. borneensis. Cantor (1850:1213) considered a specimen, 300 mm TL, from the sea of Penang, Malay Peninsula, to represent a new species, Plagusia trulla, and characterized it as having only one nostril in front of the lower eye, the depth of the body four and one-half to four and two-thirds in TL, and 12 rays in the caudal fin. Cantor, however, did not mention the number of lateral lines on the body. I have examined the type of P. trulla in the British Museum and though the nostrils are not discernible in the stuffed specimen smeared over with varnish, an interlinear scale row of 18 or 19 scales and the 12 rays in the caudal fin are discernible, distinctive enough to refer the specimen to C. borneensis. Cynoglossus sinicus described from Chinese waters is the same as the present species. Three specimens, one from Hong Kong and the other two from China labeled as C. sinicus in the British Museum, agree so well in body depth and scales with C. borneensis that I have no reservations in synonymizing them.

TYPE SPECIMENS.—Among the Bleeker collection specimens in Leiden is a specimen, 195 mm SL, 212 mm TL, from Sinkawang, Borneo, catalogued as RMNH 6792 (pers. coram., Dr. M. Boeseman); it is evidently the holotype of C. borneensis.

There are two stuffed specimens, 212 and 262 mm SL, of P. trulla cataloged as BMNH 1860.3.19.431 from Penang, coll. Dr. Cantor.

OTHER MATERIAL EXAMINED.—MALAY: 1 specimen, BMNH 1860.S.19.431a, Penang. Malay, coll. Dr. Cantor. 2, BMNH 1933.7.31.28–29, Singapore Mkt., ex. Raffles Museum. BORNEO: 1, Kapuas R.. Borneo, coll. Hardenberg. THAILAND: 1. BMNH 1862.11.1225, Thailand, coll. Jamrach. 1, USNM 103321, Bandon Blight. Gulf of Thailand, coll. H. M. Smith, 29.9.1923. 1, CAS (CVF) 2582, Shakon Prov. ¾ mi off shore. Gulf of Thailand, lat. 13°26′15″N, long. 100°10′E, coll. Naga Expd. 1959–1961. 7, ANSP 87208, Thailand, coll. R. M. de Schauensee, 1936. CHINA: 1. BMNH 1839.353.39, Hong Kong. coll. Herklots. 2, BMNH.1884.2.26.73, China.

The browni complex

Cynoglossus browni is placed in a separate complex, which is close to the canariensis complex of species but differs in the absence of a lateral line on the blind side. Morphologically and in its distribution C. browni is related to C. senegalensis.

6. Cynoglossus browni Chabanaud

PLATE 3

Cynoglossus senegalensis morpha browni Chabanaud, 1949b:204 [type-locality: coast of Sierra Leone, West Africa].

Cynoglossus browni.—Cadenat, 1960:1382, pl. 2: fig. B; pl. 3: figs. B, C.—Nijssen, 1966:87 [28 miles northwest of Ijmuiden, off the coast of Netherlands].

DESCRIPTION.—Based on 12 specimens, 219.5–370.0 mm SL, including the holotype of C. browni.

Depth of body 24.22–28.53 (M = 25.93), length of head 17.67–20.90 (19.02) percent of standard length. Diameter of eye 3.74–6.60 (M = 4.81), interorbital width rather broad 6.25–9.43 (M = 7.74) percent of length of head. Anterior nostril of eyed side on upper lip in front of lower eye, posterior nostril in anterior half of interorbital space. Snout narrowly rounded, 26.85–32.08 (M = 29.29) percent of length of head, rostral hook short, not reaching to vertical through front border of migratory eye. Maxillary extending well beyond fixed eye; angle of mouth extending to beyond vertical from posterior border of fixed eye and much nearer to tip of snout than to branchial opening; snout to angle of mouth 39.08–50.91 (M = 45.57), angle of mouth to branchial opening 54.02–58.39 (M = 55.40) percent of length of head.

Scales: Ctenoid on ocular side except those on lateral lines, scales on blind side and those on lateral lines of ocular side cycloid.

Lateral-Line System: Two lateral lines on ocular side, midlateral line with 84–91 scales, 14–16 scales between middle and upper lateral lines. No lateral line on blind side.

Interlinear scale rows

14

15

16

Frequencies

2

6

9

Fins: Dorsal with 119–125 (M = 121) rays, anal with 96–99 (M = 97) rays, caudal 12 in 15 specimens (radiographs).

Vertebrae: 57–59 comprising 9 abdominal and 48–50 caudal elements in 15 specimens (radiographs).

Coloration: Upper side more or less dark brown, lower rather whitish in preserved specimens.

Size: The largest specimen examined, 402.0 (370 + 32) mm, is from Nigeria, off Lagos.

DISTRIBUTION.—West Africa: Senegal to Nigeria and Congo. The record from the Netherlands coast (Nijssen, 1966) is a stray occurrence and the northernmost limit is most likely Senegal.

DIAGNOSIS AND AFFINITIES.—Cynoglossus browni shows affinities with C. senegalensis, C. canariensis, and C. monodi but can be readily distinguished by the total absence of a lateral line on the blind side.

TYPE SPECIMENS.—Holotype of C. senegalensis browni, MNHP 49.23, 219.5 mm SL, from Sierra Leone, west Africa.

OTHER MATERIAL EXAMINED.—10 specimens, USNM 188486, off Lagos, Nigeria, coll. A. Longhurst. 6, USNM 188437, off Nigeria, coll. A. Longhurst. 1, USNM 193914, off St. Paul R., Liberia, coll. George C. Miller. 1, ANSP 8690, Cape Palmas, Liberia, coll. Thomas S. Savage.

The bilineatus complex

Cynoglossus bilineatus, the only species of the bilineatus complex, is characterized by 12 rays in the caudal fin and two lateral lines on the blind side. Its most important difference from the members of the canariensis complex of species is an additional lateral line on the blind side. The nature of the scale pattern on the body is very similar to that of the members of the canariensis complex, especially in having cycloid lateral-line scales on the ocular side, and in the interlinear scale formula of 13–17 scales. The distribution of C. bilineatus, from the evolutionary center of the genus (Malay Archipelago) westward to India and Pakistan, south to New Guinea and Australia, and north to Taiwan and Japan, suggests its probable origin in the Malay Archipelago from an early stock of the canariensis group.

7. Cynoglossus bilineatus (Lacépède)

FIGURE 17; PLATE 4

Achirus bilineatus Lacépède, 1802:6 [type-locality: China and the East Indies].

Cynoglossus bilineatus.—Ogilby, 1910:39.—Weber, 1913b:443. —Norman, 1926:301 [Queensland]; 1928:198.—Weber and de Beaufort, 1929:194.—Herre, 1933:5 (Sandakan, N. Borneo); 1934:105 [Manila].—Roxas and Martin, 1937:70 [Philadelphia].—Hyardenberg, 1941:226 [Merauke, New Guinea].—Suvatti, 1950:326.—Hyerre, 1953:189 [Philippines].—Munro, 1955:264, pl. 50: fig. 767; 1958:285 [Merauke].—Saramma, 1963:75 [Kerala coast].—Pradhan, 1964:458 [Bombay coast].—Marshall, 1964:468, pl. 64: fig. 454 [east coast of North Queensland].

Plagusia quadrilineata Bleeker, 1851a:412; 1852:21.

Arelia quadrilineata.—Raup, 1858:107 [Java, Sumatra].—Oshima, 1927:198 [Tainan, Taihoku].

Cynoglossus quadrilineatus.—Günther, 1862:497.—Kner, 1867:295.—Bleeker, 1875:32, pl. 245: fig. 3.—Klunzinger. 1871:573.—Day, 1877 [in part]:435; 1880:409.—Madeay, 1884:53.—Alcock, 1889a:288.—Day, 1889 [in part]:457.—Smith and Pope, 1906:498 [Kochi].—Jenkins, 1910a:30.—Wu, 1932:144.

FIGURE 17.—Outline drawing ot C. bilineatus (BMNH 1931.4.23.52) from Java.

Cynoglossus lineolatus Steindachner, 1867:588 [Hong Kong].—Bleeker, 1873:133.—Rutter. 1897:88 [Swatow].—Reeves, 1927:14.—Chu, 1931:95.—Wu, 1932:150.—Fowler. 1934b:218 [Hong Kong, Swatow].

Cynoglossus quinquelineatus Day, 1877:432, pl. 98: fig. 1 [type-locality: Madras]: 1889:453.—De Silva, 1956:198.—Norman, 1928:197.

Cynoglossus sindensis Day, 1877:434, pl. 90: fig. 6 [type-locality: from Sind through the seas of India].—Jordan and Richardson, 1908:281.—Ogilby, 1910:37 [Croker Island, Northern Territory. Australia].—Norman, 1926:302.—De Silva, 1956:198.

Arelia diplasios Jordan and Evermann, 1903:367, fig. 29 [type-locality: Formosa].—Jordan and Richardson. 1909:202, fig. 25 [Formosa].—Oshima. 1927:204.

DESCRIPTION.—Based on 24 specimens, 95.0–338.0 mm SL, including the holotype of Cynoglossus quinquelineatus Day.

Depth of body 22.22–28.60 (M = 25.86), length of head 19.15–24.40 (M = 22.21) percent of standard length. Diameter of eye 6.40–11.90 (M = 9.04), interorbital width 5.0–10.71 (M = 7.86) percent of length of head. Two nostrils on eyed side, anterior one tubular, in front of lower eye. The posterior nostril in anterior half or middle of interorbital space. Snout rounded, 32.61–54.39 (M = 37.15), rostral hook, short, reaching hardly before vertical through front border of anterior nostril. Maxillary extending beyond fixed eye; angle of mouth extending to below vertical from posterior border of lower eye, slightly nearer to branchial opening than to tip of snout; snout to angle of mouth 46.44–56.90 (M = 51.38), angle of mouth to branchial opening 47.92–55.56 (M = 49.97) percent of length of head.

Scales: Ctenoid on ocular side except those on lateral lines; scales of blind side and those of lateral lines of ocular side cycloid.

Lateral-Line System: Two lateral lines on ocular side,[7] 88–96 scales on median lateral line, 13–16 scales between the two lines. Two lateral lines on blind side.

Interlinear scale rows

13

14

15

16

Frequencies

6

17

5

4

Fins: Dorsal with 107–113 (M = 110) rays; anal with 80–88 (M = 86) rays, caudal 12 in 10 specimens (radiographs).

Vertebrae: 51–53 comprising 9 abdominal and 42–44 caudal elements in 10 specimens (radiographs).

Coloration: Upper side in alcohol brownish with an irregular dark patch on opercular region, lower whitish.

Size: Largest specimen examined, 354.0 mm, is from Colombo.

DISTRIBUTION.—From Malay Archipelago to the coasts of India and Pakistan and to New Guinea (Croker Island, Northern Territory) and coasts of Queensland and Taiwan and Japan (Kuchi).

DIAGNOSIS AND AFFINITIES.—In the number of two lateral lines on both sides of the body, C. bilineatus approaches the attenuates complex; it is immediately distinguished from these species by having 12 rays in the caudal fin, whereas the species of the attenuatus complex have only 10. The interlinear count of 13–16 in C. bilineatus (10–11 in C. attenuatus, 16–18 in C. lachneri, and 18–20 in C. dispar) further distinguishes it from members of the attenuatus complex.

NOTE ON SYNONYMY.—Norman (1928:198) included C. quadrilineatus Bleeker and C. sindensis Day in the synonymy of C. bilineatus. Ochiai (1963: 76) synonymized A. diplasios Jordan and Evermann with C. bilineatus and 1 concur with them. Day (1877:432) described C. quinquelineatus on the basis of a single specimen in which an additional lower lateral line on the ocular side is present. Day further noted that his species differed from C. bilineatus in having a somewhat smaller eye, a shorter rostral hook, and in the position of the angle of the mouth, which extends hardly to the posterior edge of the eye. I have examined the holotype of C. quinquelineatus in Calcutta and found that, except in the additional lower lateral line, it differs from C. bilineatus in no other specific character. As has been pointed out earlier, the nature and extent of the lateral lines in Cynoglossus are of no significance in specific differentiation, and hence the development of incomplete lateral line on the lower part of the body in C. quinquelineatus is of no consequence so I have synonymized it with C. bilineatus.

Cynoglossus lineolatus, described on the basis of a single specimen, 106 mm in TL, from Swatow, Hong Kong and characterized as having two lateral lines on the blind side, is also referable to C. bilineatus.

TYPE SPECIMENS.—The type of C. bilineatus is not available in the Paris Museum (pers. comm., Madam Bauchot) and is not extant. Bleeker (1851a: 412) described Plagusia quadrilineatus on the basis of 18 specimens, 75–300 mm in TL, from Batavia, Sumatra, Muntok, and Bangka. In his Atlas (1875: 32, pl. 245: fig. 3), Bleeker described and illustrated a specimen of 300 mm in TL. Among the Bleeker collection of specimens in Leiden there are 9 specimens obtained from Batavia, west Sumatra, and Boeling (Bali) and cataloged as RMNH 6789, none of which matches either 75 or 300 mm. Since it is difficult to ascertain which specimen should be considered typical, all the 9 specimens in RMNH are assumed to be syntypes of P. quadrilineatus (Dr. M. Boeseman examined all the 9 specimens on my behalf and recommended this solution).

NHV 43.781, 102 mm SL, 111 mm TL, from Hong Kong, holotype of C. lineolatus.

Holotype of C. quinquelineatus, ZSI 1265, 234 mm SL, 250 mm TL, the figured specimen by Day (1877, pl. 98: fig. 1).

OTHER MATERIAL EXAMINED.—JAPAN: 1 specimen, USNM 59754, Japan, coll. H. M. Smith. 1, USNM 59755, Japan, coll. H. M. Smith. PHILIPPINES: I, USNM 83396, Philippine Islands,. coll. Hongkong Fisheries. 18.11.67. 1, USNM 113179. Limbones Cove, coll. Albatross. USNM 137652, Manila Mkt., coll. Albatross. 3, USNM (unregistered), Limbones Cove, coll. Hongkong Fisheries Sta, 18.11.67. 1. MCZ 30567, Macasser, Celebes, coll. T. Barbour. 2, ANSP 49038–39, Philippine. 1, NHV 43811, Manila, coll. Schilling, 1828. 1, BMNH 1872.1.18.18, Philippines, coll. Veitch. 7, USNM 137616–137620, Philippines and Borneo, coll. Albatross, 1907–1909. BORNEO: 1, BMNH 1895.2.28.63, Sarawak, coll. Brooke. INDONESIA: 3. USNM 72751, Java, coll. Bryant Palmer. 16, USNM 159420, Java, coll. Hubbs and Hardenberg, 6.15–1929. 5, MCZ 30803, Batavia, Java, coll. Bryan Palmer, 1909. 4, ANSP 772.74, Medan, Sumatra, coll. George Vanderbilt Sumatra Expd., 23.5 1939. 1, BMNH 1858.4.29.3, Amboyna, coll. Frank. 1, BMNH 1931.4.23.51. Batavia Mkt., coll. Hardenberg. 1, BMNH 1931.4.23.52, Java. coll. Hardenberg.

THAILAND: 2, ANSP 61829–31, Paknam, coll. R. M. de Schauensee, 21.8.1934. 2. ANSP 61827–28, Bangkok, coll. R. M. de Schauensee, 1734. 1, MCZ (unregistered), Thailand, 7°53′09″N, 98°50′07″E coll. BM Thai-Danish Expd., 15.2.1966. 1. NHV 43810. locality not given, coll. Hein, 1902. 1, CAS (CVF). Gulf of Thailand, lat. 10°26′S4″N, long. 9°15′24″E. coll. Thai Fishermen, Naga Expd., 1959–1961. 2, CAS (GVF), Gulf of Thailand, coll. Thai Fishermen, Naga Expd., 24–6.1960. 1, BMNH 1920.7.13.75, Thailand, coll. Prince Chumpen. SINGAPORE: 1, MCZ 32965, Singapore, coll. F. W. Putnam, 1864. 2, BMNH 1933.7.31.33, 34, Singapore Mkt.. ex. Raffles Museum. AUSTRALIA: 1, BMNH 1925.722.82, Queensland, coll. Endeavour. BURMA: 1, ZSI. 3444/1, Elephant point, Arakan coast, coll. Bengal Fisheries.

INDIA: 1, ZSI 12702, Ganjam coast, coll. Marine Survey. 2, ZSI 1145, 1146, Madras, coll. F. Day. 8, ZSI 1231–1234, 12263, Orissa coast, 7–8 fms, coll. Marine Survey. 1, ZSI 26227/1, Puri coast, Orissa, coll. Dr. A. Annandale. 2, ZSI F 2360/2, Marina Beach, Madras, ex. Southern Regional Sta, ZSI; Madras. 2, ZSI (unregistered), Karwar coast, Bombay, coll. Karwar Survey 1967. 1, Maharastra. lat. 18°15′N, long. 72°25′E, coll. F. H. Berry. 1, MCZ 4273, Malabar, coll. F. Day. 1, BMNH 1928.3.20.81, Madras Harbor, ex. Indian Museum. 2, BMNH 1928.3.20.82, 83, Orissa coast, 7–8 fms, ex. Indian Museum. 1, BMNH 1938.8.9.14. Calicut, coll. Devanesan. PAKISTAN: 8, SOSC, W Pakistan, W end of Astola Is., W of Karachi, lat. 25°06′35″N. long. 63°48′65″E, coll. Anton Bruun (Woods, Fehlman, Rogers, Stone, and Berry). 1, BMNH 1898.12.24.49, Karachi, coll. Townsend. 3. BMNH 1911.12.6.14, Karachi, coll. Townsend. CEYLON: 1. MCZ 33197, Colombo, coll. Capt. Putnam.

The attenuatus complex

Like C. bilineatus, the members of the attenuatus complex are large species with two lateral lines on the blind side but with only 10 rays in the caudal fin. Cynoglossus attenuatus and its relatives C. lachneri and C. dispar have their center of distribution in the central and western sectors of the Indian Ocean and may have descended from the same stock that gave rise to the bilineatus complex.

8. Cynoglossus attenuatus Gilchrist

FIGURE 18; PLATE 4

Cynoglossus attenuatus Gilchrist, 1905:11, pl. 29 [type-locality: Tugela R. mouth, 4½ miles northwest. South Africa].

Arelia attenuata.—Gilchrist and Thompson, 1917:398.—Regan, 1920:221 [Natal].—Barnard. 1925:413 [Natal and Zululand to Delagoa Bay].—Bonde, 1925:292.—Fowler, 1925:187; 1935:405.—Barnard, 1937:41.

Cynoglossoides attenuatus.—Bonde, 1922:23.

Arelia bilineata.—[not Lacépède], Smith, 1949 [in part]:166, pl. 2: fig. 341.

DESCRIPTION.—Based on 3 specimens, 158.0–244.0 mm SL, including the holotype.

Depth of body 21.20–25.59 (M = 23.36), length of head 20.89–21.95 (M = 21.12) percent of standard length. Diameter of eye 8.57–12.12 (M = 9.93), interorbital width 4.55–6.06 (M = 5.44) percent of length of head. Anterior nostril on eyed side in front of lower eye, at a level with its lower margin, posterior nostril in anterior half of interorbital space. Snout obtusely pointed 36.36–43.94 (M = 40.10) percent of length of head, rostral hook reaching below anterior nostril. Maxillary extending beyond fixed eye; angle of mouth extending to below vertical from posterior border of fixed eye, nearer to branchial opening than to tip of snout; snout to angle of mouth 52.27–57.58 (M = 54.08), angle of mouth branchial opening 47.73–50.48 (M = 49.04) percent of length of head.

Scales: Ctenoid on ocular side, cycloid on blind side; scales on lateral lines of ocular side ctenoid anteriorly and cycloid posteriorly.

Lateral-Line System: Two lateral lines on ocular side, median lateral line with 70–76 scales, 10–11 scales between them. Two lateral lines on blind side with 11–12 scales between them.

Interlinear scale rows

10

11

Frequencies

1

1

Fins: Dorsal with 114–118 rays; anal with 90–91 rays, caudal 10 in 2 specimens (radiographs).

Vertebrae: 54–55, comprising 9 abdominal and 45–46 caudal elements in 2 specimens (radiographs).

Coloration: Upper side uniformly brown, lower whitish in preserved specimens.

Size: The largest specimen examined, 310 (290 + 10) mm, is from Durban, South Africa.

DISTRIBUTION.—South Africa: Natal and Zululand to Delagoa Bay.

DIAGNOSIS AND AFFINITIES.—Cynoglossus attenuates, which is restricted in its distribution to South Africa, is related to C. lachneri and C. dispar. Phylogenetically, it is most probable that C. attenuatus was derived from a population of the early generalized stock of the bilineatus-attenuatus complex in South African waters. The attenuated nature of body (mean depth of 23 percent of SL, cf. 25.95 of C. lachneri and 29.87 of C. dispar) and large scales (10–11) distinguish it from the other species (16–18 in C. lachneri and 18–20 in C. dispar).

TYPE SPECIMEN.—BMNH 1903.12.31.10, holotype of C. attenuates, 210 mm SL, 4½ miles, NW of south head of R. Tugela, Natal, 24 fms, coll. Gilchrist.

OTHER MATERIAL EXAMINED.—1 specimen, BMNH 1919.9.12.51, Durban, coll. Marley. 2, ANSP 88867, Delagoa Bay, South Africa, coll. H. W. Bell Harley, 1923.

FIGURE 18.—Outline drawing of C. attenuatus (BMNH 1919.9.12.51) from Durban.

9. Cynoglossus lachneri, new species

PLATE 5

DESCRIPTION.—Based on 12 specimens (130.0–4 32.0 mm SL), including the holotype and paratypes.

Depth of body 24.62–27.19 (M = 25.95), length of head 17.48–23.14 (M = 19.43) percent of standard length. Diameter of eye 7.41–10.89 (M = 9.34), interorbital width 6.98–9.76 (M = 8.20) percent of length of head. Anterior nostril of the eyed side tubular, on the upper lip, situated almost vertical through the anterior border of upper eye, and some distance in front of lower eye, posterior nostril a simple opening, in anterior half of interorbital space. Two nostrils on blind side, the tubular anterior one on the anterior half of the upper lip, the posterior a little higher and above posterior half of upper lip. Snout rounded, 28.40–34.26 (M = 31.47) percent of length of head; rostral hook rather short, scarcely reaching vertical through front border of migratory eye. Maxillary extending beyond hind border of fixed eye; angle of mouth extending below vertical from hind border of fixed eye, nearer to tip of snout than to branchial opening; snout to angle of mouth 45.73–50.00 (M = 47.02), angle of mouth to branchial opening 50.00–55.81 (M = 52.84) percent of length of head.

Scales: Ctenoid on ocular side, except those on lateral lines; scales on blind side and those on lateral lines of ocular side cycloid.

Lateral-Line System: Two lateral lines on eyed side, midlateral line with 100–111 scales, 16–18 scales between the two lines. Two lateral lines on blind side.

Interlinear scale rows

16

17

18

Frequencies

3

7

2

Fins: Dorsal with 113–121 (M = 117), anal with 92–98 (M = 96) rays, caudal 10 in 7 specimens (radiographs).

Vertebrae: 55–58, comprising 9 abdominal and 46–49 caudal elements in 7 specimens (radiographs).

Coloration: Upper side uniformly dark brown, lower whitish in preserved specimens.

Size: Largest specimen examined, 461.0 (432 + 29) mm, is from Mombasa, the holotype of lachneri.

DISTRIBUTION.—Mozambique (Inhaca) coast northward to Red Sea and Gulf of Oman and eastward to Anjouan (Comoro) and Nossi-Be Islands and Seychelles.

DIAGNOSIS AND AFFINITIES.—Cynoglossus lachneri has close affinities with C. attenuatus and C. dispar and in many characters is intermediate between these two species. It is distinguishable, however, by its interlinear scale count (16–18 cf 10–11 in C. attenuatus, and 18–20 in C. dispar).

TYPE SPECIMENS.—USNM 201852, holotype of C. lachneri, 432 mm SL, Mombasa, Kenya, coll. Anton Bruun. 16.11.1964. Paratypes: 1 specimen, USNM 203963, paratype of C. lachneri, 285 mm SL, Sandy Cove behind reef of Nosi N’ Tanga Nossi-Be, Madagascar, lat. 13°22′07″S, long. 48°10′45″E, coll. Anton Bruun. 1, USNM 171046, paratype of C. lachneri, 270 mm SL, Madagascar, coll. Dr. J. Millot, Feb 1953. 1, MCZ 11551, paratype of lachneri, 234.5 mm SL, Zanzibar, coll. Cooke. 1, NHV 43874, paratype of C. lachneri, 130 mm SL, Red Sea, coll. Staind; 1895–1896. 1, RU, paratype of C. lachneri, 190 mm SL, Tiwi, Gulf of Oman, coll. Mrs. J. L. B. Smith. 1, RU, paratype of C. lachneri, 226 mm SL, Silhoutla Bay, Seychelles, coll. J. L. B. Smith. 3, ZSI , paratype of C. lachneri, 176–274 mm SL, Pinda Beach, Mozambique, coll. J. L. B. Smith. 1, , paratype of C. lachneri, 326 mm SL, Red Sea, Harkiko Bay, coll. H. Steinitz. 1, ZSI , paratype of C. lachneri, 227 mm SL, Inhaca, Mozambique, coll. Mrs. J. L. B. Smith, Aug 1948.

OTHER MATERIAL EXAMINED.—2 specimens, BMNH 1869.3.1.30–31, Seychelles, coll. Wright. 1, BMNH 1932.7.29.53, Seychelles, coll. Wood.

10. Cynoglossus dispar Day

FIGURE 19; PLATE 5

Cynoglossus dispar Day, 1877:434, pl. 96: fig. 2 [type-locality: Bombay]; 1889:456.—Norman, 1928:199 [Bombay, Madras].—Pradhan, 1964:458 [Bombay coast].

DESCRIPTION.—Based on 12 specimens, 167.0–350.0 mm SL, including the lectotype and paralectotypes of C. dispar.

Depth of body 24.81–32.58 (M = 29.87), length of head 18.83–21.35 (M = 20.17) percent of standard length. Diameter of eye 7.81–9.91 (M = 8.75), interorbital width 4.48–9.01 (M = 5.95) percent of length of head. Two; nostrils on ocular side, a simple one in anterior half of interorbital space, and a tubular one in front of lower eye. Snout rounded 16.42–31.53 (M = 26.60) percent of length of head, rostral hook, short and not extending to vertical through the front border of upper eye. Maxillary extending to beyond posterior border of fixed eye; angle of mouth extending to about or almost below vertical from hind border of fixed eye, much nearer to tip of snout than to branchial opening; snout to angle of mouth 38.81–52.25 (M = 43.50), angle of mouth to branchial opening 46.85–58.73 (M = 56.0) percent of length of head.

FIGURE 19.—Outline drawing of C. dispar (BMNH 1889.2.1.4062) from Madras.

Scales: Ctenoid on ocular side except those on lateral lines; scales of blind side and those of lateral lines of ocular side cycloid.

Lateral-Line System: Two lateral lines on eyed side, 102–119 scales on median lateral line, 18–20 scales between them. Two lateral lines on blind side.

Interlinear scale rows

18

19

20

Frequencies

2

3

3

Fins: Dorsal with 109–113 rays, anal with 90–92 rays, caudal 10 in 5 specimens (radiographs).

Vertebrae: 53–54, comprising 9 abdominal and 44–45 caudal elements in 5 specimens (radiographs).

Coloration: Upper side brownish with somewhat darker irregular blotches, lower whitish in preserved specimens.

Size: Largest specimen examined, 389 (350 + 33) mm, is from Karachi, west end of Astola Island, trawled by Anton Bruun.

DISTRIBUTION.—India: Madras and Bombay; Pakistan: Astola Island, west of Karachi.

DIAGNOSIS AND AFFINITIES.—Cynoglossus dispar is closely allied to C. lachneri but it can easily be separated by its deeper body (mean depth of body 29.87 percent of SL cf. 25.95 percent of SL) and larger scales (18–20 cf. 10–11 in C. attenuatus and 16–18 in C. lachneri).

NOTE ON SYNONYMY: Originally described by Day from specimens from Bombay and Madras, C. dispar was well diagnosed and there has been no confusion with regard to its identity.

TYPE SPECIMEN: Day (1877:434) described C. dispar from an unstated number of specimens from Bombay and Madras. Norman (1928:199) redescribed the species from 4 specimens, 95–350 mm in TL, including examples believed to be the types of the species. Of the register numbers ZSI 1141 and ZSI 1144, which Norman had listed as seen, only the specimen bearing number ZSI 1141 is at present available in the collections of the Zoological Survey of India. The other one was presumably lost in the Varuna floods of Banaras in 1943, where the collections were temporarily shifted during World War II. There are at present six specimens of the syntype series that are traceable; including the one lost, there must have been seven in the series. A specimen, ZSI 2715, 260 mm SL, from Sind collected by F. Day, which formed the basis for Day’s figure (pl. 96: fig. 2), is selected here as the lectotype, and the rest of the five specimens ZSI 1141, Bombay, coll. Day, BMNH 1889.2.1.4061, Sind, coll. F. Day, BMNH 1889.2.1.4062, Madras, coll. F. Day, BMNH 1889.2.4063, Bombay, coll. F. Day, NHV 482 Madras, coll. F. Day are selected as paralectotypes.

OTHER MATERIAL EXAMINED.—INDIA: 11 specimens, BMNH 1928.3.20.84, Bombay, ex. Indian Museum. 1, BMNH 1933.1.2.6. S. Malabar, coll. Devanesan. PAKISTAN: 5, SOSC Acc 23, Karachi, west end of Astola Is., lat. 25°06′35″N, long. 63°8′65″E.

The kopsi group

Several related species complexes of Cynoglossus may be assembled together in the kopsi group, kopsi being closest to the evolutionary stem of this group. They are typified by the smaller adult size, large eyes, either contiguous or with a very narrow interoribital space, two nostrils, the posterior one occasionally hidden under scales or absent (sealarki and itinus complexes), short obtusely pointed snout with the angle of the mouth situated nearer to tip of snout than to branchial opening, one to three lateral lines on ocular side, the dorsolateral and the ventrolateral either absent or incomplete, no lateral line on blind side, 10 or 8 rays in the caudal fin, and large scales. The absence of a lateral line on the blind side, the reduced number of rays in the caudal fin, the contiguous or subcontiguous nature of the eyes, and the absence of the posterior nostril in the sealarki and itinus complexes are considered as specializations.

Included in this group are the kopsi, itinus, ogilbyi, ecaudatus, and sealarki species complexes. Their combined range extends to almost the entire distributional limits of the genus.

The kopsi complex

This complex includes the morphologically most generalized species of the group. These species have 7 to 12 interlinear scale rows, both the anterior or posterior nostrils present, and the dorsolateral line extending to varying distances along the dorsal contour (when the ventrolateral line is absent) or with an uninterrupted dorsolateral line (when the ventrolateral is present).

Included in this assemblage are C. kopsi, C. interruptus, and C. joyneri. Its center of distribution covers the whole of the Indo-Australian Archipelago, northward through the Philippines to Taiwan and Japan, and westward through the seas of India and Pakistan to Cargados Garajos, the Seychelles, and the Persian Gulf.

11. Cynoglossus kopsi (Bleeker)

FIGURE 20; PLATE 6

Plagusia kopsii Bleeker, 1851b:494 [type-locality: Rio in Bintang Island, southeast of Singapore]; 1852:31; 1854a:99.

Arelia kopsi.—Bleeker. 1859:184.

Cynoglossus kopsii.—Günther, 1862:493 [East Indian Archipelago].—Bleeker, 1875:31. pl, 241; fig. 3.—Weber and de Beaufort, 1929:189.

Cynoglossus kopsi morpha diagramata Chabanaud [in part], 1951d:273 [type-locality: Arafura Sea].

Cynoglossus brachycephalus Bleeker, 1875:38, pl. 244; fig. 6 [type-Iocality:Sumarta].—Regan, 1908:235 [Maldives and Cargados Carajos].—Weber, 191Sb:441.—Norman [in part], 1928:211.—Weber and de Beaufort, 1929:207 [W. Sumatra].—Munro, 1955:265, fig. 772 [Pearl Banks].—De Silva, 1956:199 [Aripu].—Fowler, 1956:188.—Saramma, 1963:78 [Kerala Coast].—Chen and Weng, 1965:93, fig. 64 [Tungkong].

Brachycephalus (Cynoglossus) brachycephalus.—Chabanaud, 1951b:78.

Cynoglossus praecisus Alcock, 1890b:442 [type-locality: off Ganjam coast]

Cynoglossus brevirostris [not Day].—Johnstone, 1904:209; Chen and Weng, 1965:92, fig. 63 [Tainan].

Cynoglossus versicolor Alcock, 1890b:442 [type-locality: Orissa coast].—Alcock; 1896:330.—Norman, 1928:195.—Punpoka, 1964:74 [Chumpora Province, Thailand].

Cynoglossus sibogae Weber, 1913b:442.—Weber and de Beaufort, 1929:200, fig. 54.—Herre, 1934:105 [Banang Sur, La Union Province, Luzon]; 1953:191.—Punpoka. 1964:71 [Goh Korma].

Cynoglossus interruptus [not Günther].—Chen and Weng, 1965:90, fig. 61 [Pescadores, Taiwan].

Cynoglossus melanopterus [not Bleeker] Shen, 1929:21 [type-locality: Hong Kong].

DESCRIPTION.—Based on 43 specimens, 50.0–177.0 mm SL, including the paralectotype of Weber’s C. sibogae, the holotype of C. versicolor, and the holotype of C. kopsi diagramata.

Depth of body 22.43–33.87 (M = 26.60), length of head 15.84–24.59 (M = 21.47) percent of standard length. Diameter of eye 11.76–19.05 (M = 14.22) percent of length of head, interorbital space absent. Two nostrils on ocular side, the anterior tubular in front of lower eye, the posterior nostril simple and in front of the interorbital space, sometimes hidden under scales. Snout rounded 24.24–40.62 (M = 28.80) percent of length of head; rostral hook short, extending to front of anterior nostril. Maxillary extending to below posterior half of fixed eye; angle of mouth extending to below vertical from anterior half of fixed eye, much nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 35.42–59.38 (M = 41.83), angle of mouth to branchial opening 48.48–68.75 (M = 57.80) percent of length of head.

Scales: Ctenoid on both sides, including those of lateral lines.

FIGURE 20.—Outline drawing of C. kopsi showing variation in number and extent of lateral lines: a, specimen 67.5 mm SL (BMNH 1934.9.6.7) from Singlap, Singapore; b, specimen 11.32 mm SL (BMNH 1890.2.26.147) from Arafura Sea; c, specimen 150.0 mm SL (BMNH 1933.7.31.30) from Singapore.

Lateral-Line System: Usually two or three lateral lines on ocular side, dorsolateral line undulating and extending along the dorsal contour of body to varying distances, midlateral line with 57–72 (M = 60) scales, 7–12 (M = 9) scales between the upper and the middle lateral lines. Ventrolateral line sometimes present, extending to varying distance. No lateral line on blind side.

Interlinear scale rows

7

8

9

10

11

12

Frequencies

4

5

14

4

2

3

Fins: Dorsal with 105–115 (M = 107) rays, anal with 80–91 (M = 82) rays, caudal 10 in 30 specimens (radiographs).

Vertebrae: 50–55, comprising 9 abdominal and 41–46 caudal elements in 30 specimens (radiographs).

Coloration: Upper side brownish, generally with irregular darker spots, lower whitish in preserved specimens.

Size: Largest specimen examined, 187 (177 + 10) mm, from China Sea near Hongkong, Albatross collection.

DISTRIBUTION.—From Indo-Australian Archipelago to Philippines and Taiwan and westward to seas of India and Persian Gulf.

DIAGNOSIS AND AFFINITIES.—Cynoglossus kopsi and C. interruptus are allopatric species resembling each other in their relatively small size, relatively large contiguous eyes, short and somewhat obtusely pointed snout, two or three interrupted lateral lines on ocular side, and 10 rays in the caudal fin; C. kopsi is distinguishable, however, by its larger scales, the interlinear scale count being 7–12, M = 9 cf. 11–12, M = 11 in C. interruptus and by usually having two lateral lines, the ventrolateral line occurring only rarely.

NOTE ON SYNONYMY.—Bleeker (1851b:494) described C. kopsi from Rio in Bintang, off south-eastern Singapore and characterized it as having subcontiguous eyes, three lateral lines on the ocular side, and none on the blind side, without indicating, however, the number of scale rows between the middle and the upper lateral lines. Because of the omission of the key character of interlinear scale row from the original description of C. kopsi, there has been considerable confusion in the identity of it. In his Atlas (1875, pl. 241: fig. 3) Bleeker, however, gave an excellent illustration and indicated nine rows of interlinear scale rows. In his description of C. brachycephalus (1875:38) from Sumatra, Bleeker again delineated this species with subcontiguous eyes and two nostrils but with only two later lines on the ocular side. In this case also, Bleeker made no mention of the number of interlinear scale rows present in the species, though in his illustration (1875, pl. 244: fig. 6) nine rows can be distinctly seen. Thus, the presence of an additional lateral line in C. kopsi is the only difference distinguishing it from C. brachycephalus. An additional lower lateral line as has been stated earlier is of no importance in species differentiation in Cynoglossus and I have, therefore, considered these two species as synonymous.

Norman (1928:211) included C. praecisus and C. sibogae in C. brachycephalus and concluded that “this species is very closely related to C. kopsi Bleeker, with which it may prove to be identical. There is no trace, however, of a lower lateral line on the ocular side in any of the specimens described above.” I have examined the types of C. praecisus and C. sibogae and I corroborate Norman’s tentative conclusion that all three of these species, C. praecisus, C. sibogae, and C. brachycephalus, are synonymous with C. kopsi.

Alcock (1890b:442) described C. versicolor, based on a single specimen obtained by RIMS Investigator off the Orissa coast, and characterized it as having a single nostril and 12 series of scales between the upper and middle lateral lines. On a reexamination of the type, Norman (1928:195) noted the presence of posterior nostril and traces of an incomplete lower lateral line, characters distinctive of C. kopsi. I have examined the holotype of C. versicolor and I consider it here as conspecific with C. kopsi.

Cynoglossus melanopterus Shen described on the basis of eight specimens, 120 to 152 mm in TL, from Talo Harbour, Hongkong is the same as the present species. From the description of the fish as having small subcontiguous eyes, two nostrils, three lateral lines on ocular side, and ctenoid scales on the body, it does not appear to differ a bit form C. kopsi and 1 have, therefore, synonymized them.

TYPE SPECIMENS.—Bleeker’s original description of C. kopsi was based on two specimens, 125 and 130 mm in TL, and he illustrated the 125-mm specimen in the Atlas. In the Bleeker collection of specimens there is only one specimen, though three are recorded in the register and in the card index and two in the auction catalog of 1879 (pers. comm., Dr. M. Boeseman). A specimen 119 mm SL, 125 mm in TL, cataloged as RMNH 7680. Rio (Riau Archipelago), coll. G. F. de Bruyn Kops, 1851, is selected here as the lectotype of C. kopsi.

Cynoglossus brachycephalus was based on two specimens, 105 and 125 mm in TL, and the illustration drawn from the 125-mm specimen. Chabanaud (1946) selected a specimen, 118 mm SL approximately 124 mm TL, from west Sumatra, RMNH 17877, as lectotype of C. lectotype of C. brachycephalus; it was taken from a jar of Bleeker’s collection from the 1879 auction cataloged as SMNH 6800 containing five specimens. Weber (1913b:442) described C. sibogae on the basis of two specimens, 77 and 61 mm, from Molo Strasse (Siboga Sta 51) and Lirung, Insel Saliban (Siboga Sta 133), respectively. The Molo Strasse specimen, 77 mm, which is figured, is selected here as the lectotype and the other specimen the paralectotype. Both the types are in the Zoological Museum, Amsterdam (pers. comm., Dr. N. Nijssen), but I have examined only the paralectotype. Holotype of C. praecisus Alcock, ZSI 12843, 111 mm SL, from Ganjam coast, coll. Marine Survey. Holotype of C. versicolor, ZSI 12895, 116 mm SL, from Orissa coast, coll. Marine Survey. Holotype of C. kopsi diagramata, BMNH 1890.2.—26.147, 109 mm SL, from Arafura sea, coll. Challenger.

OTHER MATERIAL EXAMINED.—CHINA: 1 specimen, USNM 113181, China Sea near Hongkong, coll. Albatross. 1, USNM 137982, China Sea, near Hongkong, coll. Albatross. 3, USNM 192859, Ma Kung Mkt., Taiwan, coll. Kuntz and Wells. 2, SUSC Ref 340, off Teluk Kau, Halmahera, lat. 01°08.6′N, long. 128°01′E, 30–25 fms coll. Tevega Expd. 2, SOSC Ref 340, South China Sea, off Sarawak, lat. 4°44′N, long. 113°25′E, 100 mm coll. Tevega Expd. 1, BMNH 1855.9.19.1247, China, coll. Belcher. 1, BMNH 1862.6.3.18, China, coll. P. Bleeker. 1, BMNH 1935.4.18.7. South China Sea, coll. Lin.

PHILIPPINES: 11, USNM 112872 Illoilo, coll. Kuntz and Wells. 1, USNM 112873, Illoilo. coll. Kuntz and Wells. 3, USNM 112874, Illoilo, coll. Kuntz and Wells. 1, USNM 113178, Antonie Is., coll. M. Weber, Aug 1899. 1, USNM 137653, Towi, coll. Albatross. 1, USNM 137691, Ragay R., Ragay Gulf, coll. Albatross. 74, USNM 148586, Illoilo, coll. Keller. SINGAPORE: 1, BMNH 1933.7.31.30. Singapore, ex. Raffles Museum.

INDONESIA: 1, BMNH 1879.5.14.81, Arafura Sea, coll. Challenger. 2, UZMK (unregistered), Java Sea, lat. 5°08′S, long. 106°22′E, 35 m, coll. Th. Mortensen, 26.7.22. 1, UZMK (unregistered), Java, lat. 5°53′S, long. 05°34′E, 25 m, coll. Th. Mortensen. 1, UZMK (unregistered), Java Sea, 12 m, coll. Th. Mortensen, 5″8″22. 1, UZMK (unregistered), Java Sea, lat. 106°03′E, long. 5°23′S, coll. Th. Mortensen, 6.8.22. 1, UZMK (unregistered), Java Sea, lat. 5°57′S, long. 106°84′E, 22 m, coll. Th. Mortensen, 7.8.1922. 1, UZMK (unregistered), Amboina, ca. 50 fms, coll. Th. Mortensen, 2.11.11. 1, UZMK (unregistered), Amboina, coll. Th. Mortensen, 24.11.22. 1, UZMK (unregistered), Java Sea, lat. 8°26′S, long. 114°29′E, 70 m, coll. Th. Mortensen, Java-S Africa Expd., 5.4.1929.

THAILAND: 1, CAS (GVF) 2312, Chumphon Prov. Gulf of Thailand, coll. Naga Expd. 1959–1961. 10, CAS (GVF) 2312, Gulf of Thailand, lat. 12°16′45″N, long. 100°07′15″E, coll. Naga Expd., 1959–1961. INDIA: I, SOSC Ref 381, Pondicherry, Madras State, coll. F. H. Berry, 5.10.66. 4, BMNH 1928.3.20.101–104, Madras coast, 20 fms, ex. Indian Museum. 1, BMNH 1928.3.20.106, Ganjam coast, ex. Indian Museum. 10, ZSI 13021–34 Madras coast, 20 fms, coll. Marine Survey. PERSIAN GULF: 1, ZSI (unregistered), Persian Gulf, 20°20′N, 48°47′E, 19.11.190, Marine Survey Sta 352, coll. Investigator. 1, UZMK (unregistered), Persian Gulf, ca. 50 fms, 1937–1938. MADAGASCAR: 2, SOSC Ref 170, lat. 16° 11′S, long. 43°53′E, 62 m, coll. Anton Brunn, 18.10.64. 1, SOSC Ref 170, lat. 16°03′S, long. 44°09′E, coll. Anton Brunn. MALDIVE ISLANDS: 1, BMNH 1901.12,31, 120, Maldives, coll. Gardiner. ST BRANDON GROUP: 4, BMNH 1908.3.23.149–52, Cargados Garajos, coll. Gardiner. MERGUI ARCHIPELAGO: 1, ZSI (unregistered). Mergui Archipelago 12°35′N, 38°16′E, Marine Survey Sta 552, coll. Investigator.

12. Cynoglossus interruptus Günther

FIGURE 21

Cynoglossus interruptus Günther, 1880:70, pl. 30: fig. B [type-locality: Yokohama, Japan].—Steindachner, 1896:220 [Kobe, Hioga, Nagasaki].—Jordan and Snyder, 1900:380 [Tokyo]; 1901:123 [Yokohama].—Smith and Pope, 1906: 498.—Wu, 1932:146.—Ochiai, 1959:202; 1963:82, pl. 17: fig. 2.—Chu, 1963:538, fig. 403.—Shen, 1967:212 [Hong Kong].—Ochiai, 1966:84.

Areliscus interruptus.—Jordan and Starb, 1906a:240 [Tokyo, Nagasaki, Wakanoura, Matsushima, Onomichi].—Snyder, 1912:441.—Jordan, Tanaka, and Snyder, 1913:336.—Jordan and Thompson, 1914:213.—Hubbs, 1915:494.—Jordan and Hubbs, 1925:302 [Toba, Kobe, Mikawa, Misaki].—Reeves, 1927:14.—Ui, 1929:276.—Schmidt and Lindberg, 1930:1149.—Chu, 1931:95.—Kamohara, 1934: 462:—Kuronuma, 1939:83.—Yanai, 1950:22.—Kuroda, 1951: 390.—Honma, 1952:225.—Mori, 1952:184.

Cynoglossus nigropinnatus Ochiai, 1959:205 [type-locality: Owase, Mimase, Kochi, Japan]; 1963:85, pl. 19.

FIGURE 21.—Outline drawing of C. interruptus, holotype (BMNH 1879.5.14.92) from Yokohama, Japan.

DESCRIPTION.—Based on 34 specimens, 89.0–158.0 mm SL.

Depth of body 25.47–35.62 (M = 28.97), length of head 18.52–24.11 (M = 21.25) percent of standard length. Diameter of eye 10.53–21.05 (M = 14.18) percent of length of head, interorbital space absent. Two nostrils on ocular side, anterior nostril tubular in front of fixed eye, posterior nostril simple, just above anterior border of lower eye. Snout rounded, 25.0–37.14 (M = 31.81) percent of length of head, rostral hook short, extending only to front of anterior nostril. Maxillary extending to just below middle of fixed eye; angle of mouth extending to below vertical from anterior half of lower eye, much nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 33.33–52.63 (M = 43.84), angle of mouth to branchial opening 36.36–63.16 (M = 56.02) percent of length of head.

Scales: Ctenoid on both sides, including those on lateral lines; scales small, moderately serrated with short ctenii on blind side, weakly serrated on ocular side.

Lateral-Line System: Two or three lateral lines on ocular side. Dorsolateral line undulated, interrupted at middle of body, becoming obscure or runnng backward along the dorsal contour entering dorsal fin along 8th to 12th rays counted from the rear; the ventrolateral line absent or present, when present either interrupted at middle of body or running backward and entering anal fin a few rays counted from the rear. The dorsolateral line is usually well developed when the ventrolateral line is present to the fullest extent. Midlateral line with 60–67 (M = 63) scales, 11–12 scales between middle and upper lateral lines. No lateral line on blind side.

Interlinear scale rows

11

12

Frequencies

17

14

Fins: Dorsal with 103:110 (M = 107) rays, anal with 84–86 (M = 85) rays, caudal 10 in 5 specimens (radiograph).

Vertebrae: 52, comprising 9 abdominal and 43 caudal elements in 5 specimens (radiograph).

Coloration: Upper side brownish, with or without dark blotches, blind side yellowish in preserved specimens.

Size: Largest specimen examined, 168 (158 + 10) mm, is from Mimase, Kochi, Japan.

DISTRIBUTION.—Japan.

DIAGNOSIS AND AFFINITIES.—Cynoglossus interrupts, which is restricted to Japan, can be readily separated from C. kopsi by its smaller scales (11–12, M = 11 cf 7–12, M = 9) and usually by the occurrence of a ventrolateral line which is absent in the holotype.

NOTE ON SYNONYMY.—Günther (1880:70) described C. interruptus on the basis of two specimens, the largest being 150 mm in TL and characterized it as having two lateral lines, upper reaching only two-thirds to caudal, and 12 rows of scales between the middle and the upper. A similar species, C. nigropinnatus, was described by Ochiai on the basis of 84 specimens, 80.5–211 mm SL, from Owase, Kochi, and Mimase and was characterized by having three lateral lines on the ocular side, the middle and the upper being separated by 10 rows of scales, and with ctenoid scales on the body. Comparison of numerous specimens of C. interruptus has shown beyond doubt that the depth of the body and the presence of an additional lower lateral line noted by Ochiai fall within the normal range of variation of C. interruptus. I have, therefore, included C. nigropinnatus in the synonymy of C. interruptus.

TYPE SPECIMENS.—Holotype of C. interruptus, BMNH 1897.5.14.92, 140 mm SL, from Yokohama, Japan, coll. Challenger; paratype, BMNH 1890.7. 26.146, 140 mm SL, obtained along with the holotype. One paratype of C. nigropinnatus, KU 18336, 158 mm SL, two paratypes KU 36619 and KU 26620, 156 and 131 mm SL, Mimase, Japan, coll. Kyoto University.

OTHER MATERIAL EXAMINED.—CHINA: 1 specimen, BMNH 1848.3.16.195, China, coll. Belcher. JAPAN: 2, BMNH 1902.10.31.146–47, Japan, coll. Gordon Smith. 10, BMNH 1923.2.26.650–59, Tokyo, coll. Jordon. 8, BMNH 1923.2.26.660–667, Wahanoura, coll. Jordon. 30, USNM 56360, Nagasaki, col. Bureau Com. Fisheries. 1, USNM 59757, Kagoshima, coll. H. M. Smith. 1, USNM 59756, Kochi, coll. H. M. Smith. 1, USNM 71955, Suruga, coll. Albatross. 1, USNM 73868, Yenoshima. 1, USNM 77065, Japan, coll. Albatross. 8, USNM 151810 Kobe, coll. D. S. Jordan and Yamamoto, 1922. 5, USNM 152480. Kobe, coll. D. S. Jordon. 1922. 1, NHV 43777, Tokyo, coll. Doderlein.

13. Cynoglossus joyneri Günther

FIGURE 22; PLATE 6

Cynoglossus joyneri Günther, 1878:486 [type-locality: Tokei, Japan]; 1880:70 pl. 30; fig. A [Tokyo].—Otaki, 1897:25.—Wu, 1932:154; 1933:61 [Chefoo].—Wu and Wang. 1933:304 [China].—Chabanaud, 1951d:269.—Tchang, 1955:301, fig. 186.—Ochiai, 1959:208; 1963:88, pl. 18.—Chu, 1963:542, fig. 408.—Shen, 1967:211 [Kowloon].

Areliscus joyneri.—Jordan and Snyder, 1900:380 [Tokyo].—Jordan and Starks, 1906a:241 [Tokyo].—Smith and Pope, 1906:498 [Kochi].—Snyder. 1912:441 [Kagoshima].—Jordan, Tanaka and Snyder, 1913:336 [listed].—Jordan and Hubbs, 1925:302.—Kuroda, 1931:122.—Kamohara, 1938:62 [Tosa].—Kuronuma, 1939:83.—Yanai, 1950:22.—Kuroda, 1951:390.—Kamohara, 1952:85.—Honma, 1952:225.—Chen and Weng, 1965:100, fig. 70 [Tung Kong].

Cynoglossus (Areliscus) lighti Norman, 1925:270 [type-locality: Amoy and Wenchow].

Cynoglossus lighti.—Chu, 1931:95.—Wu, 1932:155 [Tang-Tchou and Amoy].—Chabanaud, 1951a:270.—Wang, 1933:63, fig. 30.

Trulla lighti.—Fowler, 1954b:216.—Chen, 1951:123.

Areliscus tenuis Oshima, 1927:201 [type-locality: Tainan].

Cynoglossus tshusanensis Chabanaud, 1951d:270 [type-locality: Tshusan Archipelago, China].

FIGURE 22.—Outline drawing of C. joyneri (BMNH 1924.12.15.87) from Amoy, China.

DESCRIPTION.—Based on 10 specimens, 193.0–199.0 mm SL.

Depth of body 20.28–43.64 (M = 25.88), length of head 18.86–40.00 (M = 23.75) percent of standard length. Diameter of eye 7.14–10.14 (M = 8.80), interorbital space 4.76–7.95 (M = 4.46) percent of length of head. Two nostrils on ocular side, anterior nostril tubular in front of lower eye, posterior nostril simple in anterior half of interorbital space. Snout obtusely pointed, 32.73–42.03 (M = 36.54) percent of length of head, rostral hook rather short and extending to front of anterior nostril. Maxillary extending well beyond posterior border of fixed eye; angle of mouth extending to almost below vertical from posterior half of fixed eye or even beyond, being more or less midway between tip of snout and branchial opening; tip of snout to angle of mouth 47.62–60.32 (M = 51.34), angle of mouth to branchial opening 47.06–63.49 (M = 52.26) percent of length of head.

Scales: Ctenoid on ocular side, including those of lateral lines; on the blind side scales are cycloid on head, weakly ctenoid on body.

Lateral-Line System: Usually three lateral lines on eyed side, the dorsolateral line undulates and runs backward along dorsal contour of body, usually entering dorsal fin along 7th ray counted from the rear, midlateral line with 66–72 (M = 70) scales, 11–12 (M = 12) scales between middle and upper lateral line, ventrolateral line usually present, entering anal fin along 5th to 7th ray counted from the rear. No lateral line on blind side.

Interlinear scale rows

11

12

Frequencies

1

8

Fins: Dorsal with 105–112 (M = 109) rays, anal with 81–85 (M = 83) rays, caudal 10 in 7 specimens (radiographs).

Vertebrae: 50–53 (M = 51) comprising 9 abdominal and 41–44 caudal elements in 7 specimens (radiograph).

Coloration: Upper side brownish, blind side yellowish white in preserved specimens.

Size: Largest specimen examined, 231.5 mm SL, is from Japan (BMNH 1878.4.5.94).

DISTRIBUTION.—From South China Sea through Taiwan, Tung-hai, Yellow Sea, Po-hai to Korea and Japan.

DIAGNOSIS AND AFFINITIES.—Cynoglossus joyneri is closely related to C. interruptus; it is, however, distinguished by its longer obtusely pointed snout (36.54 percent cf. 31.81 percent of head length) and the situation of the angle of mouth, which is somewhat midway between the tip of snout and branchial opening, whereas it lies very much nearer to the tip of snout than to branchial opening in the case of C. interruptus.

NOTE ON SYNONYMY.—Günther (1878:486) described C. joyneri on the basis of two specimens, 236 and 249 mm in TL, from Tokei, Japan and characterized it as having three lateral lines, the upper and the middle being separated by 13 scale rows. Norman (1925:270) described a similar species C. lighti on the basis of four specimens, 107 to 160 mm in TL, from Amoy and Wenchow and differentiated it from C. joyneri by its slender body and shorter head. Comparison of a number of specimens from Japan has clearly indicated that the differences noted by Norman are not significant to retain C. lighti as a distinct species from C. joyneri. Oshima (1927:201) and Chabanaud (1951d:270) described C. tenuis and C. tshusanensis from Tainan and Tshusan Archipelago, China, respectively. Oshima’s description was based on a single specimen, 170 mm in TL, and he characterized it as having three lateral lines, the upper and the middle being separated by 12 rows of scales, and considered it “closely related to Areliscus joyneri differing from it in having a lower body and ctenoid scales on both sides.” Cynoglossus joyneri too has ctenoid scales on both sides except scales of the head of the blind side, which are cycloid. Ochiai (1963:90) synonymized C. tenuis with C. lighti, which is a junior synonym of C. joyneri. Cynoglossus tshusanensis was described on the basis of three specimens, 81.5 to 97 mm in TL, characterized as with two nostrils, contiguous eyes, and three lateral lines on ocular side, the middle and the upper being separated by 11–12 scales. I have examined the types of C. tshusanensis in London and compared them with the types of C. joyneri; the differences noted between them were found only to be attributable to intraspecific variability and hence they are synonymized here.

TYPE SPECIMENS.—1 specimen, BMNH 1878.4.15.94, 231.5 mm SL, lectotype of C. joyneri, designated by Chabanaud (1951d:269), Jokee, Japan, coll. Joyner. 1, BMNH 1878.4.15.95, 229 mm SL, paralectotype of C. joyneri, designated by Chabanaud, obtained along with the lectotype. 1, BMNH 1924.12.15.87, 131 mm SL, lectotype of C. lighti, Amoy, China, coll. Light. 2, BMNH 1924.12.15.88–89, 131, and 169 mm SL, paralectotypes of C. lighti, collected along with the lectotype. 1, BMNH 1924.12.15.90, 117 mm SL, paralectotype of C. lighti, Wencho, China, coll. Light. 1, BMNH 1892.12.12.32, 88 mm SL, holotype of C. tshusanensis, Chusan Is., China, coll. Walker. 2, BMNH 1892.12.12.33–34, 74 and 77 mm in SL, paratype of C. tshusanensis, collected along with the holotype.

OTHER MATERIAL EXAMINED.—JAPAN: 3 specimens, USNM 6122, E coast of Japan, coll. Blake. 1. USNM 59763, Kochi, Japan, coll, H. M. Smith. 1, USNM 151796, Shizuoka, Japan. coll. D. S. Jordan, 1922. 2, KU 12545 and 12559, Yamaguchi, Japan. 2, KU 26965 and 26972, Omuta, Fukuoka Pref., Japan.

The itinus complex

Cynoglossus itinus, the only species of the itinus complex, has its center of distribution in Japan and is related to the kopsi complex, both having descended from a common ancestral stock. The principal character distinguishing this species is the absence of the posterior nostril.

14. Cynoglossus itinus (Snyder)

PLATE 7

Trulla itina Snyder, 1909:609 [type-locality: Naha, Okinawa, Japan].—Jordan, Tanaka, and Snyder, 1913:337.—Kamohara, 1952:58.—Kuroda, 1954:66.

Cynoglossus itinus.—Ochiai, 1959:200; 1963:79, pl. 17: fig. 1.

Cynoglossus punctatus Shen, 1969:21, figs. 9–19 [type-locality: Hong Kong].

DESCRIPTION.—Based on 8 specimens, 99.5–131.0 mm SL.

Depth of body 25.40–28.64 (M = 27.07), length of head 19.44–21.61 (M = 20.56) percent of standard length. Diameter of eye 10.87–15.38 (M = 13.22), interorbital space 2.08–7.14 (M = 4.35) percent of length of head. Anterior nostril on ocular side tubular, in front of lower eye, posterior nostril absent. Snout rounded, 25.0–30.43 (M = 27.24) percent of length of head, rostral hook short, not extending to vertical through the front of anterior nostril. Maxillary extending to below posterior half of fixed eye; angle of mouth extending to below vertical from middle of fixed eye, much nearer to tip of snout than to branchial opening, tip of snout to angle of mouth 36.54–45.24 (M = 40.55) angle of mouth to branchial opening 55.77–69.05 (M = 61.34) percent of length of head.

Scales: Ctenoid on ocular side including those on lateral lines; on blind side, cycloid on head and weakly ctenoid on body.

Lateral-Line System.—Three lateral lines on ocular side, dorsolateral line slightly undulated, runs backward along the dorsal contour of body, entering dorsal fin usually along 20th dorsal ray counted from the rear, midlateral line with 71–78 (M = 74) scales, 12–14 (M = 13) scales between them; ventrolateral line present. No lateral line on blind side.

Interlinear scale rows

12

13

14

Frequencies

4

3

1

Fins: Dorsal with 102–103 (M = 102) rays, anal with 83–86 (M = 84) rays, caudal 8 in 3 specimens (radiographs).

Vertebrae: 50–52, comprising abdominal and 41–43 caudal elements in 3 specimens (radiographs).

Coloration: Upper side light brown with blackish blotches, blind side yellowish in preserved specimens.

Size: Largest specimen examined, 141 (131 + 10) mm, is from Miya Aichi, Japan, KU 16057.

DISTRIBUTION.—Japan and Hong Kong.

DIAGNOSIS AND AFFINITIES.—Cynoglossus itinus has close affinity with C. interruptus and C. joyneri. It is distinguished, however, by the lack of the posterior nostril and a reduction in the number of caudal fin rays.

NOTE ON SYNONYMY.—Snyder (1909:609) described C. itinus on the basis of a single specimen, 115 mm in TL, from Naha, Okinawa, Japan and characterized it as having a single nostril and three lateral lines on ocular side, the upper and the middle being separated by 12 or 13 scale rows. Recently, Shen (1969:21) described C. punctatus from seven specimens, 110 to 136.5 mm SL, from Tolo Harbor, Hong Kong. In having three lateral lines, contiguous eyes, only one nostril, and the ctenoid nature of the scales, C. punctatus exhibits the same features as the present species.

TYPE SPECIMEN.—Holotype of C. itinus, USNM 62957, 105 mm SL, Okinawa, Japan, coll. Albatross.

OTHER MATERIAL EXAMINED.—JAPAN: 1 specimen, USNM 71610, Satsuma, coll. Bureau of Com. Fisheries. 2, USNM 72022, Satsuma. coll. Bureau of Com. Fisheries. 2, USNM 72023, Tanegashima, coll. Albatross. 1, KU 1535I, Owase, coll. Dr. T. Iwai, 15.1.1950. I, KU 16057, Miya Aichi. 1, MCZ 31166, Japan, coll. E. L. Morse.

The ogilbyi complex

The center of distribution of the ogilbyi complex is in Australia. Like the itinus complex, it is also closely related to the kopsi complex by the nature of the eyes situated close together, with a very narrow interorbital space, and the variable nature of the lateral-line system. Both C. itinus and C. ogilbyi complexes have evolved (the former in Japanese waters and the latter in the Australian waters) from a common ancestral stock that spread northward and southward from the generic evolutionary center. The most outstanding characteristics of the members are: contiguous or closely situated eyes with a narrow interorbital space, two or three (C. maculipinnis) lateral lines, the dorsolateral line extending full extent or interrupted, and large scales, the interlinear scale count being 8 or 11 to 14 and usually eight rays in caudal fin and cycloid scales on the blind side. Included in this complex are C. ogilbyi, C. maculipinnis, and C. broadhursti.

15. Cynoglossus ogilbyi Norman

Cynoglossus ogilbyi Norman, 1926:304, fig. 14 [type-locality: southern Queensland].

DESCRIPTION.—Based on the holotype of C. ogilbyi, 179.7 mm SL.

Depth of body 27.88, length of head 18.92 percent of standard length. Diameter of eye 12.65, interorbital space narrow, 2.06 percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, just in front of interorbital space. Snout rounded, 26.47 percent of length of head, rostral hook short, extending to just in front of anterior nostril. Maxillary extending beyond posterior border of fixed eye; angle of mouth extending to below vertical from posterior half of fixed eye, much nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 40.0, angle of mouth to branchial opening 58.53 percent of length of head.

Scales: Ctenoid on ocular side, cycloid on blind side.

Lateral-Line System: Two lateral lines on ocular side, dorsolateral line incomplete, extending along the dorsal contour of the body and extending the dorsal fin at 31st dorsal ray, counted from the rear, midlateral line with 66 scales and 8 scales between the middle and upper lateral lines. No lateral line on blind side.

Fins: Dorsal with 115 rays, anal with 95 rays, caudal 8 in 1 specimen (radiograph).

Vertebrae: 56, comprising 9 abdominal and 47 caudal elements in 1 specimen (radiograph).

Size: Only specimen examined, 186 (179 + 7) mm, is the holotype.

DISTRIBUTION.—Southern Queensland.

DIAGNOSIS AND AFFINITIES.—The nearest relative of C. ogilbyi is C. maculipinnis; it differs from C. maculipinnis in having larger scales (interlinear scale row count 8 cf. 10–13, M = 11) and cycloid scales on the blind side.

TYPE SPECIMENS.—Holotype of C. ogilbyi, AMS–E 2796, 179.7 mm SL, southern Queensland.

16. Cynoglossus maculipinnis Rendahl

PLATE 7

Cynoglossus maculipinnis Rendahl, 1921:17 [type-locality: northwest Australia].—Norman, 1926:302.

Cynoglossus maccullochi Norman, 1926:302, fig. 13 [type-locality: 7–10 miles northwest of Hummocky Is., east coast of Queensland].

DESCRIPTION.—Based on 11 specimens, 42.5–139.0 mm SL.

Depth of body 23.89–29.31 (M = 26.58), length of head 19.0–24.04 (M = 21.42) percent of standard length. Diameter of eye 11.90–20.00 (15.79), very narrow, 1.59–5.26 (M = 2.97) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril in anterior part of the interorbital space, or immediately in front of the eyes. Snout rounded, 28.00–35.00 (M = 31.16) percent of length of head; rostral hook short, ending in front of anterior nostril. Maxillary extending to below posterior half of fixed eye; angle of mouth extending to below vertical from middle of fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 41.46–50.00 (M = 44.75), angle of mouth to branchial opening 50.00–60.00 (M = 56.33) percent of length of head.

Scales: Moderate in size, ctenoid on both sides.

Lateral-Line System: Usually two lateral lines on ocular side, occasionally three or rarely one; dorsolateral line extends to the full extent, very rarely ending at two-thirds of body;[8] midlateral line with 64–76 (M = 70) scales, 10–13 (M = 12) scales between middle and upper lateral lines. No lateral line on blind side.

Interlinear scale rows

10

11

12

13

Frequencies

1

2

6

1

Fins: Dorsal with 102–114 (M = 107) rays, anal with 79–89 (M = 82) rays, caudal 8 (10) in 7 specimens (radiographs).

Vertebrae: 48–53, comprising 9 abdominal and 39–44 caudal elements in 7 specimens (radiographs).

Coloration: Upper side brownish, with darker patches forming six or seven irregular bands; two black dots on caudal fin; lower whitish or yellowish in preserved specimens.

Size: Largest specimen examined, 150 (139 + 11) mm, is obtained off Lindeman Island, AMS 1A 6810.

DISTRIBUTION.—Australia: Western, Northern Territory, and Queensland; recorded up to a depth of 72 fms.

DIAGNOSIS AND AFFINITIES.—Cynoglossus maculipinnis is closely allied to C. ogilbyi and C. broadhursti. The three species, forming a species-complex, seem to have evolved in Australia from a common ancestral stock. The differences between C. maculipinnis and C. ogilbyi have been outlined under C. ogilbyi; from C. broadhursti it differs in having ctenoid scales on both sides of body (C. broadhursti, like C. ogilbyi, has cycloid scales on blind side).

NOTE ON SYNONYMY.—Rendahl (1921:17) described C. maculipinnis based on a single specimen, from northwestern Australia, and characterized it with two lateral lines on the ocular side separated by 13 rows of scales, ctenoid scales on both sides of the body, two nostrils, the upper eye situated forward by a third of the eye diameter and the interorbital space less than the diameter of eyes.

Norman (1926:302) described C. maccullochi on the basis of a single specimen, 190 mm in TL, from Hummocy Island on the east coast of Queensland collected by Endeavour, and related it to C. maculipinnis; C. maccullochi, however, had larger eyes and three lateral lines on ocular side. In the British Museum there is a specimen, BMNH 1925.7.22.84, 107.5 mm SL, collected by Endeavour from the Moreton Bay on the east coast of Queensland that has only two lateral lines, the upper and the middle lines being separated by 13 rows of scales. In another specimen from Lindeman Island (QMI 15454), 110.5 mm SL, only one lateral line, the midlateral line, is present while four other specimens, QM1 15454, exhibit two lateral lines. Comparison of a number of specimens has revealed that the larger eye and an additional lower lateral line noted by Norman are attributable to intraspecific variation in the species, and C. maculipinnis, having priority over C. maccullochi, is used here as the valid name for the species.

TYPE SPECIMEN.—Holotype of C. maccullochi, AMS 2693, Hummocky Island, east coast of Queensland, coll. Endeavour, examined by Dr. John R. Paxton on my behalf.

OTHER MATERIAL EXAMINED.—1 specimen, AMS IB 3306, Repulse Bay, Queensland, 1954. 1, AMS 1A 6810, off Shaw and Lindeman Is. 1, WAM P 11729 Exmouth Gulf, W Australia, coll. R. McKay. 1, WAM P 11733, Exmouth Gulf. 1, WAM P 11799, Careening Bay, Garden Island, W Australia, coll. M. Graham, 20.1.63. 5, QM 1.15452–56, Lindeman Is. 1, MCZ 38506, Moreton Bay, S Queensland, coll. E. J. Coulter; 6.6.52. 1, USNM 174029, Port Bradshaw, Australia, N T, coll. R. R. Miller, 25.7.48. 1, BMNH 1925.7.22.84, Moreton Bay, S Queensland, coll. Endeavour. 1, BMNH 1933.8.14.24, NW Australia, coll. Gray. 2, BMNH 1933.8.12.56–57, NE of Low Island, Great Barrier Reef, coll. G. B. R. Expd.

17. Cynoglossus broadhursti Waite

FIGURE 23; PLATE 8

Cynoglossus broadhursti Waite, 1905:73, pl. 8; fig. 2 [type-locality: off Carnarvon to the northward of Houtman’s Abrolhos].—Norman, 1926:302 [mouth of Murray R.].

DESCRIPTION.—Based on 4 specimens, 183.0–229.0 mm SL.

Depth of body 26.78–29.26 (M = 27.94), length of head 17.72–20.74 (M = 19.00) percent of standard length. Diameter of eye 10.47–11.84 (M = 11.15), interorbital space 7.37–10.29 (M = 8.43) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in the anterior half of the interorbital space. Snout rounded, 26.47–34.21 (M = 30.36) percent of length of head, rostral hook short, extending to front of the anterior nostril. Maxillary extending to below posterior half of fixed eye; angle of mouth extending to below vertical from middle of fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 40.00–47.37 (M = 43.48), angle of mouth to branchial opening 52.63–55.81 (M = 54.53) percent of length of head.

Scales: Ctenoid on ocular side except those of lateral lines; scales of the blind side and those of lateral lines on ocular side cycloid.

Lateral-Line System: Two lateral lines on ocular side, dorsolateral line running backward along the dorsal contour of body and entering dorsal fin along the 6th to 14th ray, counted from the rear, midlateral line with 72–77 scales, 12–14 scales between middle and upper lateral lines. No lateral line on blind side.

Interlinear scale rows

12

13

14

Frequencies

2

1

1

Fins: Dorsal with 105–110 (M = 107) rays, anal with 83–87 (M = 85) rays, caudal 10 in 5 specimens (radiographs).

Vertebrae: 51–54 comprising 9 abdominal and 42–45 caudal elements in 5 specimens (radiograph).

Coloration: Upper side uniformly brownish, lower whitish or yellowish in preserved specimens.

DISTRIBUTION.—Western and southern Australia.

Size: The largest specimen examined, 245 (229 + 16) mm, is from the mouth of the Murray River.

DIAGNOSIS AND AFFINITIES: Cynoglossus broadhursti is readily distinguished from its close relatives, C. maculipinnis and C. ogilbyi, by a greater interlinear scale count (12–14, M = 12 cf. 8 in C. ogilbyi and 10–13, M = 11 in C. maculipinnis).

TYPE SPECIMEN.—Holotype of C. broadhursti, a specimen trawled off Carnarvon to the northward of Houtman’s Abrolhos, in Australian Museum, Sydney (not examined).

OTHER MATERIAL EXAMINED.—2 specimens, AMS 1.10360 and 1,10359, mouth of Murray River, S Australia. 2, WAM P 14739 and P 14741, Shark Bay, W. Australia, coll. W. and W. Poob Bros., 18.9.65. 1. BMNH 1925.722.83, W Australia, coll. Endeavour.

The ecaudatus complex

Cynoglossus ecaudatus and its relatives C. sinusarabici, C. dollfusi, and C. cadenati have their center of distribution in the western sector of the Indian Ocean, including the Red Sea and Gulf of Suez, the eastern coast of the Mediterranean Sea and the Senegal-Ghana coast. This complex is related to the kopsi complex and is most probably descended from a common ancestral stock.

The principal characters distinguishing this complex are the large contiguous eyes with a narrow interorbital space, one or two lateral lines, and the ctenoid scales on both sides of the body.

FIGURE 23.—Outline drawing of C. broadhursti (BMNH 1925.7.22.83) from Western Australia.

18. Cynoglossus ecaudatus Gilchrist

FIGURE 24; PLATE 8

Cynoglossus ecaudatus Gilchrist, 1908:162, pl. 46 [type-locality: off Tugela River].—Gilchrist and Thompson, 1917:398.—Thompson, 1918:128.—Regan, 1920:222 [Natal]—Bonde, 1922:25.

Areliscus ecaudatus.—Barnard, 1925:415 [Natal and Zululand coast].

Cynoglossoides ecaudatus.—Smith, 1949:165, pl. 10.

Cynoglossus kopsii [not Bleeker].—Regan, 1908:235 [Seychelles].

Areliscus natalensis Bonde, 1922:23, pl. 4; Eg. 2 [type-locality: Natal Seas, South Africa].

Cynoglossus hunteri Bonde, 1925:293 [type-locality: Delagoa Bay].—Barnard, 1925:413 [Delagoa Bay]; 1937:41.

Cynoglossus lingua [not Ham Buch.].—Smith, 1949:166 [Delagoa Bay].

Cynoglossus brachycephalus [Cynoglossus seychellensis Chabanaud (in Schedule)], 1951b:78 [type-locality: Seychelles].

Cynoglossus kopsi diagramata Chabanaud [in part], 1951d:273 [type-locality: Seychelles].

DESCRIPTION.—Based on 4 specimens, 101.5–150.0 mm SL, including the holotype of C. natalensis Bonde.

Depth of body 25.36–28.02 (M = 27.00), length of head 19.70–21.74 (M = 20.32) percent of standard length. Diameter of eye 12.50–13.33 (M = 13.05) percent of length of head, interorbital space absent. Two nostrils on ocular side, anterior nostril tubular in front of lower eye, posterior nostril simple, immediately in front of the eyes. Snout obtusely rounded, 22.50–33.33 (M = 26.31) percent of length of head; rostral hook short, ending in front of anterior nostril. Maxillary extending to below posterior half of fixed eye; angle of mouth extending to below vertical from middle of fixed eye, much nearer to tip of snout than to branchial opening, tip of snout to angle of mouth 34.78–45.00 (M = 39.95), angle of mouth to branchial opening 54.35–65.00 (M = 58.59) percent of length of head.

Scales: Ctenoid on both sides, including those on lateral lines.

Lateral-Line System: Two lateral lines on ocular side, dorsolateral line ending at a point between middle and two-thirds of the length of the body, midlateral line with 64–66 scales, 10–12 scales between middle and upper lateral line. No lateral line on blind side.

Interlinear scale rows

10

12

Frequencies

2

2

Fins: Dorsal with 108–110 rays, anal with 86–87, caudal 8 in 2 specimens (radiographs).

Vertebrae: 52–53, comprising abdominal and 43–14 caudal elements, in two examples in 2 specimens (radiographs).

Coloration: Upper side brown, with more or less distinct dark crossbands, lower whitish in preserved specimens.

Size: Largest specimen examined, 166 mm, is from Somali coast.

DISTRIBUTION.—All along East Coast of Africa and Seychelles; recorded from 26-000 fms.

DIAGNOSIS AND AFFINITIES.—Superficially and in several morphometric and meristic characters C. ecaudatus is more closely allied to C. cadenati of the Senegal-Ghana species than to C. sinusarabici or C. dollfusi. From C. cadenati it can, however, be distinguished by the fewer number of rays in the caudal fin (8 cf. 10). It is quite conceivable that these two species have descended from a common ancestral stock that spread to west Africa through the Mediterranean during comparatively recent times when marine connections between the Red Sea and the Mediterranean existed.

NOTE ON SYNONYMY.—Gilchrist (1908:162) described C. ecaudatus (spelled acaudatus) on the basis of a single specimen, about 100 mm SL obtained off Tugela River, and characterized it as having contiguous eyes, ctenoid scales on both sides, and two lateral lines on ocular side separated by 10 rows of scales. I have examined the holotype of C. ecaudatus in Cape Town and found traces of the lower lateral line along the abdominal region. Cynoglossus natalensis, described on the basis of a single specimen, 125 mm in TL from Natal and characterized as having contiguous eyes, ctenoid scales, and three lateral lines, the lower one being faintly represented just behind the operculum only for an inch, is the same species as C. ecaudatus. I have examined the holotype of C. natalensis in London and found it identical with C. ecaudatus.

Bonde (1925:293) described C. hunteri on the basis of a single specimen, 75 mm in TL, from Delagoa Bay and related it to C. lingua. The type is not traceable in the South African Museum, but from the description it does not appear to differ in any significant way from C. ecaudatus. I have, therefore, synonymized it with C. ecaudatus.

TYPE SPECIMENS.—Holotype of C. ecaudatus in South African Museum, off Tugela River. Holotype of C. natalensis, BMNH 1922.3.27.18, 116 mm SL, Natal, 29 fms, coll. S.S. Pickle.

OTHER MATERIAL EXAMINED.—1 specimen, BMNH 1908.3.23.148 (one of the paratypes of kopsi dagramata Chabanaud), Amirantes, Seychelles, coll. Gardiner. 1, BMNH 1969.5.14.401, Seychelles, coll. Wright. 1, BMNH 1904.11.4.5, S Africa, coll. J. D. F. Gilchrist, 2, SOSC Ref 145, Somali coast, 76–80 fms, 17.2.64.

19. Cynoglossus cadenati Chabanaud

PLATE 9

Cynoglossus cadenati Chabanaud, 1947a:441 [type-locality: off Senegal coast, west Africa]; 1949b:205.—Cadenat, 1960:1383 [Accra and Sierra Leone].

Cynoglossus cadenati cadenati.—Chabanaud, 1949b:206 [type-locality: Senegal].

Cynoglossus cadenati honoris Chabanaud, 1949b:206 [type-locality: coasts of Sierra Leone].

Holotype: A specimen of 145.0 mm SL, off Senegal coast, west Africa, MNHP 49–20.

DESCRIPTION.—Based on 4 specimens, 104–159 mm SL, including the holotype and the paratype of C. cadenati and also the holotype of C. cadenati honoris Chabanaud.

Depth of body 18.99–23.00 (M = 20.71), length of head 18.60–21.15 (M = 19.67) percent of standard length. Diameter of eye 13.33–16.67 (M = 14.34), interorbital space 2.38–9.09 (M = 5.99) percent of length of head. Two nostrils on ocular side, anterior nostril tubular in front of lower eye, posterior nostril simple, in the anterior half of the interorbital space. Snout rounded, 28.81–31.00 (M = 28.51) percent of length of head, rostral hook short, extending to front of anterior nostril. Maxillary extending to below posterior border of fixed eye; angle of mouth extending to below vertical from posterior half of fixed eye; angle of mouth reaching below posterior half of fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 40.48–45.83 (M = 43.31), angle of mouth to branchial opening 52.08–57.14 (M = 54.68) percent of length of head.

FIGURE 24.—Outline drawing of C. ecaudatus (BMNH 1922.3.27.18) from Natal.

Scales: Ctenoid on both sides, including those of lateral lines.

Lateral-Line System: Two lateral lines on ocular side, midlateral line with 68–72 (M = 70) scales and 11–12 scales between them. No lateral line on blind side.

Interlinear scale rows

11

12

Frequencies

2

2

Fins: Dorsal with 109–115 (M = 112) rays, anal with 87–88 (M = 87) rays, caudal (9) 10 in 3 specimens (radiographs).

Vertebrae: 52–53, comprising abdominal and 43–44 caudal elements in 3 specimens (radiographs).

Coloration: Upper side uniformly brown, lower whitish in preserved specimens.

Size: Largest specimen examined, 173 mm, is from Liberia, off St. Paul River.

DISTRIBUTION.—West Africa (Senegal to Ghana), recorded from a depth of 6–12 fms.

DIACNOSIS AND AFFINITIES.—Cynoglossus cadenati is closely related to both C. ecaudatus and C. dollfusi. In the number of midlateral scale rows, anal and dorsal fin ray counts, and the vertebral number these three species are very closely allied. Cynoglossus cadenati, however, differs from both species in higher caudal fin ray count of 10, whereas in the other species there are only 8.

The close affinity of these three species is of considerable zoogeographical significance. It is conceivable that they evolved from a common ancestral stock in comparatively recent times when a probable connection between the Red Sea and the Mediterranean existed, which zoogeographically must not be earlier than early Pleistocene.

NOTE ON SYNONYMY.—Chabanaud (1947a:441) described C. cadenati on the basis of three specimens, 106–159 mm in TL, from Senegal and Sierra Leone, west Africa and characterized it as having two lateral lines on ocular side separated by 11–12 scale rows and related it to C. canariensis. Cynoglossus cadenati honoris was rightly included in the synonymy of C. cadenati by Chabanaud (1955a:450).

TYPE SPECIMENS.—MNHP 49.20, 145 mm SL, holotype of C. cadenati, Senegal, W Africa, coll. M. J. Cadenat, 1947. 1, MNHP B 2547, 104 mm SL, paratypes of C. cadenati, collected along with the holotype. MNHP 49.21, 106.5 mm SL, holotype of C. cadenati honoris, Sierra Leone, J. Cadenat, 1947.

20. Cynoglossus dollfusi (Chabanaud)

Paraplagusia dollfusi Chabanaud, 1931:303 [type-locality: Suez Canal].

Cynoglossus dollfusi.—Gruvel and Chabanaud, 1937:8 [Suez Canal].

Trulla dollfusi.—Fowler, 1956:183.

Cynoglossus lingua [not Hamilton-Buchanan].—Gruvel and Chabanaud, 1937:10 [Suez Canal].

Cynoglossus cleopatrides Chabanaud, 1949e:146 [type-locality: Suez Canal].

DESCRIPTION.—Based on the holotype of C. cleopatrides Chabanaud, 129.0 mm SL.

Depth of body 18.99, length of head 18.60 percent of standard length. Diameter of eye 16.67, interorbital space 8.33 percent of length of head. Two nostrils on ocular side, anterior nostril in front of lower eye, posterior nostril in the anterior half of the interorbital space. Snout rounded, 27.08 percent of length of head, rostral hook rather short, ending in front of the perpendicular of the anterior border of fixed eye. Maxillary extending to below posterior half of fixed eye; angle of mouth extending to below vertical from middle of fixed eye, nearer to tip of snout than to branchial opening, tip of snout to angle of mouth 45.83, angle of mouth to branchial opening 52.08 percent of length of head.

Scales: Moderate size, ctenoid on ocular side, including those on lateral lines, weakly ctenoid on blind side.

Lateral-Line System: Two lateral lines on ocular side, midlateral line with 70 scales, 11 scales between middle and upper lateral lines. No lateral line on blind side.

Fins: Dorsal with 115 rays, anal with 85 rays, caudal 8 (radiograph).

Vertebrae: 53, comprising 9 abdominal and 44 caudal elements (radiograph).

Coloration: Upper side brownish, lower whitish or yellowish in preserved specimens.

Size: The only specimen examined is the holotype of C. cleopatrides.

DISTRIBUTION.—Suez Canal.

DIAGNOSIS AND AFFINITIES.—The nearest relative of C. dollfusi is C. cadenati; it differs from C. cadenati in having a lesser number of rays in the caudal fin.

NOTE ON SYNONYMY.—Chabanaud described C. dollfusi from the Suez Canal, basing his description on a single specimen, 33.0 mm in TL, and characterized it as having three lateral lines in the ocular side, 11 series of scales between the middle and upper lateral lines, and with ctenoid scales on both the sides. The type of C. dollfusi is not available in Paris but Gruvel and Chabanaud (1937:35, figs. 9–12) redescribed the species based on the same specimen and illustrated it. I examined the holotype of C. cleopatrides Chabanaud and found it to conform well in all respects, including the number of scales between the upper and middle lateral lines, with the description of C. dollfusi except for the absence of any trace of the ventral lateral line on the ocular side. As had been pointed out, there is considerable variation in the development of the lower lateral line among individuals of the same species of Cynoglossus (even of the same size), and the presence or absence of this line should not be depended upon for species differentiation. Chabanaud’s description of C. cleopatrides is, however, inaccurate in so far as the nature of scales on the blind side of the body is concerned—the scales on the blind side of the holotype are ctenoid and not cycloid as mentioned in the description. I have, therefore, no hesitation in synonymizing C. cleopatrides with C. dollfusi.

TYPE SPECIMENS.—MNHP 49.24, 129 mm SL, holotype of C. cleopatrides, Suez Canal, coll. Prof. R. P. Dollfus, 1928.

21. Cynoglossus sinusarabici (Chabanaud)

FIGURE 25; PLATE 9

Dollfusichthys sinusarabici Chabanaud, 1931:304 [type-locality: Suez Canal]; 1934a: 158.—Gruvel and Chabanaud, 1937:6, figs. 5–8.—Ben-Tuvia, 1953:13; 1963:115; 1966:267.

Cynoglossus sinusarabici.—Chabanaud, 1939:30; 1954:465; 1955b: 166.

Cynoglossus branchycephalus [not Bleeker].—Chabanaud, 1951b:78 [with one lateral line].

DESCRIPTION.—Based on 2 specimens, 83.0 and 99.0 mm SL, the lectotype and paralectotype of C. sinusarabici.

Depth of body 23.23–25.30 (M = 24.26), length of head 19.70–20.48 (M = 20.09) percent of standard length. Diameter of eye 15.38–17.65 (M = 16.52) percent of head, interorbital space absent. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in front of eyes. Snout rounded, 26.47–30.77 (M = 28.62) percent of length of head, rostral hook short, ends in front of anterior nostril. Maxillary extending below posterior half of fixed eye; angle of mouth extending to below vertical from middle of fixed eye, much nearer to tip of snout than to branchial opening, tip of snout to angle of mouth 43.59–47.06 (M = 45.32), angle of mouth to branchial opening 58.82–61.54 (M = 60.18), percent of length of head.

Scales: Ctenoid on both sides.

Lateral-Line System: Only midlateral line present on ocular side with 54–60 scales, 11 scales from base of dorsal to midlateral line at middle of body. No lateral line on blind side.

Fins: Dorsal with 99–101 rays, anal with 78–79 rays, caudal 8 in 2 specimens (radiograph).

Vertebrae: 48–50 comprising 9 abdominal and 39–41 caudal elements in 2 specimens (radiograph).

Coloration: Upper side uniform brown, lower whitish in preserved specimens.

FIGURE 25.—Outline drawing of C. sinusarabici (BMNH 1938.107.11) from Great Bitter Lake, Suez Canal.

Size: Largest specimen examined, 107 mm (99 mm SL) is the lectotype of C. sinusarabici.

DISTRIBUTION.—Red Sea, Suez Canal, and eastern Mediterranean (Israel); recorded from a depth of not more than 75 fms.

DIAGNOSIS AND AFFINITIES.—In C. sinusarabici only the midlateral line is present, which readily distinguishes it from the other members of the ecaudatus complex.

TYPE SPECIMENS.—Chabanaud (1931:304) described C. sinusarabici on the basis of 24 specimens, the maximum length being 134 mm, from the Gulf of Suez. 1 specimen, MNHP 1967–600a, 99.0 mm SL, which is selected here as the lectotype, agrees well with the original description of the species. Fourteen other paralectotypes, MNHP 1967–600b, are available in the Paris Museum. The whereabouts of the rest of the 9 original specimens are not known to me.

The sealarki complex

Cynoglossus sealarki, C. microphthalmus, C. zanzibarensis, and C. capensis form the sealarki complex, the characteristics of which are the absence of the posterior nostril, comparatively smaller eyes with a very narrow interorbital space, three lateral lines on ocular side, and relatively small scales on the body, the interlinear scale count being 10–11 or 14–15 or 17. Their distribution is now the central and western parts of the Indian Ocean. They seem to have descended from the same ancestral stock from which the kopsi complex of species evolved.

22. Cynoglossus sealarki Regan

FIGURE 26; PLATE 10

Cynoglossus sealarki Regan, 1908:235, pl. 26: fig. 1 [type-locality: Saya-de-Malha Bank].—Norman, 1928:195.

DESCRIPTION.—Based on 4 specimens, 164–182 mm SL, including the lectotype and the paralectotypes of C. sealarki.

Depth of body 23.08–24.39 (M = 23.50), length of head 18.45–21.67 (M = 19.99) percent of standard length. Diameter of eye 9.38–12.82 (M = 11.08) percent of length of head, interorbital space 2.56–3.23 (M = 2.90) percent. Anterior nostril of eyed side tubular, in front of lower eye, posterior nostril absent. Snout rounded, 30.77–35.48 (M = 32.87) percent of head, rostral hook very short, extending to front of anterior nostril. Maxillary extending to below middle of fixed eye; angle of mouth extending to below vertical from anterior half of fixed eye, and nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 30.77–45.16 (M = 37.92), angle of mouth to branchial opening 42.31–61.29 percent of length of head.

Scales: Ctenoid on ocular side including those of lateral lines; scales on blind side cycloid anteriorly and ctenoid posteriorly.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 64–66 scales, 10–11 scales between middle and upper lateral line in 3 specimens. No lateral line on blind side.

Interlinear scale rows

10

11

Frequencies

1

2

FIGURE 26.—Outline drawing of C. sealarki, paralectotype (BMNH 1908.3.23.154) from Saya-de-malha.

Fins: Dorsal with 112–116 (M = 114) rays, anal with 92–96 rays, caudal 10 in 2 specimens (radiograph).

Vertebrae: 57 comprising 9 abdominal and 48 caudal elements in 2 specimens (radiographs).

Coloration: Upper side uniform brown, lower whitish in preserved specimens.

Size: Largest specimen examined the lectotype of C. sealarki, is 190 mm.

DISTRIBUTION.—Saya-de-Malha Bank; recorded from a depth of over 123 fms.

DIAGNOSIS AND AFFINITIES.—Cynoglossus sealarki is closely allied to C. microphthalmus. It can, however, be distinguished by its larger scales, the interlinear scale count being 10–11, whereas C. microphthalmus has 14 scale rows between its middle and upper lateral lines.

NOTE ON SYNONYMY.—Regan (1908:235) described C. sealarki based on four specimens, 172 to 190 mm in TL, from Sayade Malha, over 123 fms. There has been no question of the identity of the species.

TYPE SPECIMENS.—From the syntype series a specimen, BMNH 1908.3.23.153, 182 mm SL, from Saya-de-Malha Bank, coll. Gardiner, is selected here as the lectotype of C. sealarki, and 3 specimens, BMNH 1908.3.23.154–156, 164–180 mm SL, collected along with the lectotype are paralectotypes.

23. Cynoglossus microphthalmus (Bonde)

FIGURE 27

Areliscus microphthalmus Bonde, 1922:24, pl. 4: fig. 3 [type-locality: Natal Seas]; 1925:292 [Delagoa Bay].

Trulla microphthalmus.—Barnard, 1925:416.

DESCRIPTION.—Based on the holotype of C. microphthalmus, 164.0 mm SL.

Depth of body 29.27, length of head 21.34 percent of standard length. Diameter of eye 11.43, interorbital space 5.71 percent of length of head. Anterior nostril on ocular side tubular, in front of lower eye, posterior nostril absent. Snout rounded, 30.00 percent of length of head, rostral hook rather short, extending to front of anterior nostril. Maxillary extending to below posterior border of fixed eye; angle of mouth extending to below vertical from posterior half of fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 44.29, angle of mouth to branchial opening 58.57 percent of length of head.

Scales: Ctenoid on ocular side, including those of lateral lines; scales on blind side cycloid anteriorly and weakly ctenoid posteriorly.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 79 scales, 14 scales between middle and upper lateral lines, ventrolateral line slightly undulated. No lateral line on blind side.

Fins: Dorsal with 108 rays, anal with 86 rays, caudal 10.

Vertebrae: (Not counted).

Coloration: Upper side light brown, lower whitish in preserved specimens.

Size: The only specimen examined, 174.5 mm, is the holotype of C. microphthalmus.

DISTRIBUTION.—Natal, South Africa; recorded from a depth of 29 fms.

DIAGNOSIS AND AFFINITIES.—Cynoglossus microphthalmus is closely allied to C. sealarki, but it can be easily distinguished by its wider interorbital space (5.71 percent of length of head cf. 2.90 percent).

FIGURE 27.—Outline drawing of C. microphthalmus, holotype (BMNH 1922.3.27.17) from Natal.

TYPE SPECIMENS.—Holotype of C. microphthalmus, BMNH 1922.3.27.27, 164 mm SL, Natal, coll. Gilchrist.

24. Cynoglossus zanzibarensis Norman

FIGURE 28; PLATE 10

Cynoglossus (Trulla) zanzibarensis Norman, 1939:105, fig. 36 [type-locality: Zanzibar, 183–293 m].—Nielsen. 1961:226 [off Durban, 430–595 m]; 1964:132 [off Durban, 230 m].

DESCRIPTION.—Based on 15 specimens, 49.0–172.0 mm SL, including the lectotype and paralectotype of C. zanzibarensis.

Depth of body 21.78–28.19 (M = 25.60), length of head 20.72–24.10 (M = 21.98) percent of standard length. Diameter of eye 8.82–13.33 (M = 11.28), interorbital space absent or narrow, 0.31–4.76 (M = 2.75) percent of length of head. Anterior nostril on ocular side tubular, in front of lower eye, posterior nostril absent. Snout rounded, 27.27–35.0 (M = 32.55) percent of length of head; rostral hook very short, extending to front of anterior nostril. Maxillary extending to below posterior half of fixed eye; angle of mouth extending to below vertical from middle of fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 37.33–47.06 (M = 41.93), angle of mouth to branchial opening 53.85–64.71 (M = 58.15) percent of length of head.

Scales: Ctenoid on both sides, those of head on blind side rather weakly ctenoid.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 72–76 scales, 13–15 scales between them. No lateral line on blind side.

Interlinear scale rows

13

14

15

Frequencies

2

4

4

Fins: Dorsal with 116–121 (M = 119) rays, anal with 94–99 (M = 96) rays, caudal 10 in 6 specimens (radiographs).

Vertebrae: 51–58, comprising 9 abdominal and 42–49 caudal elements in 6 specimens (radiographs).

FIGURE 28.—C. zanzibarensis, paralectotype, (BMNH 1939.5.24.1810) from Zanzibar area: a, outline drawing of lateral view; b, details of pelvic fin; pelvic fin of eyed side persists as rudimentary structure.

Coloration: Upper side brownish, lower whitish in preserved specimens.

Size: Largest specimen examined, 185 mm, is from the Arabian Sea, lat. 21°23′N, long. 69°46′E.

DISTRIBUTION.—Durban through Zanzibar to Kenya.

DIAGNOSIS AND AFFINITIES.—Cynoglossus zanzibarensis is closely related to C. capensis, especially in the position of the eyes, which are close together leaving a very narrow or no interorbital space. From C. capensis it is readily differentiated by the ctenoid scales on both sides of its body.

NOTE ON SYNONYMY.—Originally described on the basis of five specimens, 130–177 mm in TL, collected off Zanzibar by John Murray Expedition. Cynoglossus zanzibarensis is well diagnosed and there has been no confusion with regard to its identity.

TYPE SPECIMENS.—A specimen, BMNH 1939.5.24.–1813, 149 mm SL, from Zanzibar, which is an excellent example of the species, is selected here as the lectotype of C. zanzibarensis and four specimens, BMNH 1939.5.24.1810–12 and 14, 120–169 mm SL are paralectotypes.

OTHER MATERIAL EXAMINED.—3 specimens, SOSC Ref 170, Kenya coast, lat. 02°56′S, long. 40°28′E. coll. Anton Bruun. 1, SOSC Ref 23, Kenya coast, lat 20°50′S, long. 40°31′E, coll. Anton Brunn. 2, SOSC Ref 170, Mozambique coast, lat. 25°12′S, long. 34°04′E, coll. Anton Bruun. 5. SOSC Ref 170, Mozambique coast, coll. Anton Bruun.

25. Cynoglossus capensis (Kaup)

PLATE 11

Trulla capensis Kaup, 1858:109 [type-locality: Cape of Good Hope].—Thompson, 1918:128.—Bonde, 1925:292 [Delagoa Bay].—Barnard, 1925:416.—Smith, 1949:166, pl. 2: fig. 342.

Plagusia capensis.—Castelnau, 1861:71.

Cynoglossus capensis.—Günther, 1862:505.—Boulenger, 1902: 4.—Nielsen, 1964:133 [Cape Barracouda, Agulhas Bank]

Areliscus capensis.—Bonde, 1922:24.

DESCRIPTION.—Based on 6 specimens, 87.0–293.0 mm SL.

Depth of body 23.56–43.70 (M = 29.21), length of head 18.09–34.03 (M = 21.68) percent of standard length. Diameter of eye 10.71–12.90 (M = 11.54), interorbital space absent or very narrow, 1.79–1.89 (M = 11.84) percent of length of head. Anterior nostril on ocular side, in front of lower eye, posterior nostril absent. Snout rounded, 28.40–35.85 (M = 32.14) percent of length of head, rostral hook very short, ends well in front of anterior nostril. Maxillary extending to below posterior half of fixed eye; angle of mouth reaching below vertical from middle of fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 37.14 46.77 (M = 43.20), angle of mouth to branchial opening 56.79–62.50 (M = 59.65) percent of length of head.

Scales: Ctenoid on ocular side; scales of blind side cycloid anteriorly, weakly ctenoid posteriorly.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 98–104 scales, 15–17 scales between middle and upper lateral lines. No lateral line on blind side.

Interlinear scale rows

15

16

17

Frequencies

1

-

2

Fins: Dorsal with 108–110 (M = 109) rays, anal with 85–86 (M = 85) rays, caudal 10 in 3 specimens (radiographs).

Vertebrae: 50–52 comprising 9 abdominal and 41–43 caudal elements, in 3 specimens (radiographs).

Coloration: Upper uniformly brown, lower whitish in preserved specimens.

Size: Largest specimen examined, 314 (293 + 21) mm, is from False Bay, South Africa.

DISTRIBUTION.—South Africa (from Saldanha Bay to Natal) recorded from a depth of 10–60 fms.

DIAGNOSIS AND AFFINITIES.—-Superficially and in many morphometric characters C. capensis resembles C. zanzibarensis. It is distinguished, however, by its deeper body, the cycloid nature of the scales of the anterior part of the blind side, and 15 to 17 scale rows between its middle and upper lateral lines.

TYPE SPECIMENS.—Kaup’s (1858:108) brief description of C. capensis from the Cape of Good Hope was based on a single specimen without indication of its size. Kaup apparently did not retain the specimen on which his description was based and I have found no evidence that it is extant.

OTHER MATERIAL EXAMINED.—1 specimen, BMNH 1897.10.18.1, False Bay, coll. Gilchrist. 1, BMNH 1891.9.3.2, Algoa Bay, coll. Leslie. 1, BMNH 1904.11.4.4, Cape Point. coll. Gilchrist. 1, BMNH 1922.5.27.22, Natal. Gilchrist. 2, MCZ 11184, Cape of Good Hope, coll. Sayard.

The arel group

This group is more highly specialized for a burrowing habit than the previous groups and is typified by relatively larger adult size, more elongate body, total absence of any lateral-line system on blind side, 10 rays in caudal fin, two lateral lines on ocular side, relatively small eyes separated by a narrow interorbital space, two nostrils on ocular side, somewhat obtusely pointed long snout with angle of mouth situated nearer to branchial opening than to tip of snout, and large scales, ctenoid on ocular side and cycloid on blind side. The obtusely pointed snout with the consequent placing of the angle of mouth nearer to branchial openings, more elongate body, and smaller eyes are further specializations toward a burrowing mode of life.

Included in this group is the arel complex consisting of C. arel, C. robustus, and C. lingua; C. arel with an interlinear scale formula of seven to nine scales being closest to the evolutionary stem of this group. Their combined range covers the whole of the Malay Archipelago extending north to Japan and west to India, Pakistan, and the Persian Gulf. This group, which has certain similarities with the canariensis and bilineatus complexes, appears to have evolved in the main generic evolutionary center as an early offshoot from the stock that gave rise to the canariensis group.

The arel complex

Cynoglossus arel, C. robustus, and C. lingua form the arel complex, which is the only complex within the arel group. The characteristics of the complex are, therefore, the same as given above for the group.

26. Cynoglossus arel (Schneider)

FIGURE 29; PLATE 11

Pleuronectes arel Schneider, 1801:159 [type-locality: Tranquebar, east coast of Madras].

Cynoglossus arel.—Norman, 1928:201.—De Silva, 1956:199 [Palk Bay, Ceylon].—Saramma, 1963:76 [Kerala coast].

Cynoglossus melampetala Richardson, 1846:281 [China].—Whitehead, 1969:218, pl. 29a.

Cynoglossus melampetalus.—Günther, 1862:496.—Bleeker, 1873:131 [Canton].—Günther, 1880:55 [Hong Kong].—Sauvage, 1881:107 [Swatow].—Wu, 1932:148.—Fowler, 1934b:221. —Chu, 1963:540, fig. 406.—Shen, 1967:216.

Plagusia grandisquamis Cantor, 1850:1214 [type-locality: seas of Penang].

Trulla grandisquamis.—Kaup, 1858:109.

Cynoglossus grandisquamis.—Günther, 1862:503.—Duncker, 1904:169.—Weber and de Beaufort, 1929:208.

Plagusia potous [not potous Cuvier].—Cantor, 1850:1217 [type-locality: seas of Malay Peninsula and islands].

Plagusia macrolepidota Bleeker, 1851a:415 [type-locality: Batavia]; 1852:25.

Arelia macrolepidota.—Bleeker, 1859:184.

Cynoglossus macrolepidolus.—Günther, 1862:496.—Bleeker, 1875:34, pl. 242: fig. 2.—Day, 1877:434, pl. 96: fig. 3; 1889:455.—Alcock, 1889:288.—Rutter. 1897:89.—Seale, 1910:288.—Jenkins, 1910a:30.—Norman, 1928:202, fig. 18.—Weber and de Beaufort, 1929:205.—Herre, 1933:5 [Sandakan].—Fowler, 1934b:219; 1937:87.—Okada and Matsubara, 1938:437 [Formosa, Java. Banka].—Herre, 1941:392 [Andaman Is.].—Suvatti, 1950:327.—Herre, 1953:190.—Munro, 1955:265, pl. 51: fig. 770.—Fowler, 1956:186, fig. 101.—De Silva, 1956:197.—Scott, 1959:43.—Kuronuma, 1961:32.—Saramma, 1963:76.—Punpoka, 1964:64.—Pradhan, 1964:458. —Chen and Weng, 1965:95, fig. 66.—Shen, 1967:215.

Plagusia cantoris Bleeker, 1853a: 153 [“Hindustan and Archipelagus, Indicum” based on 2 stuffed specimen] of Cantor’s P. potus from Singapore].—Günther, 1862:502.—Bleeker, 1875:33.

Plagusia oligolepis Bleeker, 1854b:445.

Arelio olegolepis.—Bleeker, 1859:185.

Cynoglossus oligolepis.—Günther, 1862:496.—Bleeker, 1875:34, pl. 242: fig. 3.—Steindachner, 1867:587 [Ning-Pou].—Bleeker, 1873:134 [Ning Pou].—Day, 1877:433, pl. 95: fig. 4; 1889:455.—Alcock, 1887:280.—Johnstone, 1904:209.—Weber, 1913b:441.

Cantoria pinangenensis Kaup, 1858:106 [based on Plagusia cantoris Bleeker].

Arelia kaupii Bleeker, 1860a:73.

Cynoglossus kaupii.—Günther, 1862:497.—Bleeker, 1875:32, pl. 244: fig. 4.—Weber and de Beaufort, 1929:196.

Cynoglossus elongatus Günther, 1862:501 [type-locality: East Indian seas].—Bleeker, 1875:34.

DESCRIPTION.—Based on 26 specimens, 150.0–330.0 mm SL, including the holotype of C. macrolepidotus and C. oligolepis.

Depth of body 19.94–25.81 (M = 22.73), length of head 19.69–28.39 (M = 23.99) percent of standard length. Diameter of eye 6.61–10.85 (M = 8.48), interorbital width 1.75–5.21 (M = 3.43) percent of length of head. Two nostrils on eyed side, the anterior one tubular in front of lower eye, posterior simple in the anterior half of the interorbital space. Snout obtusely pointed, 20.66–41.89 (M = 35.87) percent of length of head, rostral hook short, extending to front of the anterior nostril. Maxillary extending to beyond the fixed eye; angle of mouth extending to below vertical from hind border of fixed eye or little beyond, more or less midway between tip of snout and branchial opening; tip of snout to angle of mouth 46.25–55.10 (M = 50.71), angle of mouth to branchial opening 46.49–53.49 (M = 49.33) percent of length of head.

FIGURE 29.—Outline drawing of C. arel (BMNH 1848.3.16.193) from Chinese seas.

Scales: Ctenoid on ocular side, including scales on lateral line, those on head rather weakly serrated; scales on blind side cycloid.

Lateral-Line System: Two lateral lines on eyed side, median lateral line with 56–70 scales, 7–9 scales between them. No lateral line on blind side.

Interlinear scale rows

7

8

9

Frequencies

20

43

10

Fins: Dorsal with 116–130 (M=125) rays, anal with 85–98 (M = 95) rays, caudal 10 in 42 specimens (radiographs).

Vertebrae: 50–57 comprising 9 abdominal and 41–48 caudal elements in 42 specimens (radiographs).

Coloration: Upper side more or less uniformly brownish, lower whitish in preserved material.

Size: Largest specimen examined, 365.0 mm SL, from Madras, India.

DISTRIBUTION.—From Malay Archipelago, through seas of India to Persian Gulf and through South China Sea to Philippines and Taiwan; recorded from a depth of 5–45 fms.

DIAGNOSIS AND AFFINITIES.—Cynoglossus arel is closely related to both C. lingua and C. robustus. It is distinguished by the lower number of interlinear and midlateral scales, anal and dorsal rays, and vertebrae than the other two species. Cynoglossus arel appears to be less specialized than C. robustus for a burrowing mode of life in that it has a shorter snout (mean length 35.87 percent of length of head cf. 39.36 percent) and larger eyes (mean diameter of eye 8.48 percent of length of head cf. 7.84 percent).

NOTE ON SYNONYMY.—Schneider’s (1801:159) description of P. arel is not quite adequate to distinguish it from most other species of Cynoglossus. He described C. arel on the basis of four dried specimens from Tranquebar on the east coast of Madras, India, neither giving any illustration of the species nor mentioning the size of his specimens. In the original description, the number of scale rows between the upper and middle lateral lines was not indicated, which in fact had created the confusion in the identity of the species. Richardson (1846:281) described C. melampetala from China, based on John Reeve’s collections of Chinese drawings; Cantor (1850:1214) described Plagusia grandisquamis on the basis of a specimen from Penang; Bleeker (1851a:415) described P. macrolepidota from Batavia, and Bleeker (1860a:73) described Arelia kaupii from Sumatra. Bleeker in his Atlas (1875:34, pl. 242: fig. 2) redescribed C. macrolepidotus and illustrated it. His description and illustration were so good that subsequent workers identified this common and widely distributed Indo-West Pacific species with C. macrolepidotus, not suspecting that the earlier name arel was its senior synonym. Bleeker (1853a: 153), based on two stuffed specimens of Cantor’s Plagusia potous, 217 and 322 mm SL, from Singapore, described another species P. cantoris, which he differentiated from all other known species on the basis of both nostrils being placed above the upper lip in front of the lower eye. I have examined the types of P. cantoris; even though varnished over, the position of the nostrils cannot be detected. Likewise, Cantor’s P. grandisquamis, which is differentiated by only one nostril in front of the lower eye, the absence of the narial openings between the eyes, and two lateral lines on ocular side separated by six scale rows, is also represented in the British Museum by a stuffed specimen. I have examined it and though the presence of the nostrils in the varnished skin is not discernible, an interlinear count of seven scales can be determined, a distinctive characteristic feature of C. arel.

While describing P. oligolepis and A. kaupii, Bleeker did not compare them with any other species. From his description it would appear that he considered P. oligolepis different from C. macrolepidotus on the basis of a narrower interorbital space, the situation of the angle of the mouth being somewhat nearer to the gill opening than to the tip of mouth, and a slightly greater depth of the body. Cynoglossus kaupii, described on the basis of a single specimen, was differentiated both in its original description and in Bleeker’s Atlas from all other species by two lateral lines on both sides. Günther (1862) considered C. macrolepidotus, C. oligolepis, and C. kaupii as distinct species, but about C. kaupii he remarked that “Pleuronectes arel Bl. Schn. p. 159, or Arelia Schneider Kaup, l.c., appears to be closely related to this species.” He described another species, C. elongatus, based on a specimen of Cantor’s Plagusia potous from Penang, and characterized it as a somewhat elongated fish with the depth of the body being “six times and two-thirds in the total length.” I have not been able to locate Cantor’s stuffed specimen that formed the basis for Günther’s C. elongatus, but from the description, “two lateral lines on the left side, separated by about eight longitudinal series of scales at their point of greatest distance,” the identity of the species is unmistakable and is readily referable to C. arel.

Sixty-one years after the original description of C. arel, Norman (1928:201) examined the type of C. arel from the Berlin Museum and resurrected the species. He further synonymized C. oligolepis with C. arel but somehow retained C. macrolepidotus as a separate species, differentiating it from C. arel by its somewhat deeper body. I have examined a large number of specimens of various sizes including specimens from Madras, the type-locality of C. arel, and compared them with the specimens labeled as C. macrolepidotus in the British Museum, including a specimen from Bleeker’s collection (BMNH 1862.6.3.8), and I have come to the definite conclusion that the differences noted by Norman in the proportional measurements are attributable to intraspecific variation and that they are conspecific. Cynoglossus kaupii, from the original description as well as from Bleeker’s excellent illustration, appears to exhibit no significant difference from C. arel; eight or nine scales between the lateral lines on the left side fairly well confirm the identity of the species. Plagusia melampetalus Richardson (1846) is synonymized with C. arel, because from the characterization of the species in the original description, especially the indication that the two lateral lines on the left side are separated by seven series of scales, the identity of the species is unmistakable.

TYPE SPECIMENS.—Holotype of P. arel, ZMB 2431, 207 mm SL, 221 mm TL, Tranquebar, east coast of Madras. (Dr. C. Karrer kindly examined the type in the Zoological Museum, Berlin and gave the necessary details).

Bleeker’s description of P. macrolepidota was based on 7 specimens, 155–240 mm in TL, from Batavia. In his Atlas (1875:34, pl. 242: fig. 2) he redescribed and illustrated the species based on 17 specimens, 155–240 mm in TL, and illustrated a specimen of 240 mm in TL. Among the Bleeker collection in Leiden there are 6 specimens, cataloged as RMNH 6785 (pers. comm., Dr. M. Boeseman). The specimen, 218 mm SL (239 mm TL), that formed the basis for Bleeker’s illustration and has already been indicated as such by a label in the bottle by Chabanaud in 1946 is selected here as the lectotype. RMNH 6785 is now restricted to the lectotype and the rest of the 5 specimens, 134–190 mm SL (146–206 mm TL), are paralectotypes and have been recataloged as RMNH 26209 (Dr. M. Boeseman examined the types on my behalf and selected the paralectotypes).

Bleeker’s description of P. oligolepis was based on one specimen, 365 mm in TL, from Batavia. Among the specimens in the Bleeker collection in Leiden, there are two specimens cataloged as RMNH 6786 (pers. comm., Dr. M. Boeseman). A specimen measuring 338 mm SL (365 mm TL) is considered to be the holotype of P. oligolepis and is retained as RMNH 6786, the other specimen, 272 mm SL (293 mm TL), having been removed.

Bleeker’s description of A. kaupii was based on one specimen, 255 mm in TL, from Benkulen, Sumatra. Among the Bleeker collection in Leiden there is a specimen, 232 mm SL (248 mm TL), coll. J. A. W. Van Ophuysen, 1858, cataloged as RMNH 6783 (pers. comm., Dr. M. Boeseman) and it is the holotype of A. kaupii.

OTHER MATERIAL EXAMINED.—CHINA: 1 specimen, BMNH 1848.3.16.198, China Sea, coll. Vice Admiral E. Belcher. 2, BMNH 1879.5.14.79–80, Hong Kong, coll. Challenger. 1. BMNH 1924.12.15.82, Santuas, China, coll. Light. 4, BMNH 1924.12.15.83–86, Amoy, coll. Light. 1, BMNH 1955.5.18.6, S China, coll. Lin. 1, USNM 6511, China, coll. Stempson. 3, USNM 36895, Hong Kong, coll. W. Stempson. 1, USNM 56430, China, coll. Jony. 1, USNM 137951, Hong Kong Mkt., coll. Albatross. 3, USNM (unregistered), Hong Kong, Fisheries Research Sta, Hong Kong. 1, MCZ 33194, Hong Kong. 1, ANSP 76713, Tai Po, China, coll. G. C. Herklots. 1, ANSP 77399, Hong Kong, China, coll. G. C. Herklots.

INDONESIA: 1, BMNH 1862.5.3.2, Batavia, coll. P. Bleeker. 1, BMNH 1931.4.23.48, Batavia Mkt., coll. Hardenberg. 1, BMNH 191.4.23.49, Cheriban, Java. coll. Hardenberg. 1, BMNH 191.4.23.50, Kelampis. Madora, coll. Hardenberg. 1, USNM 72749, Java, coll. B. Palmer. 4, UMMZ 154921 (OR.274495), Batavia, coll. Hubbs and Hardenberg. 1, MCZ OR.274867, Java, Surabaya, coll. Hubbs and Palmer. 1, MCZ OR.274867, Batavia. 1, NHV OR.276012, Padang, coll. Dr. K. Paul. 1, UZMK OR.275455, lat. 5°56′S, long. 106°34′E, coll. Th. Mortensen. 2, UZMK (unregistered) Lampong Bay, coll. Th. Mortensen. 1, UZMK (unregistered), lat. 6°22′S, long. 105°44′E, coll. Th. Mortensen, 26.752. I, UZMK (unregistered), Bantam Bay (Sta 105), coll. Th. Mortensen, 5.8.22.

THAILAND: 2, UZMK (unregistered). Gulf of Thailand, lat. 6°57′N, long. 99°23′E, and lat. 7°00′N, long. 99°21′E, 30–26 m, coll. BM-Thai-Danish Expd., 10.2.66. 5, UZMK (unregistered), Gulf of Thailand, Jan–Feb 1966. 1, UZMK (unregistered), Gulf of Thailand. 4, ANSP 76816. Thailand, coll. R. M. Schauensee. 1. ANSP 87212, Bangkok, coll. R. M. Schauensee. 3, CAS (GVF), lat. 11°59′24″N, long. 102°11′06″E, coll. Naga Expd. 1, CAS (GVF), lat. 13°90′N, long. 100°45′E, coll. Naga Expd. 1, CAS (GVF), lat. 10°26′13.5″N, long. 99°15′27″E, coll. Naga Expd., 18–5–60. 2, GAS (GVF), lat. 12°39′25″N, long. 100°15′45″E, coll. Naga Expd., 13–12–60. 1, GAS (GVF), Gulf of Thailand, lat. 11°49′N, long. 94°49′E, coll. Thai fishermen, 2.1.1960. 4. CAS (GVF), Gulf of Thailand, coll. Naga Expd., 22.4.1960. 11, CAS (GVF), lat. 13°05′50″N, long. 100°26′10″E, coll. Naga Expd., 13.12.1960. 1, CAS (GVF), lat. 13°05′50″N, long. 100°26′10″E, coll. Naga Expd., 13.12.1960. 2, CAS (GVF). lat. 11°40′N, long. 100°39′E and lat. 11°51′N, long 100°39′E. coll. Thai fishermen, 10.1.1961.

SINGAPORE: 8, MCZ 332208, Singapore, coll. Dr. G. Mead. 1, NHV OR.276012, Singapore, coll. Dr. K. Paul. 1, BMNH 19337.21.27, Singapore, ex. Raffles Mus.

BURMA: 1, BMNH 1928.3.20.96. Gulf of Martaban, ex. Indian Museum. 1, , Gulf of Martaban. coll. Marine Survey. 1, , Mergui Mkt.

INDIA: 1, BMNH 1888.11.6.45, E coast of Madras, coll. Thurshton. 1, BMNH 1867.5.30.12, Madras, coll. F. Day. 1, BMNH 1869–5–30.12, Madras, coll. F. Day. 2, BMNH 1889.2.1.4058, 59, Madras, coll. F. Day. 1, BMNH 1928.3.20.92–91. Orissa coast ex. Indian Museum. 2, BMNH I928.S.20.93–94, R. Hooghly, ex. Indian Museum. 1, BMNH 1928.3.20.95, Andamans, ex. Indian Museum. 1, BMNH 1928J.20.97, R. Hooghly, ex. Indian Museum. 1, BMNH 1928.3.20.98, R. Hooghly, ex. Indian Museum. 1, ZSI 1143 (original of Day’s pl. 96: fig. S), Madras, coll. F. Day. 1, ZSI 1190, Madras, coll. F. Day. 1, ZSI 1458 (original of Day’s pl. 95: fig. 4), Madras, coll, F. Day. 1, ZSI 2716 (original of Day’s pl. 90: fig. 5), Madras, coll. F. Day. 1, ZSI 11588, Sandheads, R. Hooghly, coll. R. M. Daley. 4, ZSI 12111–4. Orissa coast, coll. Marine Survey. 2, ZSI 12215, Orissa coast, 5 mi S of False Pt., 7 fms, coll. Marine Survey. 1, ZSI 12126, Orissa coast, coll. Marine Survey. 1, ZSI , Orissa coast, coll. Bengal Fisheries Golden Crown. 2 ZSI , Keechankuppan, 3 mi S of Nagapatnam, coll. A. G. K. Menon, 8.2.57. 1, ZSI , Puri coast, coll. N. Annandale. 1, ZSI , locality unknown, coll. Bengal Fisheries Golden Crown. 3, , locality not known, coll. Bengal Fisheries Golden Crown. 3, ZSI , locality not known, coll. Bengal Fisheries Golden Crown. 1, ZSI , Veerampatnam, 3 mi S of Pondicherry, coll. A. G. K. Menon, 22.12.56. 1, ZSI , Sonakuppam Village, Cuddalore, coll, A. G. K. Menon. Jan 57. 1, ZSI , Pondicherry Mkt., coll. A. G. K. Menon, 25.12.1956. 1, ZSI . Tranquebar coast, Tanjore Dt., Madras, coll. A. G. K. Menon, 29.137. 1. ZSI F 1772, Alibagh. Colaba Dt.. Maharastra 29.137. 1, ZSI , Alibagh, Colaba Dt., Maharastra State, coll. K. K. Tiwari, 24.1155. 33, SOSC Ace. 4, lat. 14°52′N, long. 96°39′E, Sta 39a. coll. Anton Bruun, 51.3.63. 127, SOSC Ace. 4, lat. 15°04′N, long. 95°51′E, Sta 41, coll. Anton Bruun 31.3.63. 1, SOSC Ace. 4, lat. 15°20′N. long. 96°24′E, coll. Anton Bruun, 31.3.63. 6, SOSC Ace. 4, lat. 15°08′N, long. 94°54′E, Sta 42, coll. Anton Bruun, 1.4.63. 3, SOSC Ace. 4. lat. 21°52′N, long. 91°36′E. Sta 44, coll. Anton Bruun, 4.4.63. 5, SOSC Ace. 4, lat. 19°50′N, long. 92°55′E. coll. Anton Bruun, 5.4.63. 4, SOSC Ace. 4, lat. 19°41′N, long. 93°08′E, coll. Anton Bruun, 5.4.63. 1, SOSC Ace. 23, lat. 20°22′N, long. ll°47′E, coll. Anton Bruun, 15.11.63 129, SOSC Ace. 23, lat. 20°20′N, long. 70°50′E, 98 fans. coll. Anton Bruun, 15.11.63. 1, SOSC Ace. 23, lat. 21°23′N, long. 69°46′E, Sta 211 A, coll. Anton Bruun, 16.11.63. 1, SOSC Ace 23, lat. 22°03′N, long. 68°19′E, coll. Anton Bruun, 18.11.63. 8, SOSC Ace 23, lat. 22°21′N, long. 68°42′E, Sta 217A, 14 fms, coll. Anton Bruun, 18.11.63. 5, SOSC Ace. 23, lat. 22°45′N, long. 68°24′E, 14 fms, coll. Anton Bruun, 18.11.63. 1, SOSC Ace. 23, lat. 23°16′N, long. 67°48°E, 12 fms, Sta 225A, coll. Anton Bruun, 19.11.63. SOSC Ace 23, lat. 23°00′N, long. 68°36′E, coll. Anton Bruun, 19.11.63. 2, SOSC Ace 4, lat. 14°52′N, long. 96°39′E, coll. Anton Bruun, 31.11.6S. 1. SOSC Ace. 4, lat. 14°52′N. long. 96°24′E, Sta 39A., coll. Anton Bruun, 31.11.63. 1, SOSC Ace. 23, lat. 21°28′N, long. 59°28′E, coll. Anton Bruun, 4.12.63. 2, SOSC Ace. 23, Royapuram Beach, Madras, lat. 13°07′N, long. 80°20′E, coll. Anton Bruun, 13.9.66. 1, SOSC Ace 23, Ennor fish landing, Madras, lat. 13°13′N, long. 80°25′E, coll. Anton Bruun, 14.9.66. 5, SOSC. Ref 334, Porto Novo, Madras, lat. 11°30′N, long. 79°50′E, 12 fms, coll. Anton Bruun, 21.9.66. 2, SOSC, Porto Novo, Madras, lat. 11°32′N, long. 79°53′E, coll. Anton Bruun. 1, SOSC, Pondicherry, lat. 11°55′N, long. 79°53′E, coll. Anton Bruun. 1, specimen, SOSC, Veerampatnam, Pondicherry, lat. 11°52′N, long. 39°54′E, coll. Anton Bruun. 1, SOSC Ace. 23. Palk Strait, Madras, lat. 09°20′N, long. 79° 10′E, coll. Anton Bruun, 29.9.66. 2, SOSC Acc. 23, Mandapam Camp, Tamil Nadu, lat. 09°25′N, long. 79°10′E, coll. Anton Bruun, 29.9.66. 3, SOSC Ref. 334, lat. 08°39′N, long. 78°15′E, coll. Anton Bruun, 1.10.66. 1, SOSC, Porto Novo, Madras, coll. Anton Bruun, 2.10.66. 1, SOSC Ref. 381, Porto Novo, Madras, coll. Anton Bruun, 9.10.66. 1. SOSC, Madras, coll. T. H. Berry. 4, UZMK (unregistered), Ceylon and Calcutta, lat. 20°51′N, long. 87°58′E, coll. Th. Mortensen, 26.7.51. 2, UZMK (unregistered), Ceylon and Calcutta, lat. 20°51′N, long. 87°58′E, coll. Galathea Expd., 26.4.65. 3, UZMK (unregistered), Bombay, lat. 18°48′N, long. 72°37′E, 20–30 m, coll. Galathea Expd., 12.5.64. 1, ANSP 77146, Bombay, coll. F. F. Hallberg. 1, ANSP 77546, Bombay. coll. F. F. Hallberg. 1, ANSP 77520, Bombay, coll. F. Hallberg. 1, ANSP 88356, Bombay, coll. H. W. Fowler.

PAKISTAN: 1, BMNH 1882:2.1.4060, Sind, coll. F. Day.

PERSIAN GULF: 10, BMNH 1911.2.2358–67, Persian Gulf, coll. Tounsend. 2, BMNH 1928.3.20.89–90, N end of Persian Guf, ex. Indian Museum.

27. Cynoglossus robustus Günther

FIGURE 30; PLATE 12

Cynoglossus robustus Günther, 1873a:243 [type-locality: Shanghai].—Steindachner, 1896:219 [Japan].—Jordan and Snyder, 1901:123.—Jordan and Starks, 1906a:239 [Japan, China].—Fowler and Bean, 1922:68 [Tokyo]. Jordan and Hubbs, 1925:302 [Kobe].—Fowler, 1930:616 [Hong Kong].— Wu, 1931:169 [Chi-Pou].—Chu, 1931:95 [Shanghai, Hong Kong].—Wu, 1932:147 [Tehou-San].—Wu and Wang, 1933:304 [Amoy].—Fowler, 1934b:221 [China].—Okada and Matsubara, 1938:437 [Chinese sea].—Mori. 1952:183 [Quelpar Is.].—Kamohara, 1952:86 [Tosa].—Matsubara, 1955:1285 [S Japan, S China Sea].—Tchang, 1955:297. fig. 183.—Chen, 1956:106 [Kaohsiung].—Ochiai, 1959:213.—Chu, 1963:539. fig. 405.—Chen and Weng, 1965:96, fig. 67 [Kulung].—Shen, 1967:213, figs. 130–133 [Kowloon].

Cynoglossus brunneus Regan, 1905a:26 [inland Sea of Japan]. —Jordan and Starks, 1906a:239 [Inland Sea of Japan].—Jordan, Tanaka and Snyder, 1913:336 [listed].

Cynoglossus inusita Jordan, Tanaka, and Snyder, 1913:335 [type-locality: Tokyo, Nagasaki].—Hubbs, 1915:494 [Kobe].

DESCRIPTION.—Based on 16 specimens, 100.0–388.0 mm SL, including the holotype of C. robustus.

Depth of body 21.03–29.25 (M = 25.09), length of head 20.16–24.46 (M = 22.46) percent of standard length. Diameter of eye 6.52–9.88 (M = 7.84), interorbital width 3.70–7.64 (M = 5.37) percent of length of head. Anterior nostril tubular, in front of lower eye, posterior nostril simple, in the anterior half of the interorbital space. Snout obtusely pointed 33.58–44.83 (M = 39.36) percent of length of head, rostral hook short, extending only to front of anterior nostril. Maxillary extending to beyond fixed eye; angle of mouth extending to just vertical from below posterior border of fixed eye, nearer to branchial opening than to tip of snout; tip of snout to angle of mouth 48.91–56.32 (M = 53.64) angle of mouth to branchial opening 45.00–57.94 (M = 47.99) percent of length of head.

Scales: Ctenoid on ocular side with the lateral-line scales cycloid anteriorly, ctenoid posteriorly; scales on blind side cycloid.

Lateral-Line System: Two lateral lines on eyed side, midlateral line with 70–82 scales, 10 scales between. No lateral line on blind side.

FIGURE 30.—Outline drawing of C. robustus, holotype (BMNH 1873.730.61) from Shanghai, China.

Interlinear scale rows

10

Frequencies

8

Fins: Dorsal with 125–134 (M = 129) rays, anal with 90–104 (M = 100) rays, caudal 10 in 8 specimens (radiographs).

Vertebrae: 56–61 comprising 10 (rarely 9) abdominal and 47–51 caudal elements in 8 specimens (radiographs).

Coloration: Upper side light brown, lower whitish in preserved specimens.

Size: Largest specimen examined, 413 mm, is from Onomichi, Japan.

DISTRIBUTION.—From South China Sea through Taiwan, Tung-hai, Yellow Sea, Po-hai to Korea and Japan.

DIAGNOSIS AND AFFINITIES.—Cynoglossus robustus is closely allied to C. arel. It differs from C. arel in having a more elongate body, longer snout, and smaller eyes with a wider interorbital space (3.70–7.94, M = 5.37 percent of length of head cf. 1.75–5.21, M = 3.43 percent). The number of interlinear scale rows further distinguishes the two species, C. robustus having an invariable number of 10, while C. arel has a count of 7–9 (M = 7).

NOTE ON SYNONYMY.—Günther’s (1873a:243) C. robustus was described on the basis of a specimen, 212.5 mm in TL, from Shanghai and characterized as having two lateral lines on ocular side, separated by 10 longitudinal series of scales, and one lateral line on blind side. From the Inland Sea of Japan, Regan (1905a:26) described C. brunneus based on a single specimen, 200 mm in TL. The salient feature in which this fish is differentiated from C. robustus is its slightly larger scales, with only 9 interlinear scale rows. I have examined the holotype of C. brunneus and found it to possess 10 scale rows between the middle and the upper lateral lines; therefore there can be no doubt that they are identical. Jordan and Starks (1906a:239) recorded C. robustus both from Japanese and Chinese waters but doubted the conspecificity of the Chinese C. robustus with that of the Japanese. Jordan, Tanaka, and Snyder (1913), however, gave a new name, C. inusita, to the Japanese specimens procured by Jordan and Starks. Hubbs (1915:494) concurred with Jordan and collaborators in keeping the Japanese form distinct and further pointed out that the Japanese specimens differed from the type specimens of C. robustus in having fewer rays (122–127) and scales (74) on the midlateral line, whereas the type specimens have 130 rays in the dorsal and 83 scales along the midlateral line. The differences in the fin rays and scale count noted by Hubbs in the Japanese specimens in comparison with the type specimens of C. robustus is not, however, substantiated by the more numerous specimens now available.

TYPE SPECIMENS.—Holotype of C. robustus, BMNH 1873.7.30.61, 296.5 mm SL, from Shanghai, China, coll. Swinhoe. Holotype of C. brunneus, BMNH 1905.6.6.248, 186 mm SL, from Inland Sea of Japan, coll. Gordon Smith.

OTHER MATERIAL EXAMINED.—CHINA: 1 specimen, BMNH 1862.11.1271, Shanghai, coll. Jamrach. 1, BMNH 1925.526.17, Yenting, China, ex. Sci. Soc., China. 1, BMNH 1031.12.1268, Chusen Is., China, coll. S. L. Hora (Indian Museum). 1, USNM 27016, China. coll. Jordan. 3, USNM 159452. Yellow Sea. China, coll. C. L. Hubbs, 1929. 1, KU 20726. E China Sea, ex. Kyoto University. 1, MCZ 11329, Hong Kong, coll. Capt. Putnam. TAIWAN: 1, USNM 7660. Taiwan, coll. F. Beker. 1, USNM 177429, Taipei Mkt., Taiwan, coll. D. K. Lawless. KOREA: 1, UMMZ 159452. Korea, near Fusan, coll. C. L. Hubbs, 1929. 4, UMMZ 159450, Korea, coll. C. L. Hubbs, 1929. JAPAN: 1, BMNH 1923:2.26.649, Tokyo, Japan, coll. Jordan. 1, USNM 37886, Tomo, Japan. 1, USNM 39966. Japan, coll. Hitchcock. 2, USNM 56386, Japan, coll. Jordan and Snyder. 2, USNM 56349, Onomichi, Japan, coll. Jordan and Snyder. 1, USNM 75933, Japan. 1, USNM 77145. Kobe, Japan, coll. Albatross, 1906. 1, USNM 159449, Osaka Mkt. Japan, coll. C. L. Hubbs, 7.10.1929. 1, USNM 159453, Kobe Mkt. Japan, coll. C. L. Hubbs, 1929. 2. USNM 159690. Mikawa Bay, Japan, coll. M. Tshikawa, 1922. 1, KU 12612, Kofu, Japan, coll. Kyoto University, Jan 1950.

28. Cynoglossus lingua Hamilton-Buchanan

FIGURE 31: PLATE 12

“Jerree Potoo.”—Russell, 1803:57, pl. 73.

Cynoglossus lingua Hamilton-Buchanan, 1822:32, 365 [type-locality: Gangetic estuaries].—Vinciguerra. 1889:190.—Günther, 1862:501.—Day, 1877:433, pl. 96: fig. 1; 1889:454, fig. 163.—Norman, 1928:200, fig. 16.—Weber and de Beaufort, 1929:203.—Smith, 1933:83.—Suvatti, 1936:97; 1950:327. —Munro, 1955:264.—Fowler, 1956:186.—Scott, 1959:42.—Kuronuma, 1961:32.—Pradhan, 1964:458 [Bombay coast].—Punpoka, 1964:62, fig. 20.

Plagusia lingua.—Cantor, 1850:1215.—Jerdon, 1853:148.

Arelia lingua.—Kaup, 1858:107.

Pleuronectes potous Cuvier, 1836:307.

Plagusia potous.—Bleeker, 1852:23.—Jerdon, 1853:148.

Arelia potous.—Bleeker, 1859:185.

Cynoglossus potous.—Bleeker, 1875:33. pl. 241: fig. 4.

Plagusia macrorhynchos Bleeker, 1851a:413 [type-locality: Tjilankahan]; 1852:22.

FIGURE 31.—Outline drawing of C. lingua (BMNH 1933.7.51.25) from Singapore.

Arelia macrorhynchos.—Kner, 1867:295.—Bleeker, 1875:3, pl. 242: fig. 2.—Weber and de Beaufort, 1929:208.

Cynoglossus acinaces Jenkins, 1910b:130 [type-locality: Khulna, E. Bengal].

DESCRIPTION.—Based on 18 specimens, 214.0–345.0 mm SL.

Depth of body 17.24–21.71 (M = 18.94), length of head 21.17–25.75 (M = 22.95) percent of standard length. Diameter of eye 5.26–8.51 (M = 6.51), interorbital width 1.75–6.40 (M = 3.28) percent in length of head. Anterior nostril of eyed side tubular, in front of lower eye, on upper lip, posterior nostril simple, in anterior half of interorbital space. Snout pointed, 37.04–45.00 (M = 41.21) percent of length of head, rostral hook rather short, extending just below the anterior nostril. Maxillary extending well beyond fixed eye; angle of mouth extending to just beyond vertical from posterior border of fixed eye, nearer to branchial opening than to tip of snout; tip of snout to angle of mouth 50.00–58.33 (M = 53.81), angle of mouth to branchial opening 40.47–49.09 (M = 45.57) percent of length of head.

Scales: Ctenoid on ocular side with cycloid scales on head and on the lateral lines; cycloid on blind side.

Lateral-Line System: Two lateral lines on ocular side, midlateral line with 90–101 scales, 11–12 scales between them. No lateral line on blind side. The midlateral line on the ocular side, instead of opening through simple pores on every scale, opens by means of ducts, one on either side into the adjoining scale (Figure 2).

Interlinear scale rows

11

12

Frequencies

5

16

Fins: Dorsal with 126–138 (M = 132) rays, anal with 97–114 (M = 101) rays, caudal 10 in 17 specimens (radiographs).

Vertebrae: 57–66, comprising 9 abdominal and 48–57 caudal elements in 17 specimens (radiographs).

Coloration: Upper side uniformly brown with or without darker patches, lower lighter in preserved specimens.

Size: Largest specimen examined, 378 (355 + 23) mm, is from Indonesia.

DISTRIBUTION.—From Malay Archipelago including Thailand and Vietnam to seas and estuaries of India and Pakistan.

DIAGNOSIS AND AFFINITIES.—Cynoglossus lingua is closely related to the other two species of the arel complex, but it is immediately distinguished from them by the marked elongation of the body, a longer snout, much smaller eyes, and smaller body scales having an interlinear scale count of 11–13(M = 12).

NOTE ON SYNONYMY.—Hamilton-Buchanan (1822: 32) described C. lingua from the Gangetic estuaries, based on his unpublished original drawings now preserved in the Asiatic Society of Bengal and reproduced by Hora (1929, pl. 15: figs. 1, 2). Norman (1928:200) included in the synonymy Pleuronectes potous Cuvier, Plagusia macrorhynchos Bleeker, C. elongatus Günther, and C. acinaces Jenkins. I concur with Norman in including all these species as synonyms of C. lingua except C. elongatus, which I have synonymized with C. arel.

Bleeker (1851a:413) described P. macrorhynchos on the basis of a figure of the fish from Tjilankakan, Bantam. There is no specimen of the fish in Leiden (pers. comm. Dr. M. Boeseman). Cuvier’s description of P. potous was based on Russel’s “Jerree Potoo” and not on any specimen. Jenkins (1910b: 130) described C. acinaces on the basis of five specimens, 59–148 mm SL, from Morrelganj, Kulna district, Bangladesh and related it to C. elongatus and C. lingua but differentiated them in the much higher number of rays in the dorsal and anal fins and in the greater slenderness of the body. The differences noted by Jenkins fall within the normal range of variation of C. lingua.

TYPE SPECIMENS.—Günther (1862:501) considered a stuffed specimen from the Ganges in the British Museum, presented by G. R. Whitehouse, as probably the type of C. lingua. Günther (1861: IV), referring to the Whitehouse collections, was very cautious saying that he “believed [it] to contain many typical specimens of Hamilton-Buchanan’s work.” Hora (1929) examined this question and concluded that there was absolutely no evidence to show that the Whitehouse collections contained Hamilton-Buchanan’s specimens. Hamilton-Buchanan never kept any zoological collections and for his descriptions in the “Gangetic Fishes” he relied entirely on his drawings and field notes. I have not been able to locate the stuffed specimen referred to by Günther.

A specimen ZSI F 4149/1, 148 mm SL, the largest of the syntypes, from Sunderbans of Kulna district, Bangladesh, is selected here as the lectotype of C. acinaces. The other four specimens, 59–114 mm SL, are paralectotypes.

OTHER MATERIAL EXAMINED.—CHINA: 1 specimen, BMNH 1862.11.1.271, Shanapai, coll. Jamrack. INDONESIA: 2, USNM 72748, Batavia, Java, coll. O. Brayant, 4.2.1909. 1, ZMA 108005, Indonesia, coll. P. Bleeker, 1806. 1, ZMA 108006, Indonesia, coll. Gier Expd., 1908. 2, MCZ 30812, Batavia, coll. Brayant and Palmix. BORNEO: 2, USNM 137410 and 13411, Luzon and Borneo, coll. Albatross. THAILAND: 3, USNM 103320, Thailand, coll. H. M. Smith, 23.6.1933. 2, USNM 119682, Thailand, coll. H. M. Smith, 23.6.1933. 5, ANSP 76788, Thailand, coll. R. M. Schauensee, 1936. 1, ANSP 76813, Thailand, coll. R. M. Schauensee, 1936. 3, ANSP 87318, Thailand, coll. R. M. Schauensee, 1936. 2, ANSP 274537, Bangkok, coll. R. M. Schauensee. 6, ANSP 89447, Bangkok, coll. R. M. Schauensee and H. W. Fowler, 1936. 5, CAS (CVF), Gulf of Thailand, coll. local fishermen, 7.9.1957. 3, CAS (CVF) 2582, lat. 13°26′N, long. 100°10′E, coll, Naga Expd., 17.5.61. 1, MCZ 11338, Thailand, coll. C. L. Salmin, 1871. 1, UMMZ 181230, Gulf of Thailand, coll. John Bardach. 1. BMNH 1934.12.18.78, Gulf of Siam, coll. Siamese Museum. BURMA: 3, MCZ 11134, Rangoon, coll. Theobals. 1, BMNH 1870.6.14.7, Moulmein, coll. F. Day. 1, ZSI, off Akyab, 34 fms, coll. Marine Survey. SINGAPORE: 1, MCZ 11513, Singapore, coll. Capt. Putnam. 3, BMNH 1933.7.3154–26, Singapore Mkt., coll. Raffles Museum. VIETNAM: 1, TNSP 76858, Saigon, coll. Hugo Rutherford, Dec 1934. MALAYA: 4, MCZ 274867, Penang, coll. Capt. Putnam. 1, BMNH 1938.8.10.1, Penang, coll. Fish Inst. 1, BSI 9055, Penang, coll. F. Stoliczka. INDIA: 1, BMNH 1855.12.26.601, Ganges, coll. Zool. Soc. 1, BMNH 1872.4.17.37, N. E. Bengal, coll. Jordan. 2, BMNH 1889.2.1.4051. 4055, Calcutta, coll. F. Day. 1, BMNH 1889.2.1.4054, Calcutta, coll. F. Day. 1, BMNH 1889.2.1.4056, Orissa, coll. F. Day. 1, BMNH 1889.2.1.4057, Madras, coll. F. Day. 2, BMNH 1928.3.20.85–86, locality not given, ex. Indian Museum. 1, ZSI 1461, Calcutta, coll. F. Day. 1, ZSI, Mouth of Arasalar R., Karaikal, coll, A. G. K. Menon, 10.3.58. 1, ZSI, Sunderbans, coll. A. Rahim. 1, ZSI, Sullermukai R., 24-Pargans, coll. J. T. Jenkins. 16, ZSI, Karar, N Kanara Dt., Maharasra, coll K. K. Tiwari, 20.2.56 6, ZSI, Sunderbans, coll. S. W. Kemp. 1, ZSI, Pulta Water Works, Barrackpore, coll. Pulta Survey. l, ZSI, 24-Parganas. coll. Bengal Fisheries. 1, ZSI, 24-Parganas, coll. J. T. Jenkins. 1, ZSI, Nabaspur, coll. J. T. Jenkins. 1, specimen, ZSI (unregistered), Morrison Bay, coll. Chilka Survey. 1, ZSI 1208, Calcutta.

The cynoglossus group

This is a group of specialized species of Cynoglossus characterized by relatively small eyes (pedunculate in monopus) separated by a small interorbital space, a moderately elongate snout with the angle of mouth situated nearer tip of snout than to branchial opening (except lida), two lateral lines on ocular side, and relatively small ctenoid scales on both sides of the body. No lateral line on blind side.

Included in this group are the cynoglossus, monopus, puncticeps, and lida complexes. Their combined range covers the whole of the Malay Archipelago, the seas of India and Pakistan, and the East Coast of Africa. This group appears to be related to the arel complex and may have evolved from a recent offshoot of the arel stock.

The cynoglossus complex

Cynoglossus cynoglossus, C. semifasciatus, and C. macrostomus form the cynoglossus complex. The characteristics of this complex are the small eyes separated by a small interorbital space, obtusely pointed snout with the angle of the mouth nearer to the tip of snout than to the branchial opening, two lateral lines on ocular side, and relatively small scales on body, the interlinear scale count being 12 to 16. This complex ranges through the Malay Archipelago and the seas of India and Pakistan.

29. Cynoglossus cynoglossus (Hamilton-Buchanan)

FIGURE 32; PLATE 13

Achirus cynoglossus Hamilton–Buchanan, 1822:132, 373 [type-locality: Ganges mouth].

Plagusia cynoglossus.—Cantor, 1850:1211.

Icania cynoglossa.—Kaup, 1858:109.

Cynoglossus cynoglossus.—Norman, 1928:208 [Bengal].—Weber and de Beaufort, 1929:199.—Punpoka, 1964:60.

Plagusia oxyrhynchos Bleeker, 1851a:416 [type-locality: Batavia]; 1852:26.

Arelia oxyrhynchos.—Bleeker, 1859:185.

Cynoglossus oxyrhynchos.—Günther, 1862:499.—Bleeker, 1875:36, pl. 245: fig. 1.—Weber and de Beaufort, 1929:201.

Plagusia sumatrana Bleeker, 1853c:529 [type-locality: Benculen, Sumatra].

Arelia sumatrensis.—Bleeker, 1859:185.

Cynoglossus sumatrensis.—Günther, 1862:497.—Bleeker, 1875:35, pl. 243: fig. 1.—Jordan and Richardson, 1908:281 [Ticao Island].—Fowler. 1918b:65 [Philippines].

Cynoglossus sumatranus.—Norman, 1928:209.—Weber and de Beaufort, 1929:202.—Fowler, 1938:88.—Herre. 1953:191.—Punpoka, 1964:72.

Plagusia bengalensis Bleeker, 1853a:152 [type-locality: Hooghly, Calcutta].

Cynoglossus bengalensis.—Günther, 1862:499 [Ganges].—Day, 1877:435, pl. 97: fig. 4 [Hooghly, Calcutta].

Cynoglossus hamiltonii Günther, 1862:504 [Ganges: Pinang].—Duncker, 1904:169.

Cynoglossus buchanani Day, 1869:522 [India].

Cynoglossus dellae Jenkins, 1910b:130 [type-locality: Khulna, E Bengal].—Norman, 1928:212.

Cynoglossus semifasciatus [not Day].—Suvatti. 1936:98; 1950: 328.—Punpoka. 1964:70.

DESCRIPTION.—Based on 45 specimens, 62.0–147.0 mm SL, including the lectotype and paralectotype of C. dellae.

Depth of body 22.03–34.21 (M = 27.11), length of head 18.94–28.95 (M = 22.54) percent of standard length. Diameter of eye 3.03–13.04 (M = 8.44), interorbital space 1.89–9.68 (M = 3.56) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, either in front of interorbital space or in anterior half of it. Snout obtusely pointed, 21.43–45.45 (M = 32.87) percent of length of head, rostral hook rather short, extending to front of anterior nostril or reaches just short of perpendicular through anterior border of fixed eye. Maxillary extending to below posterior border of fixed eye or just behind it; angle of mouth extending below vertical from posterior half of fixed eye, nearer to tip of snout than to branchial opening, tip of snout to angle of mouth 39.22–53.49 (M = 45.64), angle of mouth to branchial opening 47.37–60.71 (M = 51.97) percent of length of head.

Scales: Ctenoid on both sides.

Lateral-Line System: Two lateral lines on ocular side, dorsolateral line usually undulating and stop ping at a very short distance from caudal base, midlateral line with 70–90 (M = 82) scales, 12–14 (M = 13) scales between them. No lateral line on blind side.

FIGURE 32.—Outline drawing of C. cynoglossus (BMNH 1858.8.15.55) from Ganges, coll. G. K. Waterhouse.

Interlinear scale rows

12

13

14

Frequencies

6

8

26

Fins: Dorsal with 95–102 (M = 100) rays, anal with 72–78 (M = 75) rays, caudal 10 in 42 specimens (radiographs).

Vertebrae: 44–48, comprising 9 abdominal and 35–39 caudal elements in 42 specimens (radiographs).

Coloration: Upper side uniformly brownish with or without darker spots, lower whitish in preserved specimens.

Size: Largest specimen examined, 160 (147+13) mm, is from the Ganges.

DISTRIBUTION.—From Malay Archipelago to Philippines, and westward to Burma, Bangladesh, and India (W Bengal). In seas and estuaries as far as the tidal reaches.

DIAGNOSIS AND AFFINITIES.—The nearest relative of C. cynoglossus is C. semifasciatus. The species, however, differs in several respects, especially in the obtusely pointed and longer snout (mean length 32.87 percent of length of head cf. 27.40 percent), wider interorbital space (mean width 3.56 percent of head cf. 2.16 percent), and the greater number of interlinear scale rows (12–14, M = 13 cf. 11–14, M = 12).

NOTE ON SYNONYMY.—Hamilton-Buchanan (1822:132) described C. cynoglossus from the Ganges on the basis of his original drawing of the fish now in the Asiatic Society of Bengal and reproduced by Hora (1929, pl. 19: figs. 2, 3). Norman (1928:208) synonymized Plagusia bengalensis Bleeker with C. cynoglossus and Bleeker’s P. oxyrhynchos and P. sumatrana are here included under C. cynoglossus. Bleeker (1851a:416) characterized P. oxyrhynchos by its two lateral lines on the left side separated by 13 longitudinal series of scales, a single lateral line on the blind side, two nostrils, and subcontiguous eyes; and P. sumatrana (Bleeker, 1853c:529) with two lateral lines on the left side, one on the right, two nostrils, and a wider interorbital space. He, did not, however, indicate the interlinear scale rows in P. sumatrana. I have examined a specimen of P. sumatrana (BMNH 1862.6.3.9) and another of P. oxyrhynchos (BMNH 1862.6.3.17) from the Bleeker collection in the British Museum and compared them with the specimens of C. cynoglossus from the Ganges, and I have no hesitation in synonymizing them. In the specimens examined, the lateral line on the blind side, stated to be present on Bleeker’s P. oxyrhynchos and P. sumatrana, is absent and in all other respects they conform well with C. cynoglossus.

Jenkin’s (1910b:130) C. deltae was described on the basis of two specimens from Morrelganj, Kulna, Bangladesh, and he characterized it by two lateral lines on the ocular side separated by 10–12 series of scales. In the interlinear count, as well as in all other meristic and proportional measurements, the types of C. deltae agree so well with C. cynoglossus that they are undoubtedly conspecific.

Günther’s (1862:504) C. hamiltonii, described on the basis of a dried skin from Cantor’s collection from Penang in the British Museum, and characterized with two lateral lines on the left separated by 13 series of scales is synonymized here with C. cynoglossus. Günther has not noted any conspicuous nostril in his specimen. I have not been able to trace the type (skin) mentioned in Günther’s catalog to ascertain whether the nostril is present or not. From the other details of the description, however, I have come to a definite conclusion that C. hamiltonii is nothing other than C. cynoglossus.

TYPE SPECIMENS.—As stated earlier, Hamilton-Buchanan never kept any zoological collections and for his descriptions he entirely relied on his drawings and field notes. Cynoglossus cynoglossus was not figured in his book on the fishes of the Ganges (1822) either. Hora (1929:pl. 19: figs. 2 and 3), however, reproduced Hamilton-Buchanan’s manuscript drawing of C. cynoglossus, a specimen measuring about 106 mm long.

Bleeker’s description of P. oxyrhynchos was based on five specimens, 100–120 mm in TL from Batavia. Bleeker in his Atlas (6:36, pl. 245: fig. 1) redescribed the species on eight specimens, 100–120 mm in TL from Batavia, Borneo, and Amboina and illustrated it.

In the Bleeker collection in Leiden there are six specimens, 88–111 mm SL, 97–123 TL, of P. oxyrhynchos cataloged as RMNH 6793. Chabanaud in 1946 indicated a specimen, 92 mm SL, 101 mm TL, as the lectotype. The largest specimen estimated here as measuring 123 mm TL may have been the “120” specimens that Chabanaud seems to have rejected because of damage. The 92 mm SL specimen is recognized as the lectotype and retained as RMNH 6793, the remaining five specimens including the “120” example having been removed to RMNH 26210. Of these five, two, 58–90 mm S.L., 97–99 mm TL, are too small to be considered as paralectotypes; the other three specimens, 93–111 mm SL, 103–123 mm TL, are recognized as paralectotypes. (Dr. M. Boeseman examined the type material on my behalf.)

Bleeker (1853c:526) described P. sumatrana based on a single specimen 121 mm long from Benculen, Sumatra. In the Bleeker collection in Leiden there is a specimen cataloged as RMNH 6787, which unfortunately is mutilated with the head mostly missing, but otherwise agrees with Bleeker’s figure of a 121 mm example. Strangely Bleeker, in the Atlas (6:36), refers to only a single specimen though he lists three localities. According to Dr. Boeseman, at the 1879 auction there was only a single specimen in the Bleeker collection and since it agrees with Bleeker’s figure in size, it must be the holotype.

Bleeker’s description of P. bengalensis was based on two specimens, 120 mm TL and 139 mm TL, from Hooghly River near Calcutta. According to Dr. Boeseman, in the Bleeker collection in Leiden there are two examples, 106 mm SL, 120 mm TL and 126 mm SL, 139 mm TL, both syntypes, cataloged as RMNH 6794. The largest specimen is selected here as the lectotype, and is retained as RMNH 6794; the other specimen recataloged as RMNH 26211 is the paralectotype.

A specimen, 64.0 mm SL, ZSI F 4150/2 from the Sunderbans of Morelganj, Khulna district, Bangladesh, collected by Bengal Fisheries, is selected as the lectotype of C. deltai and a specimen, BMNH 1928.3.20.133, 62.5 mm SL, taken along with the lectotype as the paralectotype.

OTHER MATERIAL EXAMINED.—PHILIPPINES: 1 specimen, ANSP 49038, Philippines, coll. R. M. de Schauensee. 1, NHV 43826. Philippines, coll. Naga Expd. INDONESIA: 1. BMNH 1862.6.3.9, Sumatra, coll. P. Bleeker. 1, BMNH 1862.6.3.17, locality not given, coll. P. Bleeker. 1, BMNH 1931.4.23.46, Batavia Mkt., coll. Hardenberg. I, ZMA 108.007. Indonesia, coll. Kleiweg de Zwaan. I, AMNH 18414, Java, coll. Zeeviss. I. USNM 87943, Sumatra, coll. H. C. Kollers. THAILAND: 2, ANSP 59918, Thailand, coll. R. M. de Schauensee. 3, ANSP 61843–51, Thailand, coll. R. M. de Schauensee. 1, ANSP 87278. Thailand, coll. R. M. de Schauensee. 4, ANSP 87840. Thailand, coll. R. M. de Schauensee. 31, ANSP 89461, Thailand, coll. R. M. de Schauensee. 6, CAS (GVF), Gulf of Thailand, coll. Naga Expd. 1. CAS (GVF), Thailand, coll. Naga Expd. 1, NHV 43766, Thailand, coll. Naga Expd. MALAYA: 2, MCZ 30343, Penang coll. E. P. Ward. BURMA: 1, BMNH 1928.3.20.112, Mergui, coll. Indian Museum. 2, ANSP 77027, Burma, coll. Halberg. 4, MCZ 33199, Burma. INDIA: 1, BMNH 1852.9.13.235A, Hooghly R., coll. Zool. Society. 1, BMNH 1855.9.19.12.32. Ganges, coll. Hasler. 1, BMNH 1855.12.26.602. R. Ganges, coll. Zool. Soc. 1, BMNH 1862.6.3.9, Sumatra, coll. P. Bleeker. 1, BMNH 1862.6.3.17, locality not given, coll. P. Bleeker. 2, BMNH 1889.2.1.4065–66. Calcutta, coll. F. Day. 1, BMNH 1928.3.20.133, Sunderbans, ex. Indian Museum. 2, BMNH 1928.3.20.108 and 112, Calcutta, ex. Indian Museum. 3, BMNH 1928.3.20. 109–111. Hooghly R, ex. Indian Museum. 1, BMNH 1934.11.21.8c, Hooghly R., ex. Zoological Survey of India. 2, BMNH 1954.5.20.21, Hooghly R., ex. Zoological Survey of India. 1, ZSI 461, Calcutta, coll. J. Anderson. 1. ZSI 1499, Calcutta, coll. F. Day. 1, ZSI 2689, Calcutta, coll. F. Day. 2, ZSI 752/2. Hooghly R., coll. Hooghly Survey. 2, ZSI (unregistered), Tolly’s Nallah, coll. Nirod. 1, ZSI F 2014/2, Barrackpore, coll. Pulta Survey. 2, ZSI F 3434/1, Orissa coast, coll. C. A. Paiva. 6, ZSI F 5042/2, Sunderbans, Gangetic delta, coll. S. W. Kemp. 1, ZSI 6865/2, Sunderbans, Gangetic delta, coll. S. W. Kemp.

30. Cynoglossus semifasciatus Day

FIGURE 33; PLATE 13

Cynoglossus semifasciatus Day, 1877:436, pl. 97: fig. 5 [type-locality: ‘Sea at Madras’]; 1889:458.—Alcock, 1889:289.—Jenkins, 1910a:30.—Norman, 1928:207.

Cynoglossus brevtrostris Day, 1877:437, pl. 97: fig. 6 [type-locality: Madras]; 1889:459.—Norman, 1928:212.

Cynoglossus bengalensis [not Bleeker].—Johnstone, 1904:209.

Cynoglossus cynoglossus [not Hamilton-Buchanan].—Munro, 1955:266, pl. 50 [Ceylon].—De Silva, 1956:197 [Ceylon].

DESCRIPTION.—Based on 41 specimens, 75.5–136.0 mm SL, including the holotype of C. semifasciatus and C. brevirostris.

Depth of body 24.53–31.58 (M = 27.88), length of head 19.81–29.41 (M = 22.76) percent of standard length. Diameter of eye 5.36–12.96 (M = 8.29), interorbital space narrow, 1.79–2.50 (M = 2.21) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in the anterior half of interorbital space. Snout rounded or obtusely pointed, 21.43–32.50 (M = 27.40) percent of length of head, rostral hook rather short, extending to front of anterior nostril. Maxillary extending well beyond posterior border of fixed eye; angle of mouth extending a little beyond vertical from fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 33.33–47.62 (M = 41.66), angle of mouth to branchial opening 47.62–60.73 (M = 54.64) percent of length of head.

Scales: Ctenoid on both sides, including those of lateral lines.

FIGURE 33.—Outline drawing of C. semifasciatus (BMNH 19282.6.1) from Tanur, Malabar coast.

Lateral-Line System.—Two lateral lines on ocular side, the dorsolateral line entering the dorsal fin at a short distance from the caudal base, the midlateral line with 70–78 (M = 75) scales, 11–14 (M = 12) scales between them in 31 examples. No lateral line on blind side.

Interlinear scale rows

11

12

13

14

Frequencies

2

16

11

2

Fins: Dorsal with 99–107 (M = 102) rays, anal with 75–83 (M = 79), caudal 10 in 23 specimens (radiographs).

Vertebrae: 47–50 comprising 9 abdominal and 38–41 caudal elements in 23 specimens (radiographs).

Coloration: Upper side light brownish with a number of irregular vertical dark bands, lower whitish in preserved specimens.

Size: The largest specimen examined from Porto-novo, Madras, trawled by Anton Bruun is 138 (123+15) mm long.

DISTRIBUTION: East coast of India and Ceylon, recorded from a depth of 7–10 fms.

DIAGNOSIS AND AFFINITIES.—In many morphometric characters C. semifasciatus resembles C. macrostomus. It is distinguishable, however, by its deeper body (mean depth 27.88 percent of SL cf. 25.89 percent), lesser number of interlinear scales (11–14, M = 12 cf. 14–16, M = 15), and midlateral scales (70–78, M = 75 cf. 80–92, M = 83).

NOTE ON SYNONYMY.—Day (1877:436) described C. semifasciatus on the basis of a single specimen from Madras coast and characterized it as having two lateral lines on ocular side separated at then highest distance by 12 or 13 rows of scales. Norman (1928), in his revision of flatfishes of India, noted that in C. semifasciatus the lateral lines on the ocular side are separated by 13–14 series of scales and not 12 or 13 as Day observed. The name C. semifasciatus, however, had been wrongly assigned to the commercial species of the Malabar coast, namely, C. macrostomus, having wider range of 15–16 scales between the lateral lines (Menon 1971). This was mainly brought about by Norman’s (1928: 207) placing C. semifasciatus in the group, showing a range of 12 or 15 scales between the lateral lines in his key to the species of Cynoglossus; thereby, workers using Norman’s key, having assumed a wider range for C. semifasciatus, confused the Malabar sole for this species. Cynoglossus semifasciatus can be readily distinguished by its lower number of interlinear scales, 11–14 (M = 12) cf. 14–16 (M = 15).

Day (1877:437) described another species from Madras coast, C. brevirostris, based on a single specimen and characterized it as having a lesser number of 10 scale rows between the lateral lines on ocular side. I have examined the holotype of C. brevirostris and found it to have 11 interlinear scales, which falls within the range of variation of this character for C. semifasciatus. I have, therefore, included C. brevirostris in the synonymy of C. semifasciatus.

TYPE SPECIMENS.—Holotype of C. semifasciatus, ZSI 2490, 102 mm SL, Madras coast, coll. F. Day. Holotype of C. brevirostris, ZSI 2690, 110 mm SL, Madras coast, coll. F. Day.

OTHER MATERIAL EXAMINED.—INDIA: 2 specimens, ZSI 2S59/2, 2360/2, Marina Beach, Madras, coll. ZSI, Southern Regional Sta. 1, ZSI F 3437/1, Puri, Orissa coast, coll. Golden Crown. 2, ZSI 12680/2, Gopalpur, Orissa, coll. Investigator. 2, ZSI (unregistered), Madras, coll. A. Daniel. 28, ZSI (unregistered), Waltair coast, coll. K. V. Sekharan. 2, BMNH 1889.2.1.4066–67, Calcutta, coll. F. Day. 1, BMNH 1928.3.20.107, Ganjam coast, coll. Investigator. 1, SOSC, Ref. 334, Thirumulli, Madras, lat. 11°13′N, long. 79°53′E, coll. Anton Bruun, 23.9.1966. 3, SOSC Ref 334, Madras, lat. 11°35′N, long. 79°5′E, coll. Anton Bruun. 1, SOSC Ref 334, Vellar Estuary Madras, lat. 11°30′N, long 79°50′E, coll. Anton Bruun. 4, SOSC Ref 334, Porto Novo, Madras. coll. Anton Brunn.

31. Cynoglossus macrostomus Norman

FIGURE 34; PLATE 14

Cynoglossus hamiltonii [not Günther].—Day, 1877:436, pl. 95: fig. 3 [“Hooghly at Calcutta”]; 1889:458.

Cynoglossus macrostomus Norman, 1928:204 [type-locality: Hooghly Estuary, near Calcutta].

Cynoglossus luctuosus Chabanaud, 1947e:813 [type-locality: Madras].

Cynoglossus semifasciatus [not Day].—Seshappa and Bhimachar, 1955:183.—Saramma, 1963:77 [Kerala coast].

Cynoglossus cynoglossus [not Hamilton-Buchanan].—Saramma, 1963:77 [Kerala coast].

DESCRIPTION.—Based on 40 specimens, 90–138 mm SL, including the holotypes and paratypes of C. macrostomus and C. luctuosus.

Depth of body 23.11–28.11 (M = 25.89), length of head 23.97–30.83 (M = 26.39) percent of standard length. Eye diameter 5.56–10.34 (M = 7.59), interorbital space sometimes absent, 1.39–4.17 (M = 2.94) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in the anterior half of interorbital space. Snout obtusely pointed, 20.59–30.0 (M = 25.80) percent of length of head, rostral hook short, extending to front of anterior nostril. Maxillary extending to well beyond posterior margin of fixed eye; angle of mouth extending to below vertical from posterior border of fixed eye or just beyond it, nearer to tip of snout to branchial opening, tip of snout to angle of mouth 35.29–47.50 (M = 40.49), angle of mouth to branchial opening 43.55–62.07 (M = 57.48) percent of length of head.

Scales: Ctenoid on both sides.

Lateral-Line System: Two lateral lines on ocular side, dorsolateral line curving onto dorsal fin at a short distance from caudal base, midlateral line with 80–92 (M = 83) scales; 14–16 (M = 15) scales between them. No lateral line on blind side.

Interlinear scale rows

14

15

16

Frequencies

13

17

10

Fins: Dorsal with 100–106 (M = 103) rays, anal with 78–84 (M = 80), caudal 10 in 23 specimens (radiographs).

Vertebrae: 48–51 comprising 9 abdominal and 38–42 caudal elements in 23 specimens (radiographs).

Coloration: Upper side light brownish with dark brown mottling on it, giving the appearance of several irregular transverse bands, lower whitish in preserved specimens.

Size: Largest specimen examined, 154 (138 + 18), is from Cochin.

DISTRIBUTION.—Seas and estuaries of India; recorded from a depth of 8–12 fans.

DIAGNOSIS AND AFFINITIES.—Cynoglossus macrostomus closely resembles C. semifasciatus, particularly with regard to the extension of the maxillary beyond the posterior border of the fixed eye, the relatively larger eyes, and the vertebral and fin-ray counts. Cynoglossus macrostomus is, however, easily distinguishable by the large number of interlinear scale rows (14–16, M = 15 cf. 11–14, M = 12) and the midlateral scale rows (80–92, M = 83 cf. 70–78, M = 75), the more elongate body (depth 23.11–28.33, M = 25.89 percent of SL cf. 24.53–31.58, M = 27.88 percent), longer head (23.97–30.83, M = 26.89 percent of SL cf. 19.81–29.41, M = 22.76), and the coloration, especially the distinctive blackish nature of the fins.

NOTE ON SYNONYMY.—Norman (1928:204) considered C. hamiltonii described by Day (1877:436) as distinct from C. hamiltonii Günther (1862:504) and described it as C. macrostomus, basing his description on two specimens from “Calcutta and Orissa.” He characterized the new species as having two lateral lines on ocular side, divided by 15 or 16 rows of scales. This species, which forms an important commercial fishery on the west coast of India and popularly known as the “Malabar sole,” has all along been confused with C. semifasciatus (Menon, 1971). Cynoglossus macrostomus can, however, be readily distinguished from C. semifasciatus by its larger number of interlinear scales, 14–16 (M = 15) cf. 11–14 (M = 12). Another species confused with the Malabar sole is C. luctuosus Chabanaud (1947c:813) described on the basis of nine specimens from Tanur on the Malabar coast and characterized with 14–15 rows of scales between the lateral lines on the ocular side. I have examined the type of this species in London and found the species to be identical with C. macrostomus. I have, therefore, synonymized them.

FIGURE 34.—Outline drawing of C. macrostomus (BMNH 1932.2.6.1) from Tanur, Malabar coast.

TYPE SPECIMENS.—Holotype of C. macrostomus, ZSI 1460, 121 mm SL, Hooghly estuary near Calcutta, coll. F. Day; paratype, BMNH 1889.2.1.4074, 122.5 mm SL, Orissa, India, coll. F. Day. Holotype of C. luctuosus, BMNH 1932.2.6.8, 133 mm SL, Tanur, coll. D. W. Devanasen; 8 paratypes, BMNH 1932.2.6.1–7 and 9, 106–138 mm SL, Tanur obtained along with holotype.

OTHER MATERIAL EXAMINED.—INDIA: 1 specimen, BMNH 1928.3.20.132, Portugese India, coll. S. W. Kemp. 2, ZSI 143. Mormugao Bay, Goa, coll. S. W. Kemp. 4, ZSI 173–6, Mormugao Bay, Goa, coll. S. W. Kemp. 1, SOSC Ref 334, Neendakara, Kerala, lat. 08°55′N, long. 76°30′E, coll. Anton Bruun, 6.10.1966. 1, SOSC Ref 334, Ernakulam, Kerala, lat. 10°0′N, long. 76°12′E, coll. Anton Bruun. 1, SOSC Ref 334, Kerala, lat. 09°21′N, long 76°17′E, coll. Anton Bruun. 22, SOSC Ref 334, Neendakara, Kerala, lat. 08°56′N, long. 76°30′E, coll. Anton Bruun. 17, SOSC Ref 334, Cochin, Kerala, lat. 10°00′N, long. 76°08′E, coll. Anton Bruun. 1, ANSP 7485S, Calicut, coll. Madras Fisheries Department.

The monopus complex

Cynoglossus monopus, the only species of the monopus complex, is typified by its small pedunculate eyes placed close together before the eyes. Its range extends from the Malay Archipelago to seas of India toward the west, and northward along the South China Sea to Hong Kong.

32. Cynoglossus monopus (Bleeker)

FIGURE 35; PLATE 14

Plagusia monopus Bleeker, 1849:11 [type-locality: Bali].

Cynoglossus monopus.—Bleeker, 1875:38, pl. 245: fig. 4.— Alcock, 1896:330.—Norman, 1928:204.—Weber and de Beaufort, 1929:197.—Chu, 1931:94.—Smith, 1933:84.—Fowler, 1934b:219.—Suvatti, 1936:94; 1950:326.—Kuronuma, 1961:32.—Punpoka, 1964:66 [Sumat Prakarn Province, Thailand].

Plagusia melanopterus Bleeker, 1851a:415; 1852:25.

Arelia melanopterus.—Bleeker, 1859:184.

Cynoglossus melanopterus.—Günther, 1862:502.—Alcock, 1889: 289.—Seale, 1914:78 [Hong Kong].—Chu, 1931:94.

Arelia ceratophrys Kaup, 1858:108.

DESCRIPTION.—Based on 11 specimens, 94.0–153.0 mm SL.

Depth of body 21.90–26.12 (M = 23.58), length of head 19.46–21.57 (M = 20.37) percent of standard length. Eyes small, close together and pedunculate; diameter of eye 4.0–6.78 (M = 5.80) percent of length of head, interorbital space almost absent Two nostrils on ocular side, close together in front of the anterior border of fixed eye, anterior nostril tubular, posterior simple. Snout obtusely pointed, 26.32–37.29 (M = 31.82) percent of head, rostral hook rather short, ending just in front of anterior nostril. Maxillary extending to below posterior border of fixed eye or just behind it; angle of mouth extending to below vertical from posterior half of fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 39.39–47.62 (M = 44.06), angle of mouth to branchial opening 53.06–64.41 (M = 57.76) percent of length of head.

Scales: Ctenoid on both sides, including those on lateral lines.

Lateral-Line System: Two lateral lines on ocular side, dorsolateral line undulated, entering dorsal fin along 3rd to 5th ray, counted from the rear, midlateral line with 108–125 (M = 117) scales, 16–20 (M = 17) scales between them. No lateral line on blind side.

FIGURE 35.—Outline drawings of C. monopus (BMNH 1862.6.3.13) from Bleeker’s collection.

Interlinear scale rows

16

17

18

19

20

Frequencies

5

2

1

2

1

Fins: Dorsal with 115–120 (M = 117) rays, anal with 92–96 (M = 94), caudal 10 in 6 specimens (radiographs).

Vertebrae: 53–56, comprising 9 abdominal and 44–47 caudal elements in 6 specimens (radiographs).

Coloration: Upper side light brownish, lower whitish in preserved specimens.

Size: Largest specimen examined, 188.5 mm in SL, is from Bangkok.

DISTRIBUTION: From Malay Archipelago to Hong Kong and to northern part of Bay of Bengal; recorded from a depth of 7–10 fms.

DIAGNOSIS AND AFFINITIES.—Cynoglossus monopus occupies a rather isolated position with regard to the position of the nostrils, which are placed close together in front of the anterior border of the fixed eye, and the small pedunculate eyes. The most closely related species is C. macrostomus. In the obtusely pointed snout, the elongate nature of the body, and especially in the blackish coloration of the posterior portion of the fins in fresh specimens, these species resemble each other to a certain extent. There is no doubt that C. monopus evolved from a macrostomus-like ancestor.

NOTE ON SYNONYMY.—Norman (1928:204) included P. melanopterus Bleeker and A. ceratophrys Kaup in the synonymy of C. monopus (Bleeker) and I concur with him.

TYPE SPECIMENS.—Bleeker (1849:11) described P. monopus from Batavia and Boleling, Bali and another species P. melanopterus Bleeker (1851a:415) from Batavia and Boleling, Bali, actually as a replacement name for P. monopus and obviously based on the same types, but possibly including a few additional specimens for P. melanopterus collected after the publication of P. monopus but earlier than that of C. melanopterus. Unfortunately, Bleeker did not mention the number of specimens on which the description of P. monopus was based but only the maximum size of the specimens, namely 180 mm, was indicated. This maximum size mentioned for P. monopus is obviously erroneous as in the subsequent description of P. melanopterus consisting of the same material. The maximum size mentioned is 170 mm, Bleeker’s (1850a:415) description of P. melanopterus being based on 11 specimens, 95 to 170 mm in TL.

According to Dr. M. Boeseman, the specimens cataloged as RMNH 6799 (1879 auction) originally contained 11 specimens, including the types of both P. melanopterus and P. monopus, but there is no specimen of 170 mm in length in it, and there may or may not be a syntype of P. monopus in the original material. According to him, however, it seems reasonable to assume that actually the maximum size must have been only 160 mm, as the jar originally included 11 examples, 83–147 (92.5–159) mm.

Chabanaud in 1946 removed two of the smaller, 83–100 (92.5–100) mm, specimens to C. oxyrhynchus and a specimen of 130 (141) mm was selected as the lectotype of C. melanopterus and indicated as such in the label.

Since C. melanopterus was described as a replacement name for C. monopus, it is appropriate to consider the 141 mm specimen as the lectotype of P. monopus. It is accordingly selected here, retaining RMNH 6799. The remaining 8 specimens are paralectotypes of both C. melanopterus and C. monopus are recataloged as RMNH 26212.

OTHER SPECIMENS EXAMINED.—INDONESIA: 1 specimen, BMNH 1862.6.3.13, loc. not given, coll. P. Bleeker. 2, BMNH 1931.4.23.43–44, Java, coll. Hardenberg. 1, BMNH 1931.4.23–45, Bay of Batavia, coll. Hardenberg. 3, AMNH 17014, Sumatra, coll. Zeeviss, 1941. 6, AMNH 19815, Sumatra, coll. Zeeviss, 1941. 1, ZMC. (unregistered), St. Helena, coll. Th. Mortensen, 1930. PHILIPPINES: 1, AMNH 19645, Celebes, coll. Zeeviss, 1941. THAILAND: 1, USNM 88374, Thailand, coll. H. M. Smith. 9, CAS (GVF), Samut Prakan Province, Gulf of Thailand, coll. Thai Fisheries. 1, ANSP 59919, Bangkok, coll. R. M. de Schaunensee. SINGAPORE: 1, MCZ 33209, Singapore. CEYLON: 2, BMNH 1933.12.27.1–2, Ceylon, coll. Harvard. INDIA: 3, BMNH 1890.12.4.14–16, Ganjam coast, ex. Indian Museum. 2, BMNH 1928.3.20.99–100, Orissa coast, ex. Indian Museum. 2, SOSC, Porto Novo. Madras, lat. 11°35′N, long. 79′50′E, coll. Anton Bruun, 1966. 1, SOSC, Bombay, Maharastra, lat. 18°50′N, long. 72°35′E, coll. Anton Bruun. I, SOSC, Porto Novo, Madras, lat. 11°30′N, long. 79°50′E.coll. Anton Bruun. 6, ZSI 124.20–25, Orissa coast, 7 fms, coll. Investigator. 1, ZSI 12617, Ganjam coast, coll. Investigator.

The puncticeps complex

The puncticeps complex has its center of distribution in the Indo-Australian Archipelago including northwest Australia, Philippines, the seas of India and Pakistan, and farther westward to the East Coast of Africa. This complex is closely related to the cynoglossus complex and both may have descended from a common ancestral stock.

The principal character that distinguishes this complex is the smaller size of its body scales, the interlinear scale rows being 14 to 19.

Included in this complex are C. puncticeps, C. durbanensis, and C. gilchristi.

33. Cynoglossus puncticeps (Richardson)

FIGURE 36; PLATE 15

Plagusia puncticeps Richardson, 1846:280 [type-locality: China].—Whitehead, 1969:218, pl. 29c.

Cynoglossus puncticeps.—Günther. 1862:500.—Bleeker, 1875: 37, pl. 245: 15, fig. 7.—Day, 1877:437, pl. 97: fig. 1; 1889:459.—Alcock, 1889:289.—Jordan and Seale, 1907:46.—Jenkins. 1910:30.—Norman, 1928:205.—Weber and de Beaufort, 1929:198.—Chu, 1931:94.—Herre, 1932:433.—Wu, 1932:151 [Amoy, Pehai, Canton, Hong Kong, and Hainan].—Smith, 1933:84.—Fowler, 1934b:220. fig. 34.—Suvatti, 1950:328.—Herre, 1953:190.—Munro. 1955:265, pl. 51: fig. 771.—Fowler, 1956:137.—De Silva, 1956:198 [Panadura].—Munro, 1958:285 [Kau Kau].—Kuronuma, 1961:32.—Punpoka, 1964:69 [Thailand].—Pradhan, 1964: 458.—Chen and Weng, 1965:91, fig. 62 [Tainan and Tungkong].—Shen, 1967:214, figs. 138–141 [Lamma Island].

Plagusia nigrolabeculata Richardson, 1846:280 [coasts of China. Canton].—Kaup, 1858:110.—Whitehead, 1969:218, pl. 29b.

Cynoglossus nigrolabecutatus.—Bleeker, 1873:131 [reference].

Plagusia aurolimbata Richardson, 1846:280 [coasts of China].—Kaup, 1858:110.—Whitehead, 1969:218, pl. 28b.

Cynoglossus aurolineatus.—Bleeker, 1873:130.

Plagusia javanica Bleeker, 1851a:414 [type-locality: Batavia]; 1852:24.

Arelia javanica.—Bleeker, 1859:184.

Plagusia brachyrhynchos Bleeker, 1851a:414 [type-locality: Batavia]; 1852:24.

Arelia brachyrhynchos.—Bleeker, 1859:184.

Cynoglossus brachyrhynchus.—Günther, 1862:499.—Bleeker, 1875:37, pl. 243: fig. 4.—Day, 1877:435, pl. 96: fig. 4; 1839:457.—Johnstone, 1904:206.—Weber, 1913b:443.

Cynoglossus brevis Günther, 1862:500 [type-locality: Ganges].—Day, 1877:437, pl. 97: fig. 2.—Alcock, 1889:289.—Hora, 1923b:760,—Norman, 1928:206.

Cynoglossus lida [not Bleeker].—Jenkins, 1910a:31.

Cynoglossus lida var. punctatus.—Jenkins, 1910a:30.

Cynoglossus puncticeps immaculata Pellegrin and Chevey, 1940:154 [Vietnam].

DESCRIPTION: Based on 87 specimens, 35.0–166.0 mm SL, including the paralectotype of C. brevis.

Depth of body 12.05–45.16 (M = 28.43), length of head 11.45–30.65 (M = 22.22) percent of standard length. Diameter of eye 6.25–16.13 (M = 10.71), interorbital space rather narrow, 0.36–6.67 (M = 3.03) percent of length of head. Two nostrils on ocular side, anterior nostrils tubular, in front of lower eye, posterior nostril simple, immediately in front of interorbital space. Snout rounded or obtusely pointed, 24.39–41.18 (M = 32.67) percent of length of head, rostral hook short, usually ends in front of anterior nostril, rarely reaching below anterior border of fixed eye. Maxillary extending to below middle or posterior half of fixed eye; angle of mouth extending to below vertical from anterior half or middle of fixed eye, usually nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 34.21–51.43 (M = 44.16), angle of mouth to branchial opening 41.67–72.73 (M = 55.62) percent of length of head.

FIGURE 36.—Lateral view of ocular side of three specimens of C. puncticeps showing variation in pigment pattern: a, specimen 143.5 mm SL (ZSI.F 5358/2) from Alleppey, Kerala; bf, specimens 110.6 and 1353 mm SL from Cochin coll. R. R. C. Edwards, Aberdeen.

Scales: Ctenoid on both sides, including those of lateral lines.

Lateral-Line System: Two lateral lines on ocular side, dorsolateral line slightly undulating, running backward and entering dorsal fin along 5th–6th ray, counted from the rear, midlateral line with 78–99 (M = 87) scales, 14–19 (M = 16) scales between them. No lateral line on blind side.

Interlinear scale rows

14

15

16

17

18

19

Frequencies

4

6

22

23

16

9

Fins: Dorsal with 90–100 (M = 96) rays, anal with 72–78 (M = 75) rays, caudal 10 in 57 specimens (radiographs).

Vertebrae: 44–49, comprising 9 abdominal and 35–40 caudal elements in 57 specimens (radiographs).

Coloration: Upper side brownish with dark blotches all over the body, appearing as somewhat irregular crossbands that disappear with age, lower whitish. Some of the rays of the vertical fins marked with dark brown.

Size: Largest specimen examined, 175 (161 + 14) mm, is from Sind, Pakistan.

DISTRIBUTION.—From northwest Australia, Malay Archipelago to Philippines, through South China Sea to Taiwan, and westward to seas of India; recorded from a depth of 7–75 fms and known from brackish waters as well.

DIAGNOSIS AND AFFINITIES.—The color pattern with large irregular blotches on the head and body, which are often united to form irregular crossbands, and some of the rays of the vertical fins with dark brown predominating are characteristic. Considerable variation from this pattern occurs, however, probably with changes in the nature of the substratum or intensity of light penetration. Cynoglossus puncticeps, which is replaced by C. durbanensis and C. gilchristi along the East Coast of Africa, is distinguished by 10 caudal fin rays whereas in the other species the number is only 8.

NOTE ON SYNONYMY.—Norman (1928:205) included P. javanica Bleeker and P. brachyrhynchos Bleeker in the synonymy of C. puncticeps and I concur with him. The additional names included here are P. nigrolabiculata Richardson, P. aurolimbata Richardson, C. brevis Günther, and C. p. immaculata Pellegrin and Chevey.

Richardson’s descriptions of P. puncticeps, P. aurolimbata, and P. nigrolabiculata were all based on Reeves Chinese fish drawings (see Whitehead, 1969). Fowler (1934b) synonymized the latter two species with C. puncticeps. I have examined Reeve’s original drawings of these species in the British Museum and found no significant difference between them.

Günther (1862:500) described C. brevis on the basis of a single specimen, 108 mm in TL, from the Ganges and characterized it with two lateral lines on left side separated by 17 scale rows. I have examined the holotype of C. brevis in the British Museum and I am convinced that differences in the proportional measurements such as the longer head length and longer snout in the type are attributable to intraspecific variations and that the two species are essentially the same in all respects including the color pattern, though considerable variation in pigmentation with age and change in the substratum is exhibited by the fish.

Pellegrin and Chevey described C. p. immaculata on the basis of a specimen from Bac Lieu, Cochin China. I have examined the holotype of C. p. immaculata in Paris and found it to exhibit no significant difference with C. puncticeps; C. p. immaculata is, therefore, synonymized here with C. puncticeps.

TYPE SPECIMENS.—Bleeker’s description of P. javanica was based on 17 specimens, 100–155 mm in TL. In the Bleeker collection in Leiden, cataloged as RMNH 6797, there are 20 specimens as C. puncticeps, obviously the specimens of P. javanica having been added to C. puncticeps after its synonymy. Out of the 20 specimens, 17 specimens, 90–109 (100–120) mm, are types and 3 specimens, 83–84 (91–92) mm, are nontypes. None of these agree with Bleeker’s upper size limit of 155 mm, which may well be erroneous. Dr. Boeseman examined the material on my behalf and selected a specimen of 90 mm SL, 100 mm TL, as the lectotype of P. javanica. It was retained as RMNH 6797 and the remaining 16 specimens were removed as paralectotypes of P. javanicus and recataloged as RMNH 26206.

Bleeker’s (1851a:414) description of P. brachyrhynchos was based on two specimens, 118 and 122 mm in TL, from Batavia. In the Bleeker collection specimens in Leiden cataloged as RMNH 6796, there are nine specimens one of which, 114 mm SL, 123 mm in TL, from Batavia, is selected as the lectotype of P. brachyrhynchos. The lectotype is retained as RMNH 6796 and the paralectotypes of 52–145 (56–? caudal mutilated) mm have been recataloged as RMNH 26207.

Holotype of C. brevis, BMNH 1855.12.26.602, 80 mm SL, from Ganges, ex. Zool. Society.

Holotype of Cynoglossus puncticeps Immaculata Pellegrin and Chevey, MNHP 40.39, from Bac Lieu, Cochin China.

OTHER MATERIAL EXAMINED.—CHINA: 2 specimens, BMNH 1848.3.16 194a,b, China. 2, BMNH 1850.3.19.916 a,b. China. 1, BMNH 1851.12.27.215, China. 1, BMNH 1851.12.27.344, China. 1, BMNH 1924.12.15.67, Hainan Is., coll. Light. 4, BMNH 1924.12.15.68–71, Amoy, coll. Light. 10, BMNH 1924.12.15.72–81, Santuao, coll. Light. 9, BMNH 1924.12. 15.80 a–h, Santuao, coll. Light. 1, BMNH 1930.7.28.16, Zingkow, coll. Chen. 2, BMNH 1930.7.28.14–15, Haikon, coll. Chen. 1, BMNH 1936.10.7.57, Foochow, coll. Chen. 4, USNM 6937, 6958, China. 1, UMMZ 70359, China, coll. Bead and Steeve.

PHILIPPINES: 1, BMNH 1872.10.18.133, Manila, coll. Meyer. 1, BMNH 1879.5.14.82. Philippines, coll. Challenger. 1, USNM 83075. Philippines. 1, USNM 1068026, Philippines, coll. H. C. Keller. 16, USNM 112871, 78–81, Philippines, coll. H. C. Keller. 1, USNM 113179, Philippines, coll. H. C. Keller. 18, USNM 137695–137703, Philippines, coll. H. C. Keller. 18, USNM 137695–137703, Philippines, coll. Albatross. 1, ANSP 635524, Philippines, coll. J. Clemense. 8, ANSP 82548, Philippines, coll. J. Clemense. 1. ANSP 82547, Philippines, coll. J. Clemense.

SINGAPORE: 1. BMNH 1933.12.27.6, Singapore, ex. Indian Museum. 2, BMNH 1933.7.31–32, Singapore, ex. Raffles Museum. 2, BMNH 1934.9.6.5–6, Singapore Mkt., ex. Raffles Museum. 10, BMNH 1934.11.21.9–18, Singlap, ex. Raffles Museum. 3, MCZ 11510, Singapore.

THAILAND: 1, USNM 109799, Gulf of Thailand, coll. H. M. Smith. 4. ANSP 61837, Paknam. 5, ANSP 61843–55, Paknam, coll. R. de Schanenam. 1, ANSP 61842, Paknam, coll. R. de Schanenam. 2, ANSP 61852–53, Bangkok, coll. R. de Schanenam. 1, ANSP 61841, Bangkok, coll. R. de Schanenam. 2. ANSP 61852–53, Bangkok, coll. R. de Schanenam. 1, ANSP 61841, Bangkok, coll. R. de Schanenam. 1, ANSP 61854, Bangkok, coll. R. de Schanenam. 2, ANSP 87437, Bangkok, coll. R. de Schanenam. 1, CAS (GVF). Gulf of Thailand, coll. Naga Expd.

BORNEO: 1, BMNH 1894.1.19.1932, Brumal (Sarawak), coll. Brooke.

INDONESIA: 1, BMNH 1931.4.21.47, Java, coll. Hardenberg. I, BMNH 1931.4.23.46, Batavia Mkt., coll. Hardenberg. 1, ZMA 108.002, Indonesia, coll. Tydeman. 5, UMMZ (unregistered), Java. 2, AMNH 18414, Java. 1, NHV 43806, Java, coll. E. Novara. BURMA: 1, ZSI 1462, Moulmein, coll. F. Day.

INDIA: 1, BMNH 1852.9.13.235 B, Ganges, ex. Zool. Soc. 1, BMNH 1855.9.19.47, locality unknown, coll. Haslar. 1, BMNH 1862.6.3.15, locality unknown, coll. P. Bleeker. 1, BMNH 1862.6.3.20, locality unknown, coll. P. Bleeker. 1, BMNH 1889.2.1.4069, Bombay, coll. F. Day. 1, BMNH 18895.1.4072, Andamans, coll. F. Day. 1, BMNH 1889.2.1. 4075. Calcutta, coll. F. Day. 1, BMNH 1928.3.20.113, Trivandrum, ex. Indian Museum. 1, BMNH 1928.20.114. Trivandrum, Travancore, ex. Indian Museum. 4. BMNH 1928.3.20.115–118, Ganjam coast, ex. Indian Museum. 2, BMNH 1928.3.20.119–120, Ganjam coast, 7–14 fms, ex. Indian Museum. 2, BMNH 1928.350.121–122. Chilka Lake, ex. Indian Museum. 1, BMNH 1928.3.20.123. Chilka Lake, ex. Indian Museum. 5, BMNH 1928.3.20.124–128, Chilka Lake, ex. Indian Museum. 2, BMNH 1928.3.20.129–30, Orissa coast, 7 fans, ex. Indian Museum. 1, BMNH 1928.3.20.131, Ganjam coast, 8–9 fms, ex. Indian Museum. 1, BMNH 1933.15–7, Calicut, Malabar, coll. Devanean. 2, BMNH 19383.9.11.12, Calicut, coll. Devanean. 1, ZSI 139, Travancore, coll. F. Day. 2, ZSI 161 and 282, Goa, coll. S. W. Kemp. 1, ZSI 463, Calcutta bazar, ex. Asiatic Society. 1, ZSI 1147. Calicut, coll. F. Day. 1. ZSI 1148. Bombay, coll. F. Day. 1, ZSI 1459, Calcutta, coll. F. Day. 1. ZSI 2691, Calcutta, coll. F. Day. 1, ZSI 2693, Madras, coll. F. Day. 2, ZSI 12167, Orissa coast, coll. Marine Survey. 2. ZSI 12235 and 12673, Ganjam coast, Orissa, coll. Marine Survey. 8, ZSI 12658–63 to 70, Ganjam coast, coll. Marine Survey. 1, ZSI 12674, Ganjam coast, 4–14 fms, coll. Marine Survey. 2, , Trivandrum, ex. Trivandrum Museum. 2, ZSI , Calcutta bazar, ex. Asiatic Society. 1, , Calcutta bazar, ex. Asiatic Society. 1, , 5 mi SE of Geokale, Patashmipur, Chilka Lake, Orissa, coll. K. S. Misra. 6, , S of Cherrvakuda Is., 4 mi NE of Ramba, Chilka Lake, Orissa, coll. K. S. Misra. 5, , North Ernakulam Back Waters, coll. F. H. Gravely. 10, ZSI (unregistered), Kerala, coll. A. G. K. Menon. 9, ZSI (unregistered), Barkul, Chilka Lake, coll. Chilka Survey, 1.3.1914. 1, ZSI (unregistered), Barkul, Chilka, coll. Chilka Survey, 5.3.1914. 2, ZSI (unregistered), S of Kalidai, Chilka Lake, coll. Chilka Survey, 5.3.1941. 1, ZSI (unregistered), Kalidai, Chilka Lake, coll. Chilka Survey, 215.1941. 14, ZSI (unregistered), Channel off Barhampore, Chilka Lake, coll. Chilka Survey, 2.9.1914. I, ZSI (unregistered), Gopkuda Bay, Chilka Lake, coll. Chilka Survey, 145.1914. 5, ZSI (unregistered), Channel of Satpara, coll. Chilka Survey. 1, ZSI (unregistered), Kalupara Ghat, Chilka Lake, coll. Chilka Survey. 1, ZSI (unregistered), Patashnipur, Chilka Lake, coll. Chilka Survey, 12.3.1914. 1, ZSI (unregistered). Long Is., near Manipatna, Chilka Lake, coll. Chilka Survey. 1, ZSI (unregistered), Cheriya Is. to Barkuda Is. across mouth of Rambha Bay, coll. Chilka Survey, 1914. 1, ZSI (unregistered), Barkuda Is., Chilka Lake, coll. Chilka Survey, 175.1914. 1. ZSI (unregistered), Cheriya Is. Bay, Chilka Lake, coll. Chilka Survey. 1. ZSI (unregistered), channel between Satpara and Barikuda, Chilka Lake, coll. Chilka Survey. 4, ZSI (unregistered), W of Satpara, Chilka Lake, coll. Chilka Survey. 2, ZSI (unregistered). Cochin, coll. Edward. 4, ZSI (unregistered), Cochin, coll. Dr. A. Daniel, 22.9.1960. 2, ZSI (unregistered), Cochin, coll. Dr. Quasim. 1, ZSI (unregistered), Aleppy, Kerala, coll. Chakrapany. 1, ZSI (unregistered), Travancore, coll. Dr. E. G. Silas. I, ZSI (unregistered), Karwar, coll. K. K. Tiwari. 1, SOSC, Madras, coll. Anion Bruun. 1. ANSP 74855, Calcutta. 1. NHV 43770, Calcutta, coll. F. Day.

PAKISTAN: 1, BMNH 1889.2.1.4068, Sind. coll. F. Day. 2, BMNH 1911.12.6.17.18. Karachi, coll. Townsend. 1, NHV 4S772, Sind, coll. F. Day.

34. Cynoglossus durbanensis Regan

FIGURE 37; PLATE 15

Cynoglossus durbanensis Regan, 1921a:2 [type-locality: Durban, South Africa].—Bonde. 1922:25.—Barnard, 1925: 412.—Smith, 1949:165.

DESCRIPTION.—Based on 7 specimens, 88.5–182.0 mm SL, including the lectotype and paralectotype of C. durbanensis.

Depth of body, 25.82–30.88 (M = 28.31), length of head 17.43–20.90 (M = 18.95) percent of standard length. Diameter of eye 8.20–10.87 (M = 9.78), interorbital space 6.38–10.81 (M = 8.67) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in front of interorbital space. Snout obtusely rounded, 23.40–33.96 (M = 30.20) percent of length of head, rostral hook short, ends in front of anterior nostril. Maxillary extending to below posterior half of fixed eye; angle of mouth extending below vertical from middle or posterior half of fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 40.43–49.06 (M = 43.70), angle of mouth to branchial opening 55.32–63.04 (M = 58.11) percent of length of head.

Scales: Ctenoid on both sides, including those of lateral lines.

Lateral-Line System: Two lateral lines on ocular side, dorsolateral line usually entering dorsal fin along 3rd–5th ray counted from the rear, midlateral line with 90–106 (M = 99) scales, 18–21 (M = 20) scales between them. No lateral line on blind side.

Interlinear scale rows

18

19

20

21

Frequencies

1

1

4

1

Fins: Dorsal with 98–105 (M = 102) rays, anal with 78–84 (M = 81) rays, caudal 8(9) in 5 specimens (radiographs).

Vertebrae: 48–50, comprising 9 abdominal and 39–41 caudal elements in 5 specimens (radiographs).

Coloration: Light brownish with darker irregular blotches and dots in preserved material.

Size: Largest specimen examined (lectotype) is 184 (170 + 14) mm from Durban.

DISTRIBUTION.—Africa (Natal to Zanzibar).

DIAGNOSIS AND AFFINITIES.—The nearest relative of C. durbanensis is C. gilchristi. The features that distinguish this species are: the deeper body (mean depth 28.31 percent of SL cf. 27.16 percent), smaller eyes (mean diameter 9.78 percent of head cf. 11.56 percent), wider interorbital space (mean width 8.67 percent of head cf. 6.22 percent), and smaller body scales, the interlinear scale rows being 18–21, M = 19, whereas in C. gilchristi there are only 14–15, M = 14.

TYPE SPECIMENS.—BMNH 1920.7.23.37, 170 mm SL, from Durban, coll. H. W. B. Marley, an excellent example of the species, is selected here as the lectotype of C. durbanensis and BMNH 1920.7.23. 38, 152 mm SL, collected along with the lectotype as the paralectotype.

FIGURE 37.—Outline drawing of C. durbanensis (BMNH 1922.5.5.20) from Lumbo.

OTHER MATERIAL EXAMINED.—1 specimen, BMNH 1920.12. 6.30, Durban, ex. Transvaal Museum. 1, BMNH 1922.5.550, Lumbo, E Africa, coll. Laveridge. 1, ANSP 63890, Durban, coll. H. W. Bell Marley, 1935. 1, ANSP 87113, Natal coast, coll. H. W. Bell Marley. 1935. 3, MCZ 11519, Zanzibar, coll. Cooke.

35. Cynoglossus gilchristi Regan

FIGURE 38; PLATE 16

Cynoglossus brachycephalus [not Bleeker].—Gilchrist, 1905:12, pl. 30.—Bonde, 1922:25.—Gilchrist and Thompson, 1917:399.

Cynoglossus gilchristi Regan, 1920:222 [type-locality: Natal, off mouth of Umhlanga River].—Barnard, 1925:412.—Bonde, 1925:294.

Cynoglossoides gilchristi.—Smith, 1949:165, fig. 337.

DESCRIPTION.—Based on 4 specimens, 44.0–133.0 mm SL, including the holotype of C. gilchristi.

Depth of body 24.81–28.73 (M = 27.16), length of head 18.0–23.86 (M = 21.58) percent of standard length. Diameter of eye 8.0–18.18 (M = 11.56), interorbital space 4.55–7.89 (M = 6.22) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in front of the interorbital space. Snout rounded, 26.0–31.82 (M = 28.84) percent of length of head, rostral hook rather short, ends below anterior nostril or just in front of it. Maxillary extending to below middle or posterior half of fixed eye; angle of mouth extending to below vertical from anterior half or middle of fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 44.0–47.62 (M = 46.11), angle of mouth to branchial opening 54.55–57.89 (M = 56.40) percent of length of head.

Scales: Ctenoid on both sides, including those of lateral lines.

Lateral-Line System: Two lateral lines on ocular side, dorsolateral line more or less undulated, generally stopping at four-fifths of length of the body and becoming obscure; midlateral line with 74–80 (M = 77) scales, 14–15 (M = 15) scales between them. No lateral line on blind side.

Interlinear scale rows

14

15

Frequencies

1

3

Fins: Dorsal with 104–110 (M = 106) rays, anal with 82–86 (M = 84) rays, caudal 8 in 3 specimens (radiographs).

Vertebrae: 50 comprising of 9 abdominal, 49 caudal elements in 3 specimens (radiographs).

Coloration: Upper side light brown with irregular darker blotches, lower whitish in preserved specimens.

Size: Largest specimen examined (holotype), 141 (133 + 8) mm, is from Natal.

DISTRIBUTION.—From Natal and Delagoa Bay to Nossi Be, Madagascar; recorded from depths of 4–30 fms.

DIAGNOSIS AND AFFINITIES.—Cynoglossus gilchristi is closely related to C. durbanensis; the differences distinguishing it from C. durbanensis are outlined under C. durbanensis.

TYPE SPECIMENS.—Holotype of C. gilchristi, BMNH 1903.9.29.2,133 mm SL, Umlanga R, Natal, S Africa, coll. Gilchrist.

FIGURE 38.—Outline drawing of C. gilchristi, holotype (BMNH 1903.9.29.2) from Natal.

OTHER MATERIAL EXAMINED.—3 specimens, SOSC Ref 134, Nossi Be, Madagascar, lat. 13°20′50″S, long. 48° 19′50″E, coll. Te-vega Expd.

The lida complex

Cynoglossus lida, the only species forming the lida complex, is characterized by a broadly round prominent snout, the angle of the mouth being distinctly nearer to the branchial opening than to the tip of the snout and the rostral hook extending to as far below the middle of the fixed eye. In all other features it appears to be closely related to the puncticeps complex and may have evolved from a common ancestral stock.

36. Cynoglossus lida (Bleeker)

FIGURE 39; PLATE 16

Plagusia lida Bleeker, 1851a:413 [type-locality: Batavia]; 1852:23.

Arelia lida.—Bleeker, 1859:184.

Cynoglossus lida.—Günther, 1862:498.—Bleeker, 1875:36, pl. 243: fig. 2.—Day, 1877:436, pl. 97: fig. 3; 1889:458.—Alcock, 1889:288.—Vindguena, 1889:188.—Jenkins, 1910a: SO.—Regan, 1920:221, fig. 5 [Durban].—Bónde, 1922:25.—Barnard, 1925:411 [Natal coast].—Fowler, 1925:187[Natal].—Norman. 1928:210.—Weber and de Beaufort. 1929:203.—Smith, 1933:83.—Fowler, 1935:405 [Natal and Zululand].—Smith, 1949:166.—Herre, 1953:190.—Munro, 1955:206.—Silva, 1956:199.—Fowler, 1956:187, fig. 102.—Punpoka, 1964:61.—Chen and Weng, 1965:94 [Taiwan].

Piagusia polytaenia Bleeker, 1853c:529 [type-locality: Priaman].

Arelia polytaenia.—Bleeker, 1859:185.

Cynoglossus polytaenia.—Bleeker, 1875:36, pl. 244: fig. 1.—Weber and de Beaufort. 1929:201.

Cynoglossus intermedins Alcock, 1889:288.

Cynoglossus os Fowler, 1904:556 [type-locality: Padang, Sumatra].

DESCRIPTION.—Based on 23 specimens, 45.0–200.0 mm SL, including the holotype of C. intermedius.

Depth of body 21.92–27.55 (M = 23.78), length of head 21.15–25.56 (M = 23.30) percent of standard length. Diameter of eye 3.70–8.89 (M = 6.32), interorbital space 3.19–7.41 (M = 3.93) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in anterior half of interorbital space. Snout rounded, 30.43–43.33 (M = 37.99) percent of length of head, rostral hook rather long, extending to as far as below middle of fixed eye. Maxillary extending to below posterior border of fixed eye, or just behind it; angle of mouth extending to below vertical from posterior half of fixed eye, nearer to branchial opening than to tip of snout; tip of snout to angle of mouth 44.44–57.45 (M = 53.03), angle of mouth to branchial opening 41.57–55.56 (M = 46.55) percent of length of head.

Scales: Ctenoid on both sides.

Lateral-Line System: Two lateral lines on ocular side, midlateral line with 72–90 (M = 80) scales, 12–15 (M = 13) scales between middle and upper lateral line. No lateral line on blind side.

Interlinear scale rows

12

13

14

15

Frequencies

16

37

20

2

Fins: Dorsal with 99–108 (M = 105) rays, anal with 77–85 (M = 81) rays, caudal 10 in 57 specimens (radiographs).

Vertebrae: 47–52, comprising 9 abdominal and 38–43 caudal elements in 57 specimens (radiographs).

Coloration: Upper side light brownish, lower whitish in preserved specimens.

Size: Largest specimen examined is 213.0 (200 + 13) mm, trawled by Anton Bruun.

DISTRIBUTION.—From Malay-Archipelago and Philippines through seas of India and Pakistan to East Coast of Africa; recorded from a depth of 13–15 fms.

FIGURE 39.—Outline drawing of C. lida (BMNH 1919.9.12.50) from Durban.

DIAGNOSIS AND AFFINITIES.—Superficially C. lida resembles C. puncticeps in many morphometric characters. It is distinguishable, however, by the lack of dark irregular blotches on the body and the dark brown marking of some of the rays of the vertical fins and by the shape of its broadly rounded snout (mean length 37.99 cf. 32.67 percent of head). It is also characterized by the rictus of the mouth being much nearer to the gill opening than to the end of snout (mean distance from rictus of mouth to gill opening 46.55 percent of head cf. 55.62 percent of head).

NOTE ON SYNONYMY.—Bleeker’s description of P. lida was on the basis of five specimens, 100–145 mm in TL, from Batavia. He characterized it as having two lateral Unes on the left side separated by 13 series of scales and having the angle of the mouth nearer to the gill opening than to the end of the snout. Norman (1928:210) synonymized C. intermedius Alcock with C. lida. I have examined the holotype of C. intermedins in the Zoological Survey of India and find that the differences noted by Alcock in the type of C. intermedius, such as the more numerous, weakly ctenoid scales and the longer head, are attributable to intraspecific variation and that they are conspecific. Günther (1862: 498) considered P. polytaenia Bleeker (1853e:529) conspecific with P. lida though Weber and de Beaufort (1929:201) retained it as a separate species from C. lida. I examined a specimen, BMNH 1862. 6.3.14, of P. polytaenia from the Bleeker collection in London and found it to conform well with Bleeker’s description and figure of P. lida. Fowler (1904:556) described C. os based on a single specimen from Pedang. I have not been able to locate the type in Philadelphia (pers. comm., Dr. James C. Tyler), but from the description it is found to exhibit no significant difference from P. lida.

TYPE SPECIMENS.—Among Bleeker’s material in Leiden is one obviously composite lot (RMNH 6791) of 6 specimens, including the 5 syntypes of P. lida (pers. comm., Dr. M. Boeseman). Since Bleeker in his Atlas (1875:6, pl. 243: fig. 2) gave the illustration of a specimen measuring 145 mm in TL, obviously the largest specimens in the syntype series, a specimen 134 mm SL, approximately 145 mm in TL, in the lot RMNH 6791, is selected as lectotype of P. lida and retained in RMNH 6791. The other five examples, 91–126 (100–136) mm, recataloged as RMNH 26208, include 4 paralectotypes of P. lida.

Bleeker described P. polytaenia on the basis of a single specimen, 107 mm in TL, from Priaman, Sumatra. Among the Bleeker collection in Leiden is a specimen 100 mm in SL, 107 mm in TL, indicated as holotype, RMNH 6790, presumably by Chabanaud (pers. comm., Dr. Boeseman).

Holotype of C. intermedius, ZSI 12246, 192.5 mm SL, Orissa coast, coll. Marine Survey.

OTHER MATERIAL EXAMINED.—PHILIPPINES: 1 specimen, BMNH 1872.4.6.96, Celebes, coll. Meyer. 12. USNM (unregistered), Philippines, coll. Albatross, 1907–09. 5, USNM 137955–59, Philippines, coll. Albatross. 9, USNM (unregistered). Philippines, coll. Albatross. INDONESIA: 1, BMNH 1862.6.3.14, locality not given, coll. P. Bleeker. 1. BMNH 1862.6.3.16, locality not given, coll. P. Bleeker. 1, ZMA OR-276101, Indonesia. BURMA: 1, BMNH 1889.2.1.4064. Sit-toung, coll. F. Day. 1, ZSI 2688, Burma, coll. F. Day. INDIA: 1, BMNH 1928.3.20.129–30, Orissa coast, ex. Indian Museum. 1. BMNH 1928.3.20.31, Ganjam coast, ex. Indian Museum. 2, ZSI 12259–60, Orissa coast, coll. Marine Survey. 2, ZSI 12684–85, Orissa coast, coll. Marine Survey. 2,, and , Tranquebar, E coast, India, coll. A. G. K. Menon. 1, ZSI , Kilingimedu, Karaikkal, coll. A. G. K. Menon. 1, , Sonakuppam. Cudda lore. coll. A. G. K. Menon. 28, SOSC Ref 170. Madras, coll. Anton Bruun. AFRICA: 1, BMNH 1919.9.12.50, Durban, coll. Marley. 13, SOSC Ref 170, Mozambique coast, lat. 19°09′S, long. 36°30′E. coll. Anton Bruun. 8, SOSC Ref 170, NW coast of Madagascar, coll. Anton Bruun. 1, SOSC Ref 170, Mozambique coast, coll. Anton Bruun. 2, ANSP 64104ߝ 05, Mozambique, coll. Albatross. 1, ANSP 84664, Natal, coll. H. W. Bell Marley. 1, ANSP 86319, Natal, coll. H. W. Bell Marley. 2, MCA 34108, Mozambique, coll. T. Barbous. 1, RU 275565, Inhaca., coll. J. L. B. Smith.

The carpenteri group

This group is basically a natural assemblage of specialized, lately evolved species of cynoglossus. The principal characters distinguishing this group are three lateral lines on the ocular side, none on the blind side, two nostrils on ocular side, snout long and pointed, with the angle of mouth situated nearer to branchial opening than to tip of snout, small eyes usually with a narrow interorbital space (absent in C. suyeni), small scales, the interlinear scale count being 15–22. The species of this group are distributed on one hand in the Philippines through Celebes to the Timor Sea and on the other in the seas of India and Pakistan to the East Coast of Africa. This group is most probably derived from a cynoglossus-like ancestor through elongation of the body (especially the snout), reduction in the size of the body scales, and addition of a ventrolateral line on the ocular side.

The carpenteri complex

Cynoglossus carpenteri, C. acutirostris, C. marleyi, and C. suyeni form the carpenteri complex, which is the only complex under the carpenteri group. The characteristics of the complex are, therefore, the same as given above for the group.

37. Cynoglossus carpenteri Alcock

FIGURE 40; PLATE 17

Cynoglossus carpenteri Alcock, 1889:287, pl. 18: fig. 1 [type-locality: Orissa coast]; 1890a:217; 1896:330; 1898, pl. 22: fig. 5; 1899:133.—Boulenger, 1901:26S.—Regan, 1905b:329.—Norman, 1928:196.—Saramma, 1963:75 [Kerala coast].

DESCRIPTION.—Based on 21 specimens, 60.0–181.0 mm SL, including lectotype and paralectotype of C. carpenteri.

Depth of body 23.81–29.5 (M = 26.66), length of head 27.61–33.87 (M = 29.85) percent of standard length. Diameter of eye 6.33–10.53 (M = 8.56), interorbital space 2.08–6.56 (M = 3.74) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in front of interorbital space. Snout obtusely pointed, 30.85–36.84 (M = 33.32) percent of head; rostral hook rather short, extends up to a point from anterior nostril to anterior border of fixed eye. Maxillary extending to well beyond fixed eye; angle of mouth extending to below vertical from posterior border of fixed eye or little beyond it, either slightly nearer to branchial opening than to tip of snout or midway between these two; tip of snout to angle of mouth 39.02–56.10 (M = 50.76), angle of mouth to branchial opening 47.37–54.55 (M = 48.78) percent of length of head.

Scales: Cycloid on ocular side with ctenoid scales posteriorly, cycloid on blind side.

Lateral-Line System: Three lateral lines on ocular side, both dorsolateral and ventrolateral lines usually entering dorsal and anal fins respectively at a very short distance from caudal base, midlateral line with 75–96 scales, 15–19 (M = 16) scales between them. No lateral line on blind side.

Interlinear scale rows

15

16

17

18

19

Frequencies

10

14

4

1

1

Fins: Dorsal with 101–110 (M = 107) rays, anal with 80–89 (M = 84) rays, caudal 10 in 12 specimens (radiographs).

Vertebrae: 51–55 comprising 9 abdominal and 42–46 caudal elements in 12 specimens (radiographs).

Coloration: Upper side uniformly brownish, opercular region rather blackish, lower whitish in preserved specimens.

Size: Largest specimen examined, 230 (212 + 18) mm, is from the Indian Ocean trawled by Anton Bruun.

FIGURE 40.—Outline drawing of C. carpenteri (BMNH 1928.3.20.75) from Bay of Bengal.

DISTRIBUTION.—Seas of India to Persian Gulf; trawled from a depth of 68–230 fms.

DIAGNOSIS AND AFFINITIES.—Cynoglossus carpenteri, C. acutirostris, C. marleyi, and C. suyeni are four allopatric species that resemble each other in the small, and closely placed eyes, wide mouth cleft extending below or beyond the posterior border of fixed eye, and long pointed snout, all specifications for living on a sandy or muddy bottom and plowing or burrowing into the substratum for feeding. Cynoglossus carpenteri is closely related to C. acutirostris but can be separated from it by its shorter snout (33.2 percent cf. 43.46 percent of head) and somewhat larger scales (15–19 cf. 18–20 interlinear rows).

TYPE SPECIMENS.—A specimen, ZSI 12434, 148 mm SL, from Orissa coast, coll. Marine Survey, is here selected as the lectotype of C. carpenteri and a specimen, ZSI 12433, 141.5 mm SL, collected along with the lectotype as the paralectotype.

OTHER MATERIAL EXAMINED.—INDIA: 6 specimens, ZSI 12727, Bay of Bengal, 98–102 fms, coll. Marine Survey. 6, ZSI 12728, Bay of Bengal, 98–102 fms, coll. Marine Survey. 6, ZSI 13589–94, Bay of Bengal, coll. Marine Survey. 9, ZSI F 647/1–656/1, off Calicut coast, 100 fms, coll. Marine Survey. 6, ZSI F 1275/1–1280/1, Arabian Sea, 156–200 fms, coll. Marine Survey. 3, BMNH 1890.7.31.10–12, Ganjam coast, lat. 18°30′N, long. 84°36′E, coll. Marine Survey. 3, BMNH 1890.11.28.27–29, Ganjam coast, lat. 18°30′N, long. 84°46′E, coll. Marine Survey. I, BMNH 1928.3.20.74, Arabian Sea, 156–200 fms, ex. Indian Museum. 3, BMNH 1928.3.20. 75–77, Bay of Bengal, 28–102 fms, ex. Indian Museum. 3, BMNH 1928.3.20.78–80, off Calicut coast, 100 fms, coll. Marine Survey. 53, SOSC Ref 23, Arabian Sea, lat. 24°13′N, long. 65°52′E, 93 fms, coll. Anton Bruun. 1, SOSC Ref 23, Arabian Sea, lat. 24°10′N, long. 65°54′E, 126 fms, coll. Anton Bruun. 19, SOSC Ref 23, Arabian Sea, lat. 23°1S′N, long. 66°40′E, 100 fms, coll. Anton Bruun. 18, SOSC Ref 23, Arabian Sea, lat. 24°55′N, long. 61′10′E, 100 fms, coll. Anton Bruun. 116, SOSC Ref 23, Arabian Sea, lat. 24°13′N, long. 65–52′E, coll. Anton Bruun. 2, USNM 44418, Bay of Bengal, coll. RIMS Investigator. OMAN: 4, ZSI F 1160/1–63/1, Gulf of Oman. 230 fms, coll. Marine Survey. 3, BMNH 1901.1.30–32, Sea of Oman, 24°59߰N, 60°58′E, 100 fms. coll. Tounsend. 2, BMNH 1901.1.81.14–15, Gulf of Oman, 25°35′N, 57°47′E, 170 fms, coll. Tounsend. 1, BMNH 1939.5.24.1799, Gulf of Oman, 196 fms, coll. John Murray Expd. PERSIA: 3, BMNH 1903.7.8.24–26, Persian Gulf, 15 fms, coll. Tounsend.

38. Cynoglossus acutirostris Norman

FIGURE 41; PLATE 17

Cynoglossus (Areliscus) acutirostris Norman, 1939:104, fig. 35 [type-locality: Gulf of Aden].

DESCRIPTION.—Based on 11 specimens, 182.0–238.0 mm SL, including lectotype and paralectotypes of C. acutirostris.

Depth of body 26.29–30.53 (M = 28.40), length of head 23.11–27.47 (M = 26.04) percent of standard length. Diameter of eye 6.14–9.71 (M = 7.95), interorbital space rather narrow, 0.91–3.88 (M = 1.92) percent of length of head. Two nostrils on ocular side, anterior nostril tubular in front of fixed eye, posterior nostril simple, immediately in front of interorbital space. Snout acutely pointed, 37.74–48.54 (M = 43.46) percent of head; rostral hook rather long, reaches below anterior border of fixed eye. Maxillary extending beyond fixed eye; angle of mouth extending to below vertical from posterior border of fixed eye or just beyond, much nearer to branchial opening than to tip of snout, tip of snout to angle of mouth 52.83–65.05 (M = 58.40), angle of mouth to branchial opening 35.79–45.28 (M = 39.90) percent of length of head.

Scales: Cycloid on ocular side with ctenoid scales posteriorly; cycloid on blind side.

Lateral-Line System: Three lateral lines on ocular side, both dorsolateral and ventrolateral lines slightly undulating and entering dorsal and anal fins, respectively, at a very short distance from caudal base; midlateral line with 84–92 (M = 87) scales, 18–20 (M = 19) scales between them. No lateral line on blind side.

Interlinear scale rows

18

19

20

Frequencies

5

4

2

Fins: Dorsal with 110 rays, anal with 94 rays, caudal 10 in 1 specimen (radiograph).

Vertebrae: 58, comprising 9 abdominal and 49 caudal elements in 1 specimen (radiograph).

Coloration: Upper side uniformly brownish, lower whitish in preserved specimens.

Size: Largest specimen examined, 254 (238 + 16) mm, is one of the type specimens from Gulf of Aden.

DISTRIBUTION.—Gulf of Aden; trawled from a depth of about 120 fms.

DIAGNOSIS AND AFFINITIES.—The acutely pointed long snout is unique among the species of the genus Cynoglossus and serves as a ready diagnostic character. In most other characters C. acutirostris is very similar to C. carpenteri.

TYPE SPECIMENS.—A specimen, BMNH 1939.5. 24.1800, 238 mm SL, from Gulf of Aden, coll. John Murray Expd. is here selected as the lectotype of C. acutirostris and 9 specimens, BMNH 1939.5.24.1801–1809, 182–238 mm SL, collected along with the lectotype and a specimen, USNM 109493, 190 mm SL, also collected along with the lectotype are the paralectotypes.

FIGURE 41.—C. acutirostris, lectotype (BMNH 19S9.5.24.800): a, outline drawing of lateral view of ocular side; b, details of head of blind side.

39. Cynoglossus marleyi Regan

FIGURE 42; PLATE 18

Cynoglossus (Trulla) marleyi Regan, 1921b:418 [type-locality: off Umvoti River, Natal].

Areliscus marleyi.—Bonde, 1922:25.—Barnard, 1925:414.—Fowler. 1925:187.—Bonde, 1925:292.—Fowler, 1935:361.—Barnard, 1937:41.—Smith, 1949:166.

DESCRIPTION.—Based on 2 specimens, 162.0–316.0 mm SL, including the holotype of C. marleyi.

Depth of body 21.60–25.63 (M = 23.62), length of head 18.0–20.68 (M= 19.34) percent of standard length. Diameter of eye 7.0–8.96 (M = 7.98), interorbital space 2.63–4.48 (M = 3.56) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in anterior half of interorbital space. Snout pointed, 38.81–45.61 (M = 42.41) percent of length of head; rostral hook rather long, reaches below fixed eye. Maxillary extending to below posterior border of fixed eye, or a little beyond it, angle of mouth extending to below vertical from posterior border of fixed eye, nearer to branchial opening than to tip of snout; tip of snout to angle of mouth 52.24–59.65 (M = 55.95), angle of mouth to branchial opening 40.30–47.37 (M = 43.34) percent of length of head.

FIGURE 42.—Outline drawing of C. marleyi, holotype (BMNH 1921.3.1.21) from Natal.

Scales: Ctenoid on both sides.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 112–113 scales, 18–19 scales between middle and upper lateral lines. No lateral line on blind side.

Interlinear scale rows

18

19

Frequencies

1

2

Fins: Dorsal with 126 rays, anal with 105 rays, caudal 10 in 1 specimen (radiograph).

Vertebrae: 62, comprising 9 abdominal and 53 caudal elements in 1 specimen (radiograph).

Coloration: Upper side uniform brown, lower whitish in preserved specimens.

Size: Largest specimen examined, 336 (316 + 20) mm, is the holotype from Natal.

DISTRIBUTION.—Durban to Delagoa Bay; recorded from depths of 30–150 fms.

DIAGNOSIS AND AFFINITIES.—Cynoglossus marleyi, which is restricted in its distribution to South Africa, is related to C. carpenteri and is undoubtedly evolved from a carpenteri-like ancestor. The ctenoid scales on the ocular side and the more elongate snout (mean length 42.21 percent of head cf. 33–32 percent) distinguish it from C. carpenteri.

TYPE SPECIMENS.—Holotype of C. marleyi, BMNH 1921.3.1.21, 316 mm SL, from Natal, 130 fms, coll. Marley.

OTHER MATERIAL EXAMINED.—1 specimen, 160 mm SL, from off Natal coast, lat. 29°27′S, long. 31°31′E, coll. Anton Bruun, 25.9.64.

40. Cynoglossus suyeni Fowler

PLATE 18

Cynoglossus xiphoideus [not Günther].—Weber, 1913b:441.—Weber and de Beaufort, 1929:193 [Timor Sea].

Cynoglossus suyeni Fowler, 1934a:347, fig. 101 [type-locality: Mindora Is., Philippines].

Cynoglossus beauforti Chabanaud, 1951c:3, figs. 2, 3 [type-locality: Timor Sea].

DESCRIPTION.—Based on 20 specimens, 110.0–257.0 mm SL, including the holotypes of C. suyeni and C. beauforti.

Depth of body 19.29–25.25 (M = 22.59), length of head 19.39–23.23 (M = 21.13) percent of standard length. Diameter of eye 6.67–12.28 (M = 9.10) percent of length of head, interorbital space mostly absent, or very narrow. Two nostrils on ocular side, anterior nostril tubular in front of lower eye, posterior nostril simple, in anterior part of interorbital space. Snout rather pointed, 38.46–46.34 (M = 42.97) percent of length of head; rostral hook long, reaches below anterior border of fixed eye. Maxillary extending well beyond fixed eye; angle of mouth extending just behind vertical from posterior border of fixed eye, nearer to branchial opening than to tip of snout; tip of snout to angle of mouth 53.33–60.98 (M = 57.61), angle of mouth to branchial opening 39.02–48.31 (M = 44.05) percent of length of head.

Scales: Ctenoid on both sides.

Lateral-Line System: Three lateral lines on ocular side; midlateral line with 102–126 (M = 114) scales, 19–22 (M = 20) scales between middle and upper lateral lines. No lateral line on blind side.

Interlinear scale rows

19

20

21

22

Frequencies

4

9

3

1

Fins: Dorsal with 115–126 (M = 110) rays, anal with 92–105 (M = 91) rays, caudal 10 in 9 specimens (radiographs).

Vertebrae: 57–61, comprising 9 abdominal and 48–52 caudal elements in 9 specimens (radiographs).

Coloration: Upper side uniformly brownish, lower whitish in preserved specimens.

Size: Largest specimen examined, 275 (257 + 18) mm, is from Philippine-Celebes area, trawled by Albatross.

DISTRIBUTION.—From Philippines through Celebes to the Timor Sea; trawled from a depth of 173 fms.

DIAGNOSIS AND AFFINITIES.—Cynaglossus suyeni, which is restricted to the deeper waters off Mindanao Island southward through the Celebes Sea to the Timor Sea, is closely related to C. carpenteri and has undoubtedly evolved from a carpenteri-like ancestor. It can be readily separated from C. carpenteri by the nature and position of its eyes, which are scaly and contiguous. The ctenoid scales on the ocular side and the longer snout (mean length 42.97 percent of head cf. 33.2 percent) further distinguish it from C. carpenteri. The scaly covered contiguous eyes are considered a further specialization for a burrowing mode of life.

NOTE ON SYNONYMY.—Cynoglossus beauforti Chabanaud (1951c) was described based on a specimen obtained from the Timor Sea by the Siboga Expedition and included under C. xiphoideus by Max Weber (1931:441). Weber and de Beaufort (1929:193) in giving the description of C. xiphoideus (not Günther) observed:

We made the above description after the specimen of the Siboga Expedition from the Timor sea, mentioned by one of us l.c., who stated already that there are some differences between Günther’s type specimen and this one. In the type the eyes are separated by more than one eye diameter and the upper one is considerably in advance of the lower: also the height is less, 4.2/3 times in length with caudal and the head is shorter, 5½ times in length with caudal. Therefore we are not sure that our specimen really is the same as C. xiphoideus and thought it therefore better to give a description of this specimen only.

I have examined the holotype of C. beauforti and compared it with the holotype and 13 other specimens of C. suyeni in the National Museum of Natural History, Smithsonian Institution, Washington, D.C. I have no hesitation regarding the inclusion of it in the synonymy of C. suyeni.

TYPE SPECIMENS.—Holotype of C. suyeni, USNM 93086, 142 mm SL, from Mindanao Island, Philippines, coll. Albatross. Holotype of C. beauforti, ZMA 108.001, 210 mm SL from Timor Sea, lat. 10°27′09″S, long. 123°28′7″E, coll. M. Weber, Siboga Expd.

OTHER MATERIAL EXAMINED.—13 specimens, USNM 137941–50, from Philippines to Celebes, coll. Albatross.

The heterolepis group

Two related species complexes of cynoglossus can be assembled in what may be called the heterolepis group, heterolepis being closest to the evolutionary stem of the group. They are characterized by a much elongated, pointed snout (except C. semilaevis and C. monophthalmus) with the angle of mouth situated nearer to branchial opening than to tip of snout, much smaller body scales, the interlinear scale count being 15–25, very small eyes with the interorbital space measuring about equal to the diameter of the eye or even wider than one eye diameter (C. heterolepis, C. gracilis, C. semilaevis, C. microlepis), and usually two nostrils on ocular side and three lateral lines. No lateral line on blind side.

The heterolepis group has its center of distribution in the Malay Archipelago and extends through the South China Sea and Taiwan to Korea and Japan; it is regarded as a very lately evolved group of specialized species split off from the carpenteri complex.

The heterolepis complex

Cynoglossus heterolepis, C. feldmanni, C. wandersi, C. kapuasensis, C. semilaevis, C. abbreviatus, C. gracilis, and C. microlepis form the heterolepis complex. The characteristics of this complex are almost the same as given for the group and it differs from the monophthalmus complex by having both nostrils present.

41. Cynoglossus heterolepis Weber

FIGURE 43; PLATE 19

Cynoglossus heterolepis Weber, 1910:237 [type-locality: Lorentz R.]; 1913a:590 [Lorentz R., Bivak Is.].—Weber and de Beaufort, 1929:186, figs. 52, 53 (Lorentz R.).—Hardenberg, 1941:227 (Petpemboewe).—Munro, 1958:285.

FIGURE 43.—C. heterolepis: a, outline drawing of holotype (BMNH 1913.12.15.36) from Lorentz River, New Guinea; b, details of the anal side of the holotype (female).

DESCRIPTION.—Based on 4 specimens, 65–194 mm SL, including the holotype of C. heterolepis.

Depth of body 16.44–23.45 (M = 18.89), length of head 19.07–25.09 (M = 23.28) percent of standard length. Diameter of eye 3.23–5.97 (M = 5.08), interorbital space 3.23–5.71 (M = 4.37) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in the middle of interorbital space. Snout obtusely pointed, 41.94–45.71 (M = 43.92) percent of length of head; rostral hook rather short, ends just in front of anterior nostril. Maxillary extending to a little behind fixed eye; angle of mouth extending below vertical from posterior border of fixed eye, nearer to branchial opening than to tip of snout; tip of snout to angle of mouth 43.24–57.14 (M = 51.06), angle of mouth to branchial opening 41.79–43.24 (M = 42.46) percent of length of head.

Scales: Ctenoid on both sides, those on blind side rather weakly serrated.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 100–120 scales, 15–16 scales between middle and upper lateral line. No lateral line on blind side.

Interlinear scale rows

15

16

Frequencies

2

2

Fins: Dorsal with 113–116 (M = 115) rays, anal with 86–89 (M = 88) rays, caudal 10 in 4 specimens (radiographs).

Vertebrae: 51–52, comprising 9 abdominal and 41–43 caudal elements in 4 specimens (radiographs).

Coloration: Upper side uniformly brownish with or without darker spots, lower whitish in preserved specimens.

Size: The largest specimen examined, 203 (194 + 9) mm, is the holotype from the Lorentz River, New Guinea.

DISTRIBUTION.—New Guinea (Lorentz River) and Australia (Northern Territory).

DIAGNOSIS AND AFFINITIES.—Though geographically widely separated, C. heterolepis is closely related to C. feldmanni, found in the rivers of Borneo, Sumatra, and Cambodia. It differs from C. feldmanni chiefly in its slender body (mean depth 18.89 percent of SL, cf. 27.11 percent) and relatively large scales, the interlinear scale rows being 15–16 versus 17–18 in C. feldmanni.

TYPE SPECIMENS.—Holotype of C. heterolepis, BMNH 1913.12.15.36, 194 mm SL, Lorentz River, New Guinea, coll. M. Weber.

OTHER MATERIAL EXAMINED.—1 specimen, BMNH 1937.3. 17.1, Upper Fly R., Papua, ex. American Museum. 4, USNM 174028. Australia, N.T., coll. R. R. Miller. Arnhem Land Expd.

42. Cynoglossus feldmanni (Bleeker)

FIGURE 44

Plagusia feldmanni Bleeker, 1853b:455 [type-locality: Borneo].

Arelia feldmanni.—Bleeker, 1859:184.

Cynoglossus feldmanni.—Bleeker, 1875:31, pl. 243: fig. 5, 184.

Cynoglossus (Areliscus) hardenbergi Norman, 1931.—422 [type-locality: Palembang, Sumatra].

Cynoglossus abentoni Stauch, 1966.—126 [type-locality: Baklau and Prek-Tasom, Cambodia].

DESCRIPTION.—Based on 2 specimens, 148.5 and 207.0 mm SL, including the holotype of C. hardenbergi.

Depth of body 26.94–27.29 (M = 27.11), length of head 21.55–22.46 (M = 22) percent of standard length. Diameter of eye 5.38–7.81 (M = 6.59), interorbital space 4.30–4.69 (M = 4.54) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in anterior half of interorbital space. Snout obtusely pointed, 39.78–40.62 percent of length of head, rostral hook of moderate size, reaches just below anterior border of fixed eye. Maxillary extending to below posterior half or posterior border of fixed eye; angle of mouth extending to below vertical from posterior half of fixed eye, slightly nearer branchial opening than tip of snout; tip of snout to angle of mouth 49.46–51.46 (M = 50.46), angle of mouth to branchial opening 46.88–49.46 (M = 48.17) percent of length of head.

Scales: Ctenoid on both sides except those on the head region of the blind side, where the scales are either cycloid or very feebly ctenoid.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 81–84 scales, 17–18 scales between middle and upper lateral lines. No lateral line on blind side.

Interlinear scale rows

17

18

Frequencies

1

1

Fins: Dorsal with 98 rays, anal with 77 rays, caudal 10 in 1 specimen (radiograph).

FIGURE 44. Outline drawing of C. feldmanni, holotype (BMNH 1862.6.3.10) from Borneo.

Vertebrae: 50, comprising 9 abdominal and 41 caudal elements in 1 specimen (radiograph).

Coloration: Upper side brownish with irregular darker spots, lower whitish in preserved specimens.

Size: Largest specimen examined, 231.5 (207 + 24.5) mm, is the type of C. hardenbergi from Sumatra.

DISTRIBUTION.—Borneo, Sumatra, and Cambodia. In rivers.

DIAGNOSIS AND AFFINITIES.—Cynoglossus feldmanni resembles both C. heterolepis and C. waandersi. The differences between this species and C. heterolepis have been previously outlined. It is distinguishable from C. waandersi by a lower interlinear scale count (17–18 cf. 24) and by the position of the rectus of the mouth, which is nearer to the branchial opening than to the tip of the snout (rectus of the mouth in C. waandersi is much nearer to the snout than to branchial opening).

NOTE ON SYNONYMY.—Bleeker (1853b:455) described P. feldmanni on the basis of a single specimen, 160 mm in TL from Pengaron, and characterized it as having three lateral lines on left side, the upper and lower separated from the middle by 17 or 18 series of scales, and by the angle of the mouth being nearer to gill opening than to extremity of snout. Norman (1931:422) described a similar species C. (Areliscus) hardenbergi on the basis of a single specimen, 233 mm in TL, from Palembaney, Sumatra and related it to C. feldmanni, but differentiated it by its larger scales and longer and more pointed rostral hook. He characterized the fish as having three lateral lines on ocular side, the upper and the middle separated by 16 or 17 series of scales. I have examined the holotype of C. (Areliscus) hardenbergi in the British Museum and found it to conform well with the description and figure of C. feldmanni, the differences noted by Norman being considered here as attributable to intraspecific variation in the species.

Stauch (1966:126) described C. abentoni on the basis of two specimens, 66 and 129 mm in TL, from Ba-Klaut and Prek-Tasom, Cambodia, and characterized it as having three lateral lines on ocular side, the upper and the middle being separated by 16 series of scales. Stauch, while describing the fish, compared it with C. waandersi (Bleeker). Cynoglossus waandersi, however, has smaller scales, the interorbital scale rows being 24, whereas in the interlinear scale character and other proportional and meristic characters C. abentoni is identical with C. feldmanni. I have examined the holotype and the paratype of C. abentoni in Paris and found them identical with C. feldmanni.

TYPE SPECIMENS.—Among the Bleeker collection in Leiden is a specimen, 145 mm SL, 162 mm TL, cataloged as RMNH 6782 from Pengaran, Borneo, coll. A. Feldmann, 1852 (pers. comm. Dr. M. Boeseman) that appears to be the holotype of C. feldmanni. Holotype of C. hardenbergi, BMNH 1931.4.23, 207 mm SL, Sumatra, coll. Hardenberg. Holotype of C. abentoni, MNH P 65–466, 120 mm SL, Ba Klaut, Patit Lac, coll. Aubenton, paratype, MNH P 65–465, 61 mm SL, Prek Tasom, coll. Aubenton.

OTHER MATERIAL EXAMINED.—SUMATRA: 1 specimen, ZMA 108.004. Ojambi. BORNEO: 1. BMNH 1862.6.S.10, Borneo, coll. Bleeker.

43. Cynoglossus waandersi (Bleeker)

PLATE 19

Plagusia waandersii Bleeker, 1854a:98 [type-locality: confluence of rivers Lamatang and Enim at Felembang, eastern Sumatra].

Arelia waandersii.—Bleeker, 1859:185.

Cynoglossus waandersi.—Bleeker, 1875:31, pl. 241: fig. 2.—Weber and de Beaufort, 1929:189.

DESCRIPTION.—Based on a single specimen, 73.0 mm SL.

Depth of body 27.40 percent of standard length, length of head 24.66 percent. Diameter of eye 11.11, interorbital space 5.56 percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, immediately in front of interorbital space. Snout obtusely pointed, 41.67 percent of length of head; rostral hook, rather short, ends in front of anterior border of fixed eye. Maxillary extending to below posterior half of fixed eye; angle of mouth extending below vertical from middle of fixed eye, nearer to tip of snout than branchial opening; tip of snout to angle of mouth 47.22, angle of mouth to branchial opening 55.56 percent of length of head.

Scales: Ctenoid on both sides.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 80 scales, 24 scales between middle and upper lateral lines. No lateral line on blind side.

Fins: Dorsal with 89 rays, anal with 67 rays, caudal 10 in 1 specimen (radiograph).

Vertebrae: 42, comprising 9 abdominal and 33 caudal elements (radiograph).

Coloration: Upper side yellowish brown, with darker patches, lower whitish in preserved specimens.

Size: The only specimen examined, 83 (73 + 10) mm, is from Sumatra (reported up to 300 mm by Weber and de Beaufort).

DISTRIBUTION.—Sumatra and Borneo, in rivers.

DIAGNOSIS AND AFFINITIES.—This species is more closely allied to C. kapuasensis than to C. feldmanni in having the more enlarged body and smaller scales. It can, however, be separated from C. kapuasensis by having the rictus of the mouth nearer to the tip of the snout than to the branchial opening and by its reduced eyes (diameter 11.11 percent in length of head cf. 7.41 percent).

From all the other members of the heterolepis group, however, C. waandersi is distinct in its fewer vertebrae (Figure 53, Graph 4).

TYPE SPECIMENS.—Bleeker’s (1854a:98) description of P. waandersi was based on a single specimen, 145 mm in TL, from the confluence of the Lamatang and Enim rivers at Pelembang, Sumatra. In his Atlas (1875–1876:31, pl. 241: fig. 2), he described and illustrated a specimen measuring 145 mm in TL. Among the Bleeker collection in Leiden is a specimen, 129 mm SL, 145 mm in TL from the confluence of Lamatang and Enim rivers, Prov. Palembang, Sumatra, coll. P. S. van Bloemen Waanders, 1854, cataloged as RMNH 6781 (pers. comm. Dr. M. Boeseman). It is here considered to be the holotype of C. waandersi.

OTHER MATERIAL EXAMINED.—1 specimen, USNM 171680, Moesi R., Moeara, Sumatra, coll. A. Thieremann, 1929.

44. Cynoglossus kapuasensis Fowler

Cynoglossus kapuasensis Fowler, 1905:519 [type-locality: Kapuas R., W Borneo].

Cynoglossus kapwasensis.—Seale, 1910:288 [misprint for C. kapuasensis].

DESCRIPTION.—Based on a single specimen, the holotype, 285.0 mm SL.

Depth of body 23.16, length of head 18.95 percent of standard length. Eyes small, diameter of eye 7.41, interorbital space is equal to one eye diameter, 7.41 percent in length of head. Two nostrils on ocular side, anterior nostril tubular, just in front of vertical through front border of lower eye, posterior nostril simple, in posterior half of interorbital space. Snout rather obtusely pointed, 45.37 percent of head; rostral hook rather long, reaches below fixed eye. Maxillary extending to below posterior border of fixed eye; angle of mouth extending to below vertical from posterior half of fixed eye, nearer to branchial opening than to tip of snout; tip of snout to angle of mouth 61.11, angle of mouth branchial opening 50.0 percent of head.

Scales: Ctenoid on both sides, scales on anterior third of body smaller than those on rest of body.

Lateral-Line System: Three lateral lines on ocular side, dorsolateral line running backward and entering dorsal fin along 5th ray, counted from the rear, midlateral line with 126 scales, 25 scales between middle and upper lateral lines; ventrolateral line runs backward and enters anal fin along 5th ray, counted from the rear. No lateral line on blind side.

Fins: Dorsal with 109 rays, anal with 85 rays, caudal 10 in 1 specimen (radiograph).

Vertebrae: 50, comprising 9 abdominal and 41 caudal elements, in 1 specimen (radiograph).

Coloration: Upper side rather dark brown with darker mottlings and blotches, lower rather brownish white in preserved specimens.

Size: The only specimen examined is 285.0 mm in SL.

DISTRIBUTION.—Western Borneo (Kapuas River).

DIAGNOSIS AND AFFINITIES.—This species is closely related to C. feldmanni and C. waandersi. It is distinguished from C. feldmanni by larger eyes (diameter 7.41 percent of head cf. 6.59 percent), wider interorbital space (7.41 percent of head cf. 4.54 percent), and smaller scales, the interlinear scale rows being much larger (25 cf. 17–18). From C. waandersi it is separated by having the rictus of the mouth situated nearer to the branchial opening than to the tip of snout, by smaller eyes (diameter of eye 7.41 percent of head cf. 11.11 percent), and wider interorbital space (7.41 percent of head cf. 5.56 percent of head).

TYPE SPECIMEN.—Holotype of C. kapuasensis, ANSP 72348, 285 mm SL, Kapuas R., W Borneo, coll. Harrison and Hiller, 1898.

45. Cynoglossus semilaevis Günther

FIGURE 45: PLATE 20

Cynoglossus semilaevis Günther, 1873:379 [type-locality: Chefoo, China]; 1898:261 [Nin-Tchouang].—Mori, 1927:183.—Chu, 1931:95.—Wu, 1932:152 [Tsing-Wang-Tao, Tsing-Tao, Tchefoo, Tcha-Pou, Wen Chou, and Amoy].

Areliscus semilaevis.—Jordan and Starks, 1906a:242.

Trulla semilaevis.—Fowler, 1934b:212.

Arelia rhomaleus Jordan and Starks, 1906b:526, fig. 5 [Port Arthur, Manchuria],

Areliscus rhomaleus.—Jordan and Metz, 1913:63.—Reeves, 1927:14 [Swatow].—Sowerby, 1930:183.—Chu, 1931:95.

Cynoglossus roulei Wu, 1932:153 [type-locality: Amoy, China].

DESCRIPTION.—Based on 8 specimens, 134.0–530.0 mm SL, including the holotype of C. semilacvis and syntypes of C. roulei.

Depth of body 24.63–30.19 (M = 27.09), length of head 20.89–26.79 (M = 23.93) percent of standard length. Upper eye not in advance of fixed eye, diameter of eye 3.52–8.11 (M = 5.77), interorbital space rather broad, 5.88–9.28 (M = 8.09) percent of the length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower edge of lower eye, posterior nostril simple, in the anterior half of interorbital space. Snout rather rounded, 34.26–37.10 (M = 36.02) percent of head, rostral hook short, extending to front of anterior nostril. Maxillary extending to behind fixed eye; angle of mouth extending below vertical from posterior half of fixed eye, nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 44.33–50.0 (M = 46.69), angle of mouth to branchial opening 50.0–56.45 (M = 54.35) percent of length of head.

Scales: Ctenoid on ocular side, cycloid on blind side.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 110–138 (M = 120) scales, 20–25 (M = 23) scales between middle and upper lateral lines. No lateral line on blind side.

FIGURE 45.—C. semilaevis: a, outline drawing of specimen (BMNH 1898.2.28.9) from Liao-hu, north China; b, details of anal region of blind side of holotype, male (BMNH 1873.923.16) from Chefoo.

Interlinear scale rows

20

21

23

24

25

Frequencies

1

1

3

2

1

Fins: Dorsal with 124 rays, anal with 96 rays, caudal 10 in 1 specimen (radiograph).

Vertebrae: 55, comprising 11 abdominal and 44 caudal elements in 1 specimen (radiograph).

Coloration: Upper side uniformly brown, lower whitish in preserved specimens.

Size: Largest specimen examined, 566 (530 + 36) mm, is from Shanghai.

DISTRIBUTION.—China.

DIAGNOSIS AND AFFINITIES.—This species is closely related to C. abbreviates but is readily separated from it by the number of caudal fin rays (10), short rounded snout (mean length 36.0 percent of head cf. 37.52 percent), smaller eyes (mean diameter 5.77 percent of head cf. 7.57 percent), wider interorbital space (8.09 percent of head cf. 6.80 percent), and cycloid scales on the blind side of the body.

In the rounded short snout, 10 rays in the caudal fin, and the position of the rictus of the mouth, which is nearer to the snout than to the gill opening, C. semilaevis is considered a more generalized species and could represent the ancestral condition from which the more specialized species like C. abbreviatus, C. gracilis, and C. microlepis evolved.

NOTE ON SYNONYMY.—Günther (1873b:379) described C. semilaevis on the basis of a single specimen, 455 mm in TL, from Chefow, China and characterized it as having a deeper body, three lateral lines on the ocular side, the middle and the upper separated by 21 rows of scales, the scales between lateral lines smooth, between outer and vertical fins ctenoid, and cycloid on the blind side.

Arelia rhomaleus was described by Jordan and Starks (1906b: 526) on the basis of one specimen from Port Arthur, 380 mm in TL, and characterized by having three lateral lines, the middle and the upper being separated by 24 scale rows, ctenoid scales on ocular side and cycloid on the blind side. Jordan and Starks considered this species to be closely related to C. abbreviatus but preferred to retain it separately because of its increased number of interlinear scale rows. From trigrammus (= abbreviatus) they differentiated this species by its longer dorsal fin, larger eyes, and narrower interoribtal space. Fowler (1934b:213), however, confused this species with C. abbreviatus. Another species C. roulei with almost identical characters as C. rhomaleus was described by Wu (1932:153) from China. I have examined a type specimen of all three species and found them to be so similar in all respects that there is no question but that they are synonymous.

TYPE SPECIMENS.—BMNH 1873.9.23.16, 440.5 mm SL, holotype of C. semilaevis, Chefoo, coll. Surinhoe. USNM 55635, 363 mm SL, holotype of A. rhomaleus, Port Arthur, coll. J. F. Abbott. 2 specimens, 223 and 260 mm SL, BMNH 1860.7.28.48 and BMNH 1924.12.15.64, types (? syntypes) of C. roulei, Amoy, China, coll. Stevens (1860.7.28.48) and Light (1924.12.15.64).

OTHER MATERIAL EXAMINED.—2 specimens, BMNH 18955.15–16. Shanghai, coll. Stylan. I, BMNH 1896228.9, Liao-ho, N China, coll. Dr. W. Morrison. 1, BMNH 1930.728.13, Chekiang, China, coll. J. Chen. 3, BMNH 1939.1.17.56, Hong Kong. 1, (skeleton) MCZ 11323, Hong Kong. 3, USNM 56395, Port Arthur, China, coll. J. F. Abbott. I, USNM 137988, Kowloon, China, coll. Albatross.

46. Cynoglossus abbreviatus (Gray)

FIGURE 46: PLATE 20

Plagusia abbreviata Gray, 1835, pl. 94: fig. 3 [type-locality: China].—Richardson, 1846:280 [coasts of China, Canton].

Cynoglossus abbreviatus Günther, 1862:494 [Amoy]; 1873a:244 [Shanghai].—Bleeker. 1873:136.—Peters, 1880:923 [Ningpo]. —Seale, 1914:78 [Hong Kong].—Fowler and Bean, 1920:321 [Soochow].—Evermann and Shaw, 1927:113 [Hangchow, Nanking, Ningpo].—Tchang, 1929:37, fig. 43 [Yangtze R.].—Fowler, 1930:615 [Hong Kong].—Wu, 1932:157 [Tchou-San, Tchefoo, Tsingtao].—Ochiai, 1963:95, pl. 21.—Chu, 1963:544, fig. 441.—Shen, 1967:208 [Kowloon].

Areliscus abbreviatus.—Jordan and Metz, 1913:62 [Fusan].—Reeves, 1927:14 [Shanghai, Ningpo, Swatow].—Wu, 1929:71, fig. 57 [Amoy].—Chu, 1931:96.—Herre and Myers, 1931:252 [Canton].—Matsubara. 1955:1286.

Trulla abbreviata.—Fowler, 1934b:213, fig. 29 [China, Hong Kong, Canton, Amoy, Soochow, Ningpo, Hongchow, Nanking, Shanghai, Yangtze R.].

Cynoglossus trigrammus Günther, 1862:494, [type-locality: Chinese seas].—Bleeker, 1865b:56 [Amoy]; 1873:131.—Martens, 1876:399 [Shanghai].—Sauvage, 1881:107 [Swatow].—Rutter, 1897:89 [compiled].—Wu. 1932:160 [Swatow].—Wu and Wang, 1933:303 [Amoy].—Ochiai, 1959:211; 1963:92, pl. 20.—Chu, 1963:542, fig. 409.—Shen, 1967:210 [Kowloon].

Areliscus trigrammus.—Reeves, 1927:14.—Oshima, 1927:202 [Taihoku].—Chu, 1931:95.—Herre, 1932:433 [Canton].—Matsubara, 1955:1286.

Trulla trigrammus.—Fowler, 1934b:214.

Areliscus purpureomaculatus Regan, 1905a:26 [type-locality: Inland Sea of Japan].—Jordan and Starks, 1906a:242.—Jordan, Tanaka, and Snyder, 1913:336.—Jordan and Hubbs, 1925:303.—Wu, 1932:156 [Tsing-Tao, Chefoo].—Kamohara. 1952:86 [Tosa].—Mori, 1952:184 [Pusan].

Cynoglossus xiphoideus [not Günther].—Wu, 1932:158.

Areliscus gracilis [not Günther].—Chen and Weng, 1965:99 [Tungkong].

DESCRIPTION.—Based on 19 specimens, 96.0–285.0 mm SL, including the types of C. trigrammus and the holotype of C. purpureomaculatus.

Depth of body 22.58–27.78 (M = 24.98), length of head 18.16–22.22 (M = 20.22) percent of standard length. Diameter of eye 5.56–9.52 (M = 7.57), interorbital space 4.35–9.47 (M = 6.80) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in anterior half of interorbital space. Snout obtusely pointed, 35.24–40.71 (M = 37.52) percent of length of head, rostral hook short, ends in front of anterior nostril. Maxillary extending to below posterior half or rarely to posterior border of fixed eye; angle of mouth extending below vertical from middle or posterior half of fixed eye, slightly nearer to tip of snout than to branchial opening; tip of snout to angle of mouth 46.23–50.0 (M = 47.89), angle of mouth to branchial opening 47.62–55.79 (M = 52.44) percent of head.

Scales: Rather small, ctenoid on both sides, those on blind side weakly serrated.

Lateral-Line System: Three lateral lines on ocular side, dorsolateral line running backward and entering dorsal fin posteriorly, midlateral line with 118–136 (M = 125) scales, 18–23 (M = 21) scales between middle and upper lateral line, ventrolateral line runs backward and enters anal fin posteriorly. No lateral line on blind side.

Interlinear scale rows

18

19

20

21

22

23

Frequencies

3

1

4

6

4

1

Fins: Dorsal with 128–135 (M = 130) rays, anal with 100–108 (M = 104) rays, caudal 8 (9) in 12 specimens (radiographs).

Vertebrae: 60–64, comprising 10–11 abdominal and 46–53 caudal elements in 12 specimens (radiographs).

Coloration: Upper side brownish with or without dark blotches, lower whitish in preserved specimens.

Size: Largest specimen examined, 295.0 mm SL, is from Hong Kong.

DISTRIBUTION.—South China Sea (Amoy, Canton, Kowloon, Hong Kong, and Shanton) through Taiwan, Shanghai, Tunghai, and Po-hai to Korea and Japan.

DIAGNOSIS AND AFFINITIES.—Cynoglossus abbreviatus is closely related to C. gracilis; it is distinguished by its deeper body (mean depth of body 24.98 percent of SL, cf. 20.78 percent) and larger eyes (mean diameter 7.57 percent of head cf. 40.25 percent).

NOTE ON SYNONYMY.—Gray’s naming of P. abbreviatus was based on Hardwicke’s collection of illustrations. The illustration that is the iconotype of the species was issued in 1834 as part of one group among several that were later combined in two volumes without text (Gray, 1834). Günther (1862:496) gave the description of the species and characterized it as having three lateral lines, the middle and the upper separated by 19 series of scales, the height of the body being contained three and three-fourths in the total length, and the length of head four times and two-thirds. This description agrees well with Gray’s illustration of the species. Günther mentioned the type of the species “adult: stuffed. China. Presented by J. R. Reeves Esq.” 1 have examined two stuffed specimens, 220 and 315 mm SL, of C. abbreviatus from Reeves’ collections, which in most probability formed the basis for Hardwicke’s illustration of the species.

FIGURE 46.—Outline drawing of C. abbreviatus (BMNH 1924.12.15.62) from Amoy.

Cynoglossus trigrammus, described on the basis of two specimens, 182.5 and 275 mm SL, from China is a synonym of P. abbreviatus. The differences noted, such as 21 series of scales separating the middle and upper lateral line, the height of the body four times and two-thirds and the length of the head five times and one-third are all attributable to intraspecific variation. Most subsequent workers, however, treated C. trigrammus as a species distinct from C. abbreviatus (Fowler, 1934b:214), their differentiation of the two species being mainly based on the depth of the body in TL. They considered forms with depth of three and three-fourths to four as C. abbreviatus, and those above four to four and one-half as C. trigrammus. Fowler further considered T. abbreviata as a species with ctenoid scales on the ocular side and cycloid on the blind (Fowler, 1934b:214) and T. trigrammus with ctenoid on both sides. I have examined the types of C trigrammus and compared them with a number of specimens labeled as C. abbreviatus from China in the British Museum and found them to be similar in proportional and meristic characters. The nature of the body scales as has been pointed out earlier cannot be depended upon for species differentiation, as the ctenoid scales tend to become weaker in their ctenoid nature as the fish grows. In bigger specimens the scales on the blind side appear more or less cycloid, especially on the anterior half of the body. Obviously, Fowler’s (1934b) inclusion of Arelia rhomaleus in the synonymy of C. abbreviatus was based on the cycloid nature of scales of the blind side of the fish, and A. rhomaleus is here placed under C. semilaevis. Ochiai (1963) synonymized C. purpureomaculatus Regan with trigrammus. Cynoglossus purpureomaculatus was described from Japan on the basis of a single specimen, 202 mm SL, which I have examined and found to agree well with C. abbreviatus. Regan did not compare his species with any other but indicated an interlinear scale row of 19, which falls within the range of variation of this character in C. abbreviatus.

TYPE SPECIMENS.—Of the two specimens from China on which Günther based his description of C. trigrammus, a specimen, BMNH 1856.9.19.1215, 182.5 mm SL, from the Hassler collection is selected here as the lectotype of C. trigrammus and the other specimen, BMNH 1851.12.27.169, 155 mm SL, as the paralectotype. BMNH 1905.6.6.248, 202 mm SL, holotype of C. purpureomaculatus, Japan, coll. Gordon Smith.

OTHER MATERIAL EXAMINED.—1 specimen, BMNH 1863.2.23.28, Amoy, China, coll. R. Surinhoe. 1, BMNH 1873.7.30, 60, Shanghai, coll. R. Surinhoe. 4, BMNH 1924.12.15.58–61, Foochow, China. 1, BMNH 1924.12.15.62, Amoy, coll. Light. 1, BMNH 1924.12.15.63. Amoy, China, coll. Light. 2, BMNH 1924.12.15.65, Foochow, China, coll. Light. 2, BMNH 1930.7.28.10.11, Paihow, Canton, coll. J. Chen. 1, BMNH 1931.6.23.7, Pearl R., Canton, coll. Hoffman. 2, BMNH 1939.1.17.57–58, Hong Kong, coll. Herklot. 1, BMNH 1939.1.12.59. Hong Kong, coll. Harklots. 1, BMNH 1939.3.23, 100, Hong Kong, coll. Harklots. 2, stuffed, China, coll. Reeves. 2, USNM 37762, Korea, coll. J. B. Bernadou. 1, USNM 84006, China, coll. N. Gist Gee. I. USNM 86028, China, coll. Sowerby. 2, USNM 87050, China, coll. Sowerby. USNM 87051, China, coll. Sowerby. 3, USNM 130447, China, coll. Sowerby. USNM 130482, China, coll. Sowerby. 1, USNM (without reg. no.), Pearl River mouth, Hong Kong, coll. Hong Kong Fisheries Dept. 1, ANSP 52908, Hong Kong coll. F. H. Fowler. 2, MCZ 11155–11156, China. 1, UMMZ 167447, China, coll. J. J. Tu.

47. Cynoglossus gracilis Günther

FIGURE 47; PLATE 21

Cynoglossus gracilis Günther, 1873a:244 [type-locality: Shanghai]; 1898:261 [New Chwang].—Mori, 1927:184.—Wu, 1932:160 [Yangtze R.].—Fowler, 1934b:214.—Tchang, 1955:304, fig. 189.—Chu, 1963:543, fig. 410.—Shen, 1967:209 [Kowloon].

Areliscus gracilis.—Reeves, 1927:14 [Chefoo].—Chu, 1931:96.—Matsubara, 1955:1286.

Trulla gracilis.—Fowler, 1934b:214.

Cynoglossus microps Steindachner, 1898:510 [type-locality: Hong Kong].—Wu, 1932:158.

Areliscus hollandi Jordan and Metz, 1913:62, pl. 9: fig. 3 [type-locality: Fusan, Korea].

Cynoglossus pellegrini Wu, 1932:159 [type-locality: Hainan].

Areliscus trigrammus [not Günther].—Chen and Weng, 1965:98, fig. 68 [Quemoy].

DESCRIPTION.—Based on 14 specimens (84–228 mm SL), including holotype and paratypes of C. gracilis.

Depth of body 19.08–23.20 (M = 20.78), length of head 16.92–23.18 (M = 20.42) percent of standard length. Upper eye not in advance of lower, diameter of eye 4.21–7.84 (M = 5.86), interorbital space 5.00–8.16 (M = 6.27) percent of length of head. Two nostrils on ocular side, anterior nostril tubular, in front of lower eye, posterior nostril simple, in anterior half of interorbital space, or at the middle of it. Snout obtusely pointed, 35.29–46.58 (M = 40.25) percent of length of head, rostral hook of moderate size, usually extending up to anterior nostril but sometimes reaching below anterior border of fixed eye. Maxillary extending to behind fixed eye; angle of mouth extending to below vertical from posterior border of fixed eye, nearer to branchial opening than to tip of snout; tip of snout to angle of mouth 47.73–57.53 (M = 52.14), angle of mouth to branchial opening 47.37–52.73 (M = 48.96) percent of length of head.

FIGURE 47.—Outline drawing of C. gracilis, holotype (BMNH 1873.7.30.57), from Shanghai.

Scales: Large or moderate, ctenoid on both sides, those on blind side, particularly in large specimens, very weakly serrated with a much reduced number of ctenii.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 122–138 (M = 135) scales, 19–22 (M = 21) scales between middle and upper lateral lines. No lateral line on blind side.

Interlinear scale rows

19

20

21

22

Frequencies

2

2

9

2

Fins: Dorsal with 133–137 (M = 135) rays, anal with 104–108 (M = 106) rays, caudal 8 in 10 specimens (radiographs).

Vertebrae: 62–64, comprising 11 or 12 abdominal and 51–55 caudal elements in 10 specimens (radiographs).

Coloration: Upper side uniformly light brown, lower whitish in preserved specimens.

Size: Largest specimen examined, 278.0 mm, is from Liao-hu, N China.

DISTRIBUTION.—From South China Sea through Taiwan, Tung-hai, and Chefoo to Pusan in Korea.

DIAGNOSIS AND AFFINITIES.—Cynoglossus gracilis is closely related to C. abbreviatus. It is distinguished from C. abbreviatus by its elongate body (mean depth 20.78 percent of cf. 24.98 percent), smaller eyes (5.86 percent of head cf. 7.57 percent), and longer snout (mean length 40.25 percent of head cf. 37.52 percent).

NOTE ON SYNONYMY.—Günther (1873a:244) described C. gracilis on the basis of one specimen, 225 mm in TL, and several young ones from Shanghai and characterized it as a species having three lateral lines, the upper and the middle being separated by 21 scales, extremely small eyes, and elongated body, the depth of body being five times in total length. The descriptions of C. microps and C. pellegrini do not indicate any significant difference from C. gracilis, and in both these species the height of the body is contained more than four times in the TL. Jordan and Metz (1913:62) described A. hollandi from Fusan, Korea on the basis of a single specimen and from the description and illustration of the fish, its identity with C. gracilis is unmistakable.

TYPE SPECIMENS.—BMNH 1873.7.30.57, 206 mm SL, holotype of C. gracilis, Shanghai, coll. Swinhoe. 2, BMNH 1873.7.30.58a, 59b, 87, and 79.5 mm SL, paratypes of C. gracilis, obtained along with the holotype. NHV 43.798, 227 mm SL, 241 mm TL, from Yangtse-Kiang, selected as lectotype of C. microps, NHV 43.799, 190 mm SL, 203 mm TL, collected along with lectotypes is a paralectotype of C. microps.

OTHER MATERIAL EXAMINED.—2 specimens, BMNH I873.9.23.20–21, Chefoo, toll. Swinhoe. 1, BMNH 1898.2.28.10, Liao-hu, N China, coll. Dr. W. Morrison. 4, BMNH 1924.12.1554–57, Foochow, China, coll. Light. 1, BMNH 1930.7.28–12, Chekiang, China, coll. J. Chen. 1, USNM 86466, China, coll. Sowerby. 3, USNM 130547, China, coll. Sowerby. 3, USNM 130521, Shanghai, China. 3, USNM 131071, China, coll. Dale and Jony, 1881. 1, USNM 148414, Shanghai, coll. D. C. Janson. 1, USNM 11329, Hong Kong. 1, NHV 43820, Shanghai. 1. NHV 43822, Canton. 1, ANSP 52907, Hong Kong, coll. H. W. Fowler.

48. Cynoglossus microlepis (Bleeker)

FIGURE 48; PLATE 21

Plagusia microlepis Bleeker, 1951a:413 [type-locality: Borneo]; 1852:31.

Arelia microlepis.—Bleeker, 1859:184.

Cynoglossus microlepis.—Günther, 1862:495.—Bleeker, 1875:32, pl. 243: fig. 3.—Vaillant, 1893:101.—Weber and de Beaufort, 1929:190.—Smith, 1933:83; 1945:442.—Suvatti, 1950: 327.—Punpoka, 1964:65.

Cynoglossus xiphoideus Günther, 1862:495 [type-locality: Siam].—Bleeker, 1865a:33.—Kner, 1867:294.—Hora, 1923a: 182.—Smith, 1933:83; 1945:441.—Suvatti, 1950:329.—Chabanaud, 1951c:l.

Cynoglossus (Arelia) solum Sauvage, 1878:92 [type-locality: Mekong River].

Arelia solum Sauvage, 1883:151.

Cynoglossus feldmanni [not Bleeker].—Weber and de Beaufort [in part], 1929:192.

Cynoglossus trigrammus [not Günther].—Suvatti, 1950:329.—Punpoka, 1964:75 [Gulf of Thailand].

DESCRIPTION.—Based on 4 specimens, 142.0–231.0 mm SL.

Depth of body 20.07–22.51 (M = 20.84), length of head 19.05–20.35 (M = 20.21) percent of standard length. Migratory eye is much in advance of fixed eye, diameter of eye 5.00–6.67 (M = 5.50), interorbital space rather broad 6.67–8.51 (M = 7.54) percent in length of head. Two nostrils on ocular side, anterior nostril tubular, in front of fixed eye, posterior nostril simple, in posterior half of interorbital space. Snout obtusely pointed, 40.0–45.0 (M = 42.82) percent of length of head, rostral hook rather long, reaches below middle or posterior half of fixed eye. Maxillary extending to below posterior border of fixed eye or a little behind; angle of mouth extending to below vertical from posterior half of fixed eye, nearer to branchial opening than to tip of snout; tip of snout to angle of mouth 54.26–55.0 (M = 54.82), angle of mouth to branchial opening 40.0–48.94 (M = 44.11) percent of length of head.

FIGURE 48.—C. microlepis (BMNH 1859.7.1.52) from Thailand: a, outline drawing of lateral view of ocular side; b, nature of scales along base of dorsal fin on ocular side; c, same on blind side.

Scales: Small, ctenoid on both sides, those on blind side weakly serrated.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 116–138 scales, 21–22 scales between middle and upper lateral lines. No lateral line on blind side.

Interlinear scale rows

21

22

Frequencies

5

2

Fins: Dorsal with 117–119 rays, anal with 92–96 rays, caudal 8 in 4 specimens (radiographs).

Vertebrae: 55–56, comprising 9 abdominal and 46–47 caudal elements in 4 specimens (radiographs).

Coloration: Upper side reddish brown with dark spots, lower whitish in preserved specimens.

Size: Largest specimen examined, 304 (270 + 34) mm, is from Sarawak, Borneo.

DISTRIBUTION.—Thailand, Cambodia, Vietnam, Borneo, and Sumatra. In strictly fresh water.

DIAGNOSIS AND AFFINITIES.—Cynoglossus microlepis is closely related to C. gracilis in most morphometric and meristic characters but can be readily distinguished by the position of its migratory eye, which is placed much in advance of the fixed eye. The much smaller eyes (mean diameter 5.50 percent of head cf. 7.57 percent), broader interorbital space (mean width 7.54 percent of head cf. 6.80 percent), and longer snout (mean length 42.82 percent of head cf. 37.52 percent) further distinguish the species from C. gracilis. Cynoglossus microlepis is considered more specialized toward a burrowing mode of life than C. abbreviatus or C. gracilis.

NOTE ON SYNONYMY.—Bleeker (1851a:413) described P. microlepis on the basis of a single specimen, 94 mm in TL, from rivers of Bandjermassing in Borneo, and characterized it as having three lateral lines on ocular side, one on blind side, much elongated body, the height of the body being five times in TL, smaller eyes, and 150 scale rows along the midlateral line. Unfortunately, neither Bleeker nor Günther (1862:495) gave the number of scale rows that separate the upper and the middle lateral lines in this species. This resulted in confusion as to the correct identity of the species, causing the creation of several new ones. Cynoglossus xiphoideus was described on the basis of two specimens, 150 and 229 mm in TL, from Thailand and characterized by three lateral lines on ocular side, the upper and middle being separated by 20 or 21 scale rows, one on the blind side, the interorbital space being more than that of the orbit and the upper eye considerably in advance of the lower. Many workers considered this species distinct from C. microlepis, though in the excellent illustration of C. microlepis in Bleeker’s Atlas (pl. 243: fig. 3), 21–22 interlinear scale rows and the position of the migratory eye in advance of the fixed eye are clearly indicated. Smith (1945:441) considered the two species distinct; the principal point of differences noted was a single distinct lateral line on the blind side in the case of C. microlepis and the larger number of scales in the medium lateral line as compared with C. xiphoideus. Comparison of a large number of specimens from Thailand does not substantiate Smith’s conclusions. The lateral line on the blind side is totally absent in all the specimens examined, though a somewhat lateral line-like streak is visible on the blind side, which, of course, is not pored. The type specimens of C. xiphoideus, in the British Museum, that were examined agree well with Bleeker’s description and illustration of P. microlepis, and since this species has priority over C. xiphoideus, I have used the name C. microlepis for the species.

Cynoglossus solum described by Sauvage (1878:92) from the Mekong River and characterized as having three lateral lines on the colored side, one on the blind side, and 166 scales in the midlateral line was synonymized by Smith (1945:442) and I concur with him.

TYPE SPECIMENS.—Of the two type specimens of C. xiphoideus in the British Museum, a specimen, BMNH 1859.7.1.52, 191 mm in SL, is selected here as the lectotype and the other specimen, BMNH 1859.7.1.53, 137.5 mm SL, as the paralectotype of C. xiphoideus.

Among the Bleeker collection in Leiden is a specimen, cataloged as RMNH 6784, 171 mm SL, 193 mm TL, from Bandjermassin, SE Borneo, coll. J. Wolff (pers. comm., Dr. M. Boeseman), and it is here considered as the holotype of C. microlepis. A. second specimen, RMNH 17876, 325 mm SL, 360 mm TL, is the figured specimen indicated as such by Chabanaud.

OTHER MATERIAL EXAMINED.—1 specimen, BMNH 1876.3.20.4, Laos, coll. Paris Museum. 5, BMNH 1898.4.2.130–134, Menam R., ex. Siamese Museum. 2, BMNH 1906.10.29.39–40, Sarawak, coll. S. L. Hora. 1, BMNH 1928.5.22.2, Bangkok, Thailand, coll. H. M. Smith. 1, ZMA 108.004, Indonesia, coll. Moolenburgh. 2, ANSP 89534, Gulf of Thailand, coll. R. M. de Schauensee. 1, USNM 103319, Menam Chau Phya, Thailand. 1, UMMZ 181238, Cambodia, coll. J. Bardoch. 1, ZSI , Montaburi, Thailand, coll. H. M. Smith.

The macrophthalmus complex

This species is like the members of the heterolepis complex except that only one (posterior) nostril is present on the ocular side. The center of distribution is in Queensland and probably descended from the same ancestral stock from which the heterolepis complex was derived.

49. Cynoglossus macrophthalmus Norman

PLATE 21

Cynoglossus macrophthalmus Norman, 1926:306, fig. 15 [type-locality: Southern Queensland, 20 miles off Bustard Head light].

DESCRIPTION.—Based on 2 specimens, 73.0–251.0 mm SL, including the holotype of C. macrophthalmus.

Depth of body 27.40–28.97 percent of standard length, length of head 23.84–24.66 percent. Diameter of eye 11.11–11.35, interorbital space 4.84–8.83 percent of length of head. Anterior nostril on ocular side tubular, in front of lower eye, posterior nostril absent. Snout rounded, 35.06–38.89 percent of length of head, rostral hook long, reaches below posterior border of fixed eye or just beyond. Maxillary extending to just behind fixed eye; angle of mouth extending to below vertical from posterior border of fixed eye, slightly nearer to branchial opening than to tip of snout; tip of snout to angle of mouth 50.08–55.56, angle of mouth to branchial opening 47.22–48.41 percent of length of head.

Scales: Small, weakly ctenoid on both sides.

Lateral-Line System: Three lateral lines on ocular side, midlateral line with 100–103 scales, 17–18 scales between middle and upper lateral lines. No lateral Une on blind side.

Fins: Dorsal with 110–111 rays, anal with 90–91 rays, caudal 10 in 2 specimens (radiographs).

Vertebrae: 53, comprising 9 abdominal and 44 caudal elements in 2 specimens (radiographs).

Coloration: Upper side brownish, lower whitish in preserved specimens.

Size: Largest specimen examined, 270 (251 + 19) mm, is the holotype from southern Queensland.

DISTRIBUTION.—Queensland; recorded from a depth of 20 fms.

DIAGNOSIS AND AFFINITIES.—Apparently related to the C. heterolepis complex but differing in the lack of a posterior nostril and possessing a rounded snout and a long rostral hook reaching to below posterior border of fixed eye. In its elongated body and reduced eyes it resembles C. waandersi.

TYPE SPECIMEN.—Holotype of C. macrophthalmus, AMS E 1978, 251 mm SL, 20 miles off Bustard Head light, southern Queensland.

OTHER MATERIAL EXAMINED.—1 specimen, AMS 1A 6460, from Lindeman Island, Queensland.

Literature Cited

*Not seen by author

Alcock, A.

1889. Natural History Notes from H. M. Indian Marine Survey Steamer “Investigator,” Commander Alfred Carpenter, Commanding, No. 10: List of the Pleuronectidae Obtained in the Bay of Bengal in 1888 and 1889 with Descriptions of New and Rare Species. Journal of the Asiatic Society of Bengal, 58(2):279–295, plates 16–18.

1890a. Natural History Notes from H. M. Indian Marine Survey Steamer, “Investigator,” Commander Hoskyn, Hoskyn, R. N., Commanding, No. 16: On the Bathybial Fishes Collected in the Bay of Bengal during the Season 1889–90. Annals and Magazine of Natural History, series 6, 6:197–222.

1890b. Natural History Notes from H. M. Indian Marine Survey Steamer, “Investigator,” Commander Hyskyn, R. N., Commanding, No. 20: On Some Undescribed Shore Fishes from the Bay of Bengal. Annals and Magazine of Natural History, series 6, 6:425–443.

1896. Natural History Notes from H. M. Indian Marine Survey Steamer, “Investigator,” Series II, No. 23: A Supplementary List of the Marine Fishes of India, with Descriptions of Two New Genera and Eight New Species. Journal of the Asiatic Society of Bengal, 65:301–333.

1898. Fishes. Part V in Illustrations of the Zoology of the Royal Indian Marine Survey Ship, “Investigator.” Plates XVIII–XXIV.

1899. A Descriptive Catalogue of the Indian Deep-Sea Fishes in the Indian Museum, being a Revised Account of the Deep-Sea Fishes Collected by the Royal Indian Marine Survey Ship “Investigator.” Pages 1–11+ 1–211 + index. Calcutta: Government Press.

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1925. A Monograph of the Marine Fishes of South Africa. Annals of the South African Museum, 21:1–1065.

1937. Further Notes on South African Marine Fishes. Annals of the South African Museum, 32(2):41–67.

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1953. Mediterranean Fishes of Israel. Bulletin of the Sea Fisheries Research Station (Haifa), 8:1–40, 20 figures.

1963. Systematics and Ecology of Indo-Pacific Fishes Recently Established in the Eastern Mediterranean. International Congress of Zoology, 16:115. [Abstract.]

1966. Red Sea Fishes Recently Found in the Mediterranean. Copeta, 1966(2):254–275.

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1849. Bijdrage tot de kennis der ichthyologische fauna van het eiland, Bali, met beschrijving van eenige nieuwe species. Verhandelingen van het Bataviaasch genootschap van Kunsten en Wetenschappen, 22:1–11.

1851a. Over eenige nieuwe soorten van Pleuronectoiden van den Indischen Archipel. Natuurkundig tijdschrift voor Nederlandsch-Indië, 1:401–416.

1851b. Bijdrage tot de kennis der ichthyologische fauna van Riouw. Natuurkundig tijdschrift voor Nederlandsch-Indië, 2:469–497.

1852. Bijdrage tot de kennis der Pleuronectoidei van den Soenda-Molukschen Archipel. Verhandelingen van het Bataviaasch genootschap van Kunsten en Wetenschappen, 24:1–32.

1853a. Nalezingen op de ichthyologische fauna van Bengalen en Hindostan. Verhandelingen van het Bataviaasch genootschap van kunsten en wetenschappen, 25:1–164, 6 plates.

1853b. Zevende bijdrage tot de kennis der ichthyologische fauna van Borneo: Zoetwatervischen van Sambas, Pontianak en Pengaron. Natuurkundig tijdschrift voor Nederlandsch-Indië, 5:427–462.

1853c. Nieuwe tientallen diagnostische beschrijvingen van nieuwe of Weinig bekende vischsoorten van Sumatra. Natuurkundig tijdschrift voor Nederlandsch-Indië, 5:495–534.

1854a. Overzicht der ichthyologische fauna Van Sumatra, met beschrijving van eenige nieuwe soorten. Natuurkundig tijdschrift voor Nederlandsch-Indië, 7:49–108.

1854b. Specierum piscium javanensium novarum vel minus cognitarum diagnoses adumbrate. Natuurkundig tijdschrift voor Nederlandsch-Indië, 7:415–448.

1858a. Twaalfde bijdrage tot de kennis der vischifauna van Borneo: Visschen Van Sinkawang. Acta Societatis Scientiarum Indo-Neerlandicae, 5:1–10.

1859a. Enumerado specierum piscium hucusque in Archipelago Indico observatarum, adjectis habitation ibus citationibusque ubi descriptiones earum recentiores reperiuntur, nec non speciebus Musei Bleekeriani Bengalensibus, Japonicis, Capensibus, Tasmanicisque. Acta Societatis Scientiarum Indo-Neerlandicae, 6:1–276, 36 plates.

1860a. Achtste bijdrage tot de kennis vischfauna van Sumatra. Visschen Van Benkoelen, Priaman, Tandjong, Palembang en Djambi. Acta Societatis Scientiarum Indo-Neerlandicae, 8:1–88.

1960b. Dertiende bijdrage tot de kennis der vischfauna van Borneo. Acta Societatis Scientiarum Indo-Neerlandicae, 8:1–64.

1865a. Nouvelle notice sur la faune ichthyologique de Siam. Nederlandsch Tijdschrift voor de Dierkunde, 2:33–37.

1865b. Notice sur les poissons envoye’s de Chine au Musée de Leide par M. G. Schlegel. Nederlandsch Tijdschrift voor de Dierkunde, 2:55–62.

1873. Mémoire Sur la fauna ichthyologique de Chine. Nederlandsch Tijdschrift voor de Dierkunde, 4:113–154.

1875. Atlas Ichthyologique des Indes Orientales Neerlandaises. Volume 6(1866–1872), pages 1–170, plates 232–278.

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1922. The Heterosomata (Flat Fishes) Collected by the S.S. “Pickle.” Report of Fisheries and Marine Biological Survey, Union of South Africa, 2(Special Report, 1):1–29, plates 1–6.

1925. A Collection of Heterosomata from Portugese East Africa. Transactions of the Royal Society of South Africa, 12:285–294.

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1971. Fishes of the Red Sea. Oceanography and Marine Biology, an Annual Review, 9:221–348.

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1901. Notes on the Classification of Teleostean Fishes, IV: On the Systematic Position of the Pleuronectidae. Annals and Magazine of Natural History, 7(8):261–271.

1902. Flat Fishes of the Cape Colony. Marine Investigations in South Africa, 1:1–10.

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1890. Reisebilder aus Liberia, 2 volumes.

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1960. Poissons de mer ouest-africaine observes du Senegal au Camoroun et plus specialement au large des cotes de Sierra Leone et du Ghana. Bulletin de l’Institut Française d’Afrique Noire, 22 A: 1358–1430, 6 plates.

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1850. Catalogue of Malayan Fishes. Journal of the Royal Asiatic Society of Bengal, 18[1849]:i–xii + 983–1442, 14 plates.

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1872. Journal de Sciencias mathematicas physicas et naturaes publicado sob as auspicias da Academia real das Sciencias de Lisboa.

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1861. Memoire sur les Poissons de I’ Afrique australe. Volume 7, i–vii + 1–78 pages.

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1931. Sur divers poissons soleiformes de la region Indo-Pacifique. Bulletin de la Société Zoologique de France, 56:291–305.

1933. Contribution a l’ osteologie comparative des poissons, principalement des teleosteens heterosomes. Bulletin de la Société Zoologique de France, 58:140–168, 1 plate, 21 figures.

1934a. Poissons recueillis dans le lac Timsah (isthme de Suez) per M. le Professeur A. Gruvel, en 1933. Bulletin du Museum National d’ Histoire Naturelle de Paris, (2)6:156–160.

1934b. Heterogenite des téléostéens dyssymetriques. Bulletin de la Société Zoologique de France, 59:275–284, 14 figures.

1936. Le neurocrane osseua des téléostéens dyssymétrique après la métamorphose. Annales de l’Institut Océanographique, 16:223–297, 112 figures.

1937. Les téléostéens dyssymétriques du Mokattam Inférieur de Tourah. Mémoires Institut d’ Egypte, 32:1–121, 4 plates, 19 figures.

1939. Catalogue systématique et chorologique des téléostéens dyssymétriques du Globe. Bulletin de l’Institut Oceanographique, 763:1–31 + list of addenda and corrigenda.

1940. Contribution à la morphologie des Cynoglossidae (Teleostei Pleuronectoidea Soleiformes). Bulletin du Museum National d’ Histoire Naturelle de Paris, (2)12:182–191,6 figures.

1947a. Notules ichthyologiques, XXXII: Description d’ un nouveau Cynoglossus de la Côte du Sénégal. Bulletin Museum National d’Histoire Naturelle de Paris, (2)19:440–443.

1947b. Notules ichthyologiques, XXXIII: Definition d’un genre inédit, appartment à la famille des Cynoglossidae. Bulletin du Muséum National d’ Histoire Naturelle de Paris, series 2, 19:443.

1947c. Description d’un nouveau Cynoglossus de l’ Inde. Annals and Magazine of Natural History, series 11, 14:813–815.

1949a. Revision des Cynoglossidae (S. Str.) de l’ Atlantique Oriental. Bulletin du Muséum National d’ Histoire Naturelle de Paris, series 2, 21:60–66.

1949b. Revision des Cynoglossidae (S. Str.) de l’ Atlantique Oriental (Suite). Bulletin du Muséum National d’ Histoire Naturelle de Paris, series 2, 21:202–209.

1949c. Revision des Cynoglossidae (S. Str.) de Atlantique Oriental (Suite & fin). Bulletin du Muséum National d’ Histoire Naturelle de Paris, series 2, 21:347–353.

1949d. Les Cynoglossus de l’ Atlantique. Bulletin du Muséum National d’ Histoire Naturelle de Paris, series 2,21:516–521.

1949e. Description d’un nouveau Cynoglossus de la Mer Rouge. Bulletin de la Société Zoologique de France, 74:145–148.

1950. Notules ichthyologique, XLII–XLVI. Bulletin du Muséum National d’ Histoire Naturelle de Paris, series 2, 22:336–340, I figure.

1951a. Definition et nomenclature des morphes pleurogrammiques des Cynoglossidae: Revision de quatre espèces du genre Cynoglossus. Bulletin du Muséum National d’ Histoire Naturelle de Paris, series 2, 22:713–716.

1951b. Definition et nomenclature des morphes pleurogrammique des cynoglossidae: Revision de quatre especes du genre Cynoglossus. Bulletin du Muséum National d’ Histoire Naturelle de Paris, series 2, 23:77–81.

1951c. Sur deux Cynoglossus de la collection ichthyologique der Zoologisch Museum, Amsterdam. Beaufortia, 5:1–4, 3 figures.

1951d. Sur divers Cynoglossus de la region Indo-Pacifique. Annals and Magazine of Natural History, series 12, 4:262–273.

1954. Notules ichthyologiques. Notule 47: Présence inédite d’un Cynoglossus dans la Mediterrane orientale. Bulletin du Muséum National d’ Histoire Naturelle de Paris, series 2, 26:465–466.

1955a. Rectifications afférentes á la nomenclature et á la systématique des pleuronectiformes du Sous—ordre des Soleoidei. Bulletin du Muséum National d’ Histoire Naturelle de Paris, series 2, 27:447–452.

1955b. Sur la répartition circumafricaine de diverses especes de la famille des Soleidae. Comptes Rendus Hebdomadaires des Séances et Mémoires de la Société de Biogeographie, 281:99–106.

1956. Sur divers pleuronectiformes apparement au naturhistorisches museum de vienne: Nouvelle description de Cynoglossus canariensis. Osterreichs Zoologische Zeitschrift, 5(1955):403–406.

1965. Notules ichthyologique 50: Modification avec l’age et l’ecaillure zenithala, phenomene paraissant particulier a certains teleosteens soleidei du genre Cynoglossus. Bulletin du Muséum d’Histoire Naturelle de Paris, series 2, 36:756–760.

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1926. Les poissons de Port-Etienne: Contribution a la faune ichthyologique de a region du Cap Blanc (Mauritanie Francaise). Bulletin du Comité d’Études Historiques et Scientifiques de l’Afrique Occidentale Française, 6:225–287, 2 plates, 33 figures.

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1951. Monograph of the Fishes of Taiwan (in Chinese). Quarterly Journal of the Taiwan Museum, 4:110–163.

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1965. A Review of the Flat Fishes of Taiwan. Biological Bulletin, (Tunghai University), 25–27(Ichthyology Series, 5):1–103, 72 figures.

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1931. Index Piscium Sinensium. Biological Bulletin of St. John’s University (Shanghai), 1:1–290.

1963. Fishes of Tung-hai. Pages 510–544.

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1836. Le règne animal. 3rd edition, volume 4, 391 pages, 120 plates.

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1934. Tertiary Faunas, a Text Book for Oilfield Palaeontologists and Students of Geology. Volume 2, i–x + 1–252 pages, 22 figures. London: Thomas Murby & Co.

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1867. On Some New or Imperfectly Known Fishes of Madras. Proceedings of the Zoological Society of London, pages 558–565.

1869. Remarks on Some of the Fishes in the Calcutta Museum. Proceedings of the Zoological Society of London, pages 511–527, 548–560, 611–614.

1873. On Some New Fishes of India. Journal of the Linnean Society, 11:524–529.

1877. Fishes of India. Part 3, pages 369–552, plates 79–133. London.

1889. Fishes. In Fauna of British India, including Ceylon and Burma. Volume 2, pages 1–XIV + 1–506, 177 figures. London: Taylor & Francis.

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1956. The Flat Fishes (Heterosomata) of Ceylon with a List of the Specimens in the Colombo Museum. Ceylon Journal of Science, Section C, Fisheries, 7 (2):183–200.

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1858. Reptiles et poissons de l’Afrique occidentale: Etude précédée de considérations générales sur leur distribution géographique. Archives du Muséum National d’Histoire Naturelle, 10:137–268.

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1904. Die Fische der malayischen Halbinsel. Mitteilungen aus dem Naturhistorischen Museum, 21:133–207.

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1953. Zoogeography of the Sea. 417 pages. London: Sidgurick & Jackson Ltd.

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1937. A Comparative Study of the Brains in Pleuronectidae. Proceedings of the Royal Society, series B, 122:308–43, 30 figures.

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1927. Fishes from Eastern China, with Descriptions of New Species. Proceedings of the California Academy of Sciences, 16:97–122.

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1904. A Collection of Fishes from Sumatra (with bibliography). Journal of the Academy of Natural Sciences of Philadelphia, 2(12):495–560, 21 plates.

1905. Some Fishes from Borneo. Proceedings of the Academy of Natural Sciences of Philadelphia, 57:455–523.

1918a. The Fishes of the United States Eclipse Expedition to West Africa. Proceedings of the United States National Museum, 56:195–292.

1918b. A List of Philippine Fishes. Copeia, 58:62–65.

1925. Fishes from Natal, Zululand, and Portuguese East Africa. Proceedings of the Academy of Natural Sciences of Philadelphia, 77:187–268, 4 figures.

1930. Notes on Japanese and Chinese Fishes. Proceedings of the Academy of Natural Sciences of Philadelphia, 81:589–616, 2 figures.

1934a. Descriptions of New Fishes Obtained in 1907 to 1910 Chiefly in the Philippine Islands and Adjacent Seas. Proceedings of the Academy of Natural Sciences of Philadelphia (1933), 85:233–367, 117 figures.

1934b. A Synopsis of the Fishes of China, Part V (continued): The Cods, Opahs, Flounders, Soles, John Dories, Berycoids, Pipe Fishes, Silversides, Mullets, Barracudas, and Thread Fishes. Hong Kong Naturalist, 5(3):210–225, 9 figures.

1935. South African Fishes Received from Mr. H. W. Bell-Marley in 1935. Proceedings of the Academy of Natural Sciences of Philadelphia, 87:361–408, 39 figures.

1936. The Marine Fishes of West Africa, Based on the Collection of the American Museum Congo Expedition, 1909–1915. Bulletin of the American Museum of Natural History, 70(1):1–1493,567 figures.

1938. A List of the Fishes Known from Malaya. 268 pages. Singapore: Government Printing Press.

1956. Fishes of the Red Sea and Southern Arabia, 240 pages, 115 figures. Jerusalem: Weizmann Science Press of Israel.

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1920. A Small Collection of Fishes from Soochow, China with Descriptions of Two New Species. Proceedings of the United States National Museum, 58:507–321.

1922. Fishes from Formosa and the Philippine Islands. Proceedings of the United States National Museum, 62:1–73, 4 figures.

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1926. Zoological Results of the Cambridge Expedition to the Suez Canal, 1924. Transactions of the Zoological Society of London, 22:1–64.

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1965. Otoliths of Some Early Coenozoic Fishes of the Gulf Coast. Journal of Paleontology, 39(4):687–718, 3 plates.

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1889. A Preliminary Report on the Fishes Collected by the Steamer “Albatros” on the Pacific Coast of North America during the year 1889, with Description of Twelve New Genera and Ninety-Two New Species. Proceedings of the United States National Museum, 13:49–126.

Gilchrist, J. D. F.

1905. Description of New South African Fishes. Marine Investigations in South Africa, 3:1–16.

1908. Descriptions of Fifteen New South African Fishes with Notes on Other Species. Marine Investigations in South Africa, 4:143–171.

Gilchrist, J. D. F., and W. W. Thompson

1917. A Catalogue of the Sea Fishes Recorded from Natal. Annals of Durban Museum, 1(4):291–431.

Ginsburg, J.

1951. Western Atlantic Tongue-Fishes with Descriptions of Six New Species. Zoologica, 36(3):185–201.

Goode, G. B., and T. H. Bean

1885. Descriptions of New Fishes Obtained by the United States Fish Commission, Mainly from Deep Water of the Atlantic and Gulf Coasts. Proceedings of the United States National Museum, 8:589–605.

1886. Report on the Results of Dredging, under the Supervision of Alexander Agassiz in the Gulf of Mexico (1877–78) and the Caribbean Sea (1878–79) and along the Atlantic Coast of the United States by the U.S. Coast Survey Steamer “Blake,” XXXVI: Oceanic Ichthyology. Bulletin of the Museum of Comparative Zoology at Harvard College, 12:1–XXXV +1–553, 123 plates (417 figures).

Gray, John Edward

1835. Illustrations of Indian Zoology, Chiefly Selected from the Collections of Major General Hardwicke. Volume 2, 102 plates. London: Adolphus Richter & Co.; Parbury, Allen & Co.

Gruvel, A., and P. Chabanaud

1937. Missions A. Gruvel dans le canal de Suez, II: Poissons. Memoires Institut d’ Egypte, 35:1–30, 29 figures.

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1861. Catalogue of the Fishes in the British Museum. Volume 3, 586 pages.

1862. Catalogue of the Fishes in the British Museum. Volume 4,504 pages.

1873a. Report on Collections of Fishes from China. Annals and Magazine of Natural History, series 4, 12:239–250.

1873b. On a Collection of Fishes from Chefoo, North China. Annals and Magazine of Natural History, series 4, 12:377–380.

1878. Notes on a Collection of Japanese Sea-Fishes. Annals and Magazine of Natural History, series 5, 1:485–487.

1880. Report on the Shore Fishes. Pages 1–82 in part 6 in volume 1 of Zoology in Reports…the Voyage of H.M.S. “Challenger”…32 plates.

1898. Report on a Collection of Fishes from Newchwang, North China. Annals and Magazine of Natural History, 7(1):257–263, plate XIII.

Hamilton-Buchanan, F.

1822. An Account of the Fishes Found in the River Ganges and Its Branches. 405 pages, 39 plates. Edinburgh: Archibald Constable.

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1941. Fishes of New Guinea. Treubia, 18:217–231, 4 figures.

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1932. Fishes from Kwangtung Province and Hainan Island, China. Lingnan Science Journal (Canton), 11:423–443, 1 figure.

1933. A Check List of Fishes from Sandakan, British North Borneo. Journal of the Pan-Pacific Research Institute, 8:2–5.

1934. Notes on Fishes in the Zoological Museum of Stanford University, 1: The Fishes of the Herre Philippine Expedition of 1931. Pages 1–106.

1941. A List of Fishes Known from the Andaman Islands. Memoirs of the Indian Museum, 13:331–403.

1953. Check List of Philippine Fishes. U.S. Fish and Wildlife Service, Research Report (United States Department of Interior), 20:1–977.

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1931. Fishes of the South-eastern China and Hainan. Lingnan Science Journal (Canton), 10:233–254.

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1952. A List of the Fishes Collected in the Province of Echigo, including Sado Island (in Japanese). Japanese Journal of Ichthyology, 2:220–229.

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1923a. On a Collection of Fish from Siam. Journal of the Natural History Society of Siam, 6:143–184, plates X–XII.

1923b. Fauna of the Chilka Lake. Memoirs of the Indian Museum, 5:739–769.

1929. An Aid to the Study of Hamilton-Buchanan’s “Gangetic Fishes.” Memoirs of the Indian Museum, 9:169–192, 10 plates.

Hubbs, C. L.

1915. Flounders and Soles from Japan, Collected by the United States Bureau of Fisheries Steamer, “Albatross” in 1966. Proceedings of the United States National Museum, 48:449–496, plates XXV–XXXII.

1945. Phylogenetic Position of the Citharidae, a Family of Fiat-Fishes. Miscellaneous Publications of the Museum of Zoology, University of Michigan, 93:1–38.

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1910a. Report on the Fishes Taken by the Bengal Fisheries Steamer “Golden Crown.” Memoirs of the Indian Museum, 3:1–31.

1910b. Notes on Fish from India and Persia, with Descriptions of New Species. Records of the Indian Museum, 5:123–140, 1 plate.

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1853. Ichthyological Gleanings in Madras. Madras Journal of Literature and Science, 17(39[1851]):128–151.

Johnstone, J.

1904. Report of the Marine Fishes Collected by Professor Herdman, at Ceylon in 1902. Report of the Government of Ceylon on the Pearl Oyster Fisheries of the Gulf of Mannar, part 2 (supplemental report), 15:201–222, 2 plates.

Jordan, D. S., and B. W. Evermann

1903. Notes on a Collection of Fishes from the Island of Formosa. Proceedings of the United States National Museum, 25:315–368, 29 figures.

Jordan, D. S., and C. L. Hubbs

1925. Record of Fishes Obtained by David Starr Jordan in Japan, 1922. Memoirs of the Carnegie Museum, 10(2):93–346, plates V–XII.

Jordan, D. S., and C. W. Metz

1913. A Catalogue of the Fishes Known from the Waters of Korea. Memoirs of the Carnegie Museum, 6:1–65. 10 plates.

Jordan, D. S., and R. E. Richardson

1908. Fishes from Islands of the Philippine Archipelago. Bulletin of the United States Bureau of Fisheries, 27:233–287.

1909. A Catalogue of the Fishes of the Island of Formosa or Taiwan, Based on the Collections of Dr. Hans Sauter. Memoirs of the Carnegie Museum, 4:159–204.

Jordan, D. S., and A. V. Seale

1907. Fishes of the Islands of Luzon and Panny. Bulletin of the Bureau of Fisheries, 26:1–48.

Jordan, D. S., and J. O. Snyder

1900. A List of Fishes Collected in Japan by Keinosuke Otaki, and by the United States Steamer “Albatross” with Descriptions of Fourteen New Species. Proceedings of the United States National Museum, 23:335–380, plates 19, 20.

1901. A Preliminary Check List of the Fishes of Japan. Annotationes Zoologicae japonenses, 3:31–159.

Jordan, D. S., and E. C. Starks

1906a. A Review of the Flounders and Soles of Japan. Proceedings of the United States National Museum, 31:161–246.

1906b. Notes on a Collection of Fishes from Port Arthur, Manchuria, Obtained by James Francis Albott. Proceedings of the United States National Museum, 31:515–526.

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1913. A Catalogue of the Fishes of Japan. Journal of the College of Science, Imperial University of Tokyo, 33(1):300–400.

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1914. Record of the Fishes Obtained in Japan in 1911. Memoirs of the Carnegie Museum, 6:205–213.

Kamohara, T.

1934. Supplementary Notes on the Fishes Collected in the Vicinity of Kochi Shi. Zoological Magazine (Tokyo), 46:457–463.

1938. On the Offshore Bottom-Fishes of Province Tosa, Shikoku, Japan. 86 pages.

1952. Revised Descriptions of the Offshore Bottom-Fishes of Province Tosa, Shikoku, Japan. Research Report of the Kochi University, 3:1–122, 100 figures.

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1858. Uebersicht der Plagusinae der funften subfamilie der Pleuronectidae. Archiv fur Naturgeschichte, 24(1):105–110.

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1871. Synopsis der Fische des Rothen Meeres, II: Theil. Verhandlunger der Zoologischbotanischen Gesselschaft in Wien, 21:441–668.

1880. Die Von Mullersche Sammlung australischer Fische in Stuttgart. Sitzungsberichte der Akademie der Wissenschaften in Wien, 80(1):325–430.

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1867. Fische. Pages 275–433 in part 5 of Zoologischer Theil of Reise der Ostereichischen Fregatte Novara um die Erde in den Jahren 1857, 1858, 1859. 5 plates. Wien.

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1955. Zoogeography of the Near East. Systematic Zoology, 4(2):49–96.

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1931. List of the Fishes Found in the Waters Near Shizuura, Province Suruga. Amoeba, 3:85–127.

1951. A Nominal List with Distribution of the Fish of Suruga Bay, inclusive of the Fresh-Water Species Found Near the Coast. Japanese Journal of Ichthyology, 1:314–338, 376–394.

1954. Additions to the List of Fishes of Suruga Bay. Japanese Journal of Ichthyology, 3:64–67, 3 figures.

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1939. The Miscellaneous Notes on the Flat Fishes Preserved at the Kominato Marine Biological Station, Chiba Prefecture. Suisan-Kenkyusi, 34:83–86.

1961. A Check List of Fishes of Vietnam. 66 pages. Division of Agriculture and Natural Resources: United States Operations Mission to Vietnam.

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1913. Flatfishes (Heterosomata). Volume 2 in Report on the Danish Oceanographical Expeditions, 1908–1910, to the Mediterranean. 150 pages, 4 plates.

1921. The Asymetry, Metamorphosis, and Origin of Flat Fishes. Philosophical Transactions of the Royal Society, (B) 211:75–129.

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1884. Supplement to the Descriptive Catalogue of Fishes of Australia. Proceedings of the Linnean Society of New South Wales, 9:2–64.

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1952a. The Manihine Expedition to the Gulf of Aquaba, 1948–49, IX: Fishes. Bulletin of the British Museum (Natural History), Zoology, 1(8):221–252, 5 figures.

1952b. Recent Biological Investigations in the Red Sea. Endeavour, 11:137–142.

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1964. Fishes of the Great Barrier Reef and Coastal Waters of Queensland. 566 pages, 136 plates. Sydney: Angus and Robertson.

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1876. Die preussische Expedition nach Ost-Asien, Zoologische Abtheilung. 2 volumes. Berlin.

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1955. Fish Morphology and Hierarchy. Parts 1 and 2, pages 1–1605, 135 plates (461 figures), 267 text-figures. Tokyo.

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1927. Handlist of Manchurian Vertebrates.

1952. Check List of the Fishes of Korea. Memoirs of the Hyogo University of Agriculture, Biological Series, 1:1–228.

Munro. I. S. R.

1955. The Marine and Fresh Water Fishes of Ceylon. Pages 1–XVI +1–349, 56 plates, Sydney: Halstead Press.

1958. The Fishes of the New Guinea Region: A Check List of the Fishes of New Guinea Incorporating Records of Species Collected by the Fisheries Survey Vessel “Fairwind” during the Years 1948 to 1950. Fisheries Bulletin of the Department of Agriculture, Stock and Fisheries (Papua and New Guinea), 1:97–369, 1 figure.

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1952. The Nature of Systematic Biology and of Species Description. Systematic Zoology, 1(3): 106–111.

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Plates

PLATE 1.—Cynoglossus canariensis Steindachner: a, lateral view of ocular side of specimen 325 mm SL (USNM 188435) from Lagos coast, Nigeria; b, enlarged view of anterior part of same. Cynoglossus monodi Chabanaud: c, lateral view of ocular side of specimen 314.0 mm SL (USNM 188434) from Lagos coast, Nigeria; d, enlarged view of anterior part of same.

PLATE 2.—Cynoglossus senegalensis (Kaup): a, lateral view of ocular side of specimen 355.0 mm SL (USNM 247424) from Lagos coast, Nigeria; b, enlarged view of anterior part of same. Cynoglossus dubius Day: c, lateral view of ocular side of specimen 370.0 mm SL (SOSC A 23) from Arabian Sea; d, enlarged view of anterior part of same.

PLATE 3.—Cynoglossus borneensis (Bleeker): a, lateral view of ocular side of specimen 271.0 mm SL (CAS., Vanderbilt collections, Reg 2582) from Shakon Province, ¾ miles off shore, Gulf of Thailand; b, enlarged view of anterior part of same. Cynoglossus browni Chabanaud: c, lateral view of ocular side of specimen 305.0 mm SL (USNM 188437) caught off the coast of Nigeria; d, enlarged view of anterior part of same.

PLATE 4.—Cynoglossus bilineatus (Lacépède): a, lateral view of ocular side of specimen 310.0 mm SL from Hong Kong; b, enlarged view of anterior part of same. Cynoglossus attenuatus Gilchrist: c, lateral view of ocular side of specimen 244.0 mm SL (ANSP 88867) from Delagoa Bay, South Africa; d, enlarged view of anterior part of same.

PLATE 5.—Cynoglossus lachneri Menon: a, lateral view of ocular side of specimen 226.0 mm SL from Silhoutte Bay, Seychelles; b, enlarged view of anterior part of same. Cynoglossus dispar Day; c, lateral view of ocular side of specimen 303.0 mm SL (SOSC A 23) from Karachi, west of Astola Island, Pakistan, lat. 23°06′35″N, long. 63°48′65″E; d, enlarged view of anterior part of same.

PLATE 6.—Cynoglossus kopsi (Bleeker): a, lateral view of ocular side of specimen 178 mm SL (USNM 137982) from China Sea, near Hong Kong; b, enlarged view of anterior part of same. Cynoglossus joyneri Günther: c, lateral view of ocular side of specimen 166.0 mm SL (KU 26965) from Omuta, Fukuoka Prefecture, Japan; d, enlarged view of ocular side of anterior part of same.

PLATE 7.—Cynoglossus itinus (Snyder): a, lateral view of ocular side of specimen 124.0 mm SL (USNM 72023) from Tanegashima, Japan; b, enlarged view of anterior part of same. Cynoglossus maculipinnis Rendahl: c, lateral view of ocular side of specimen 102.0 mm SL (WAM P 11729) of C. maculipinnis from Exmouth Gulf; d, enlarged view of anterior part of same.

PLATE 8.—Cynoglossus broadhursti Waite: a, lateral view of ocular side of specimen 214.0 mm SL (WAM P 14741) from Shark Bay, Western Australia; b, enlarged view of anterior part of same. Cynoglossus ecaudatus Gilchrist: c, lateral view of ocular side of specimen 150.0 mm SL (SOSC Ref. No. 145) from Somali coast; d, enlarged view of anterior part of same.

PLATE 9.—Cynoglossus cadenati Chabanaud: a, lateral view of ocular side of holotype 145.0 mm SL (MNHP 49.20) from Senegal, west Africa; b, enlarged view of anterior part of same. Cynoglossus sinusarabici Chabanaud: c, lateral view of specimen 83.0 mm SY (MNHP 1967.600); d, enlarged view of ocular side of anterior part of same.

PLATE 10.—Cynoglossus sealarki Regan: a, lateral view of ocular side of paralectotype 182.0 mm SL (BMNH 1908.23.155) from Saya-de-malha Bank; b, enlarged view of anterior part of same. Cynoglossus zanzibarensis Norman: c, lateral view of ocular side of specimen, 154.0 mm SL (SOSC Ret No. 170) from Mozambique coast, lat. 25°12′S,. long. 40°31′E; d, enlarged view of anterior part of same.

PLATE 11.—Cynoglossus capensis (Kaup): a, lateral view of ocular side of neotype 167.0 mm SL (BMNH 1897.10.85) from Saldanha Bay; b, lateral view of anterior part of same. Cynoglossus arel (Schneider): c, lateral view of ocular side of specimen 348.00 mm SL (SOSC Ref 334) from Porto Novo, Madras, lat. 11°32′N, long. 79°53′E; d, enlarged view of ocular side of anterior part of same.

PLATE 12.—Cynoglossus robustus Günther: a, lateral view of ocular side of specimen 340.0 mm SL (USNM 56386) from Japan; b, enlarged view of ocular side of anterior part of same. Cynoglossus lingua (Hamilton-Buchanan): c, lateral view of ocular side of specimen 315.0 mm SL (CAS George Vanderbilt collection 2582) from Gulf of Thailand; d, enlarged view of anterior part of same.

PLATE 13.—Cynoglossus cynoglossus (Hamilton-Buchanan); a, lateral view of ocular side of specimen 116.0 mm SL (ZSI 1499) from Calcutta; b, enlarged view of anterior part of same. Cynoglossus semifasciatus Day: c, lateral view of ocular side of specimen 114.0 mm SL (SOSC Ref 334) caught off Thirumulli Vasal Village, near Porto Novo, Madras; d, enlarged view of anterior part of same.

PLATE 14.—Cynoglossus macrostomus Norman: a, lateral view of ocular side of specimen 127.0 mm SL (SOSC Ref 334) from Neendakari, Kerala State; b, enlarged view of anterior part of same. Cynoglossus monopus (Bleeker): c, lateral view of ocular side of specimen 147.0 mm SL (GVF collection) from Gulf of Thailand; d, enlarged view of anterior part of same.

PLATE 15.—Cynoglossus puncticeps (Richardson): a, lateral view of ocular side of specimen 105.0 mm SL (GVF) from Gulf of Thailand; b, enlarged view of anterior part of same. Cynoglossus durbanensis Regan: c, lateral view of ocular side of specimen 153.0 mm SL (ANSP 63890) from Durban; d, enlarged view of anterior part of same.

PLATE 16.—Cynoglossus gilchrtsti Regan: a, lateral view of ocular side of specimen 90.5 mm SL (SOSC Ref 134) from Nossi Be, Madagascar; b, enlarged view of anterior part of same. Cynoglossus lida (Bleeker): c, lateral view of ocular side of specimen 180.0 mm SL (SOSC Ref 170) from Mozambique coast, lat. 19°09′S, long. 36°20′E; d, enlarged view of anterior part of same.

PLATE 17.—Cynoglossus carpenteri Alcock: a, lateral view of ocular side of specimen 179.0 mm SL (SOSC A 23) from Arabian sea, lat. 24°13′N, long. 65°52′E; b, enlarged view of anterior part of same. Cynoglossus acutirostris Norman: c, lateral view of ocular side of paralectotype 190.0 mm TL (USNM 109493) from the Gulf of Aden; d, enlarged view of anterior part of same.

PLATE 18.—Cynoglossus marleyi Regan: a, lateral view of ocular side of specimen 159.0 mm SL (SOSC) caught off Natal. Cynoglossus suyeni Fowler: c, lateral view of ocular side of specimen 247.0 mm SL (USNM 137944) from the Philippine-Celebes seas; d, enlarged view of anterior part of same.

PLATE 19.—Cynoglossus heterolepis Weber: a, lateral view of ocular side of specimen 138.0 mm SL (USNM 174028) from Northern Territory, Australia; b, lateral view of anterior part of same. Cynoglossus waandersi (Bleeker): c, lateral view of ocular side of specimen 73.0 mm SL (UMMZ 171680) from Morsi River at Mooara, Sumatra; d, lateral view of anterior part of same.

PLATE 20.—Cynoglossus semilaevis Günther: a, lateral view of ocular side of specimen 350 mm SL (BMNH 1939.1.17.56) from Hong Kong; b, enlarged view of anterior part of same. Cynoglossus abbreviatus Günther: c, lateral view of ocular side of specimen 270.0 mm SL (USNM) from Pearl River mouth. Hong Kong; d, enlarged view of anterior part of same.

PLATE 21.—Cynoglossus gracilis Günther: a, lateral view of ocular side of specimen 180.0 mm SL (USNM 86466) from China. Cynoglossus microlepis (Bleeker): b, lateral view of ocular side of specimen 215.0 mm SL (UMMZ 181238) from Cambodia; c, enlarged view of anterior part of same. Cynoglossus macrophthalmus Norman: d, lateral view of anterior half of ocular side of specimen 70.0 mm SL (AM 1A 6460) from Lindeman Island, Queensland, Australia.

____________

[1] In the Soleidae the lateral-line system of the blind side of the head region is well developed and various modifications of the scales of the lateral line are found. In Aseraggodes a row of thin cutaneous flaps is developed on the lateral line, the edges of which are serrated. In Heteromycteris and Soleichthys the cutaneous structures are hair-shaped and in the latter they are arranged on the lateral line like a brush. In Synaptura a well-serrated cutaneous flap occurs, in which the lateral-line canals are embedded (Ochiai, 1966:5). These extra cutaneous structures serve as tactile organs for these nocturnal bottom-feeding fishes in finding their prey. Similar filamentous processes are found on the blind side of the head in certain sole-like pleuronectid genera of the subfamily Rhombosoleinae, which also appear to have nocturnal habits (Norman, 1934:20).

[2] In the Soleidae and Archiridae the scales of the lateral line are much reduced, are enclosed in the skin, and are concealed by the two adjacent series.

[3] This bone is called “lame osseuse susbuccale” by Wu (1932) and “axonoste libra” or “pseudo-axonoste” by Chabanaud (1934b:284).

[4] This bone is called “axonoste epicranier anterior” by Chabanaud (1940:182).

[5] The bilineatus complex with two lateral lines on the blind side is considered less primitive than the canariensis complex, which has a single lateral line on the blind side purely on a zoogeographical basis. It is probable that the canariensis group evolved in west Africa from a form with two lateral lines on the blind side and dropped off one lateral line secondarily in the course of evolution (Carl L. Hubbs, pers. comm.).

[6] The eastern limit of the Soleidae is the Galapagos Islands, about 90°E (Aseraggodes herrei Scale), the western limit is the tropical west African coast of Senegal, about 15°W (Solea senegalensis Kaup), the northern limit is the North Sea and west coast of Ireland, and the southern limit is the Cape of Good Hope (Alagoa bay, etc.), about 34°S (Solea bleekeri Boulenger and Astroglossus pectoralis (Kaup), etc.).

[7] Day’s C. quinquelineatus has an incomplete third lateral line on the eyed side, a variation in the lateral-line system not uncommon in the genus.

[8] In one of the specimens examined from Lindeman Island, the dorsolateral line is absent, but the midlateral line is present.

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Front matter (preceding the text) should include: title page with only title and author and no other information, abstract page with author/title/series/etc., following the established format, table of contents with indents reflecting the heads and structure of the paper.

First page of text should carry the title and author at the top of the page and an unnumbered footnote at the bottom consisting of author's name and professional mailing address.

Center heads of whatever level should be typed with initial caps of major words, with extra space above and below the head, but with no other preparation (such as all caps or underline). Run-in paragraph heads should use period/dashes or colons as necessary.

Tabulations within text (lists of data, often in parallel columns) can be typed on the text page where they occur, but they should not contain rules or formal, numbered table heads.

Formal tables (numbered, with table heads, boxheads, stubs, rules) should be submitted as camera copy, but the author must contact the series section of the Press for editorial attention and preparation assistance before final typing of this matter.

Taxonomic keys in natural history papers should use the alined-couplet form in the zoology and paleobiology series and the multi-level indent form in the botany series. If cross-referencing is required between key and text, do not include page references within the key, but number the keyed-out taxa with their corresponding heads in the text.

Synonymy in the zoology and paleobiology series must use the short form (taxon, author, yearpage), with a full reference at the end of the paper under “Literature Cited.” For the botany series, the long form (taxon, author, abbreviated journal or book title, volume, page, year, with no reference in the “Literature Cited”) is optional.

Footnotes, when few in number, whether annotative or bibliographic, should be typed at the bottom of the text page on which the reference occurs. Extensive notes must appear at the end of the text in a notes section. If bibliographic footnotes are required, use the short form (author/brief title/page) with the full reference in the bibliography.

Text-reference system (author/year/page within the text, with the full reference in a “Literature Cited” at the end of the text) must be used in place of bibliographic footnotes in all scientific series and is strongly recommended in the history and technology series: “(Jones, 1910:122)” or “… Jones (1910:122).”

Bibliography, depending upon use, is termed “References,” “Selected References,” or “Literature Cited.” Spell out book, journal, and article titles, using initial caps in all major words. For capitalization of titles in foreign languages, follow the national practice of each language. Underline (for italics) book and journal titles. Use the colon-parentheses system for volume/number/page citations: “10(2):5–9.” For alinement and arrangement of elements, follow the format of the series for which the manuscript is intended.

Legends for illustrations must not be attached to the art nor included within the text but must be submitted at the end of the manuscript—with as many legends typed, double-spaced, to a page as convenient.

Illustrations must not be included within the manuscript but must be submitted separately as original art (not copies). All illustrations (photographs, line drawings, maps, etc.) can be intermixed throughout the printed text. They should be termed Figures and should be numbered consecutively. If several “figures” are treated as components of a single larger figure, they should be designated by lowercase italic letters (underlined in copy) on the illustration, in the legend, and in text references: “Figure 9b.” If illustrations are intended to be printed separately on coated stock following the text, they should be termed Plates and any components should be lettered as in figures: “Plate 9b.” Keys to any symbols within an illustration should appear on the art and not in the legend.

A few points of style: (1) Do not use periods after such abbreviations as “mm, ft. yds, USNM, NNE, AM, BC.” (2) Use hyphens in spelled cut fractions: “two-thirds.” (3) Spell out numbers “one” through “nine” in expository text, but use numerals in all other cases if possible. (4) Use the metric system of measurement, where possible, instead of the English system. (5) Use the decimal system, where possible, in place of fractions. (6) Use day/month/year sequence for dates: “9 April 1976.” (7) For months in tabular listings or data sections, use three-letter abbreviations with no periods: “Jan, Mar, Jun,” etc.

Arrange and paginate sequentially EVERY sheet of manuscript—including ALL front matter and ALL legends, etc., at the back of the text—in the following order: (1) title page, (2) abstract, (3) table of contents. (4) foreword and/or preface, (5) text, (6) appendixes, (7) notes, (8) glossary, (9) bibliography, (10) index, (11) legends.