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SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY • NUMBER 71

Keys to the of Oratosquilla (Crustacea: Stomatopoda), with Descriptions of Two New Species

Raymond B. Manning

SMITHSONIAN INSTITUTION PRESS

CITY OF WASHINGTON

1971

A B S T R A C T

Manning, Raymond B. Keys to the Species of Oratosquilla (Crustacea: Stomatopoda), with Descriptions of Two New Species. Smithsonian Contributions to Zoology, 71:1–16. 1970. Eight species groups are recognized within the stomatopod crustacean genus Oratosquilla, which contains twenty-three species from the Indo-West Pacific area. Keys to species groups and to species within each group are presented. Oratosquilla tweediei, from Singapore, and O. ornata, from Hong Kong, are newly described.

Official publication date is handstamped in a limited number of initial copies and is recorded in the Institution’s annual report, Smithsonian Year.

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Contents

Introduction

Acknowledgments

Indica Group

Nepa Group

Mikado Group

Investigatoris Group

Oratoria Group

Oratosquilla calumnia (Townsley, 1953)

Oratosquilla oratoria (De Haan, 1844)

Perpensa Group

Oratosquilla ornata, new species

Woodmasoni Group

Oratosquilla tweediei, new species

Gonypetes Group

Literature Cited

Publication in Smithsonian Contributions to Zoology

Keys to the Species of Oratosquilla (Crustacea: Stomatopoda), with Descriptions of Two New Species

Raymond B. Manning

____________

Raymond B. Manning, Chairman, Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560

Introduction

The genus Oratosquilla comprises many of the large squillids from the Indo-West Pacific region that formerly were placed in Squilla; Oratosquilla was separated from Squilla by Manning (1968a). The notes presented here originally were compiled for a revision of the genus, but it has become apparent that much more material from localities throughout the Indo-West Pacific region will have to be studied before such a revision can be made. It is hoped that this preliminary paper will stimulate interest in the group, aid identification of the known species, and help to make more material available so that a definitive revision can be prepared. Planned studies of the Albatross collections from the Philippine Islands, as well as the collections made during the International Indian Ocean Expeditions, should help to clarify the status of several species of Oratosquilla not reported here.

Although the genus Oratosquilla as currently composed appears to be homogeneous, eight distinct groups of species can be recognized, based primarily on characters of the raptorial claw and the carapace. Most of the species have 6 teeth on the raptorial claw, but one, O. indica (Hansen, 1926), has 7 or 8, another, O. investigatoris (Lloyd, 1907), has 10 to 18, and three, O. gonypetes (Kemp, 1911) and allies, have but 5. The mandibular palp is usually present; it is suppressed in O. indica. That species also differs from the other species in the genus in having but two epipods; the other species in the genus apparently have four epipods. The number of epipods could not be verified in the unique holotype of O. imperialis (Manning, 1965), in which two or three were visible; the remainder may have been damaged.

The median carina of the carapace affords good diagnostic features for distinguishing adults of most of the remainder of the species. The median carina, anterior to the cervical groove, usually terminates anteriorly in a well-marked anterior bifurcation (Figures 1a, 2a). In some species the branches of the bifurcation are present, but the median carina is interrupted at the base of the bifurcation (Figure 3a). In other species the branches of the bifurcation are completely suppressed (Figure 4a), although their position may be indicated by dark pigment, by a median depression, or by low tubercles or short, interrupted portions of the carina. The structure of the carina appears to be very stable in almost all species, so far as is known, between late juvenile stages and, perhaps, very old stages. In young specimens of species of Oratosquilla, especially postlarvae, the median carina and its bifurcation may not be distinct, as in the holotype of O. calumnia. In some species in which the anterior bifurcation is typically suppressed, as in O. gonypetes, it may be present at some later stage (Chopra, 1934; Manning, 1965, 1968b; Holthuis, 1967); O. gonypetes is the only species in which the structure of the median carina is variable, and the possibility exists that the specimens of that species reported from different areas actually represent distinct species.

By the recognition here of groups of species within Oratosquilla, I do not intend to imply that distinct subgenera should be recognized or that the complex relationships of species within the genus can be expressed adequately by the separation of the species into a series of arbitrary groups. The arrangement of species into these groups should facilitate their recognition. Nine of the twenty-three species of Oratosquilla have been described in the last fifty years, and it seems likely that several additional species will be recognized in the future. Familiarity with the species groups as outlined below and use of the key to species groups, as well as the keys to species within groups, should aid recognition of undescribed species as well as established ones.

Terms used in the keys and in the text have been explained in detail in earlier papers (Manning, 1966; 1968b).

All of the specimens are in the Division of Crustacea, National Museum of Natural History, Smithsonian Institution, where they are listed under United States National Museum (USNM) numbers.

The references given in brackets after each specific name in the keys are to papers in which additional information on each species can be found.

Acknowledgments

I thank L. S. Kornicker and J. Rosewater for their comments on the manuscript. The illustrations were prepared by my wife Lilly.

Key to Species Groups in Oratosquilla

Indica Group

This group contains O. indica (Hansen, 1926), which differs from other species of Oratosquilla in lacking both the mandibular palp as well as spines on the carinae of the anterior three abdominal somites and in having the dactylus of the raptorial claw armed with 7–8 teeth, rather than 5 or 6. The species was described in detail by Hansen (1926), and Chopra (1934) provided additional information.

Nepa Group

This group contains two species, O. nepa (Latreille, 1828) and O. holoschista (Kemp, 1911). The species can be recognized by: (1) the very small eyes, with corneal indices usually 600 or more in adults and the cornea set transversely on the stalk; (2) the shape of the anterior bifurcation of the carapace, which in both species opens posterior to the dorsal pit on the median carina; and (3) having 6 teeth on the claw. In all other species of Oratosquilla the anterior bifurcation, when present, opens anteriorly to the dorsal pit.

Key to Species of the Nepa Group

Mikado Group

In the two species assigned here, O. stridulans (Wood-Mason in Alcock, 1894) and O. mikado (Kemp and Chopra, 1921), the two lobes of the lateral process of the fifth thoracic somite are produced into two sharp spines and the lateral carinae of the anterior five abdominal somites are bicarinate. Kemp and Chopra (1921) previously noted that these features will distinguish these two species from the remainder of the species in the genus. Both species have 6 teeth on the claw.

As I noted in 1965, Squilla zanzibarica Chopra, 1939, appears to be a synonym of the species now known as O. mikado (Kemp and Chopra, 1921).

Key to Species of the Mikado Group

Investigatoris Group

This group also contains one species, O. investigatoris (Lloyd, 1907), which can be distinguished by the large number of teeth on the dactylus of the claw, 10–18. The eyes of O. investigatoris are comparatively larger than in most other species of Oratosquilla. Only in O. quadraticauda (Fukuda) are the eyes of comparable size, about one-third the carapace length; O. quadraticauda, however, has but 5 teeth on the claw as well as a median carina on the rostral plate. Kemp (1913) and Chopra (1939) have provided additional data on O. investigatoris.

Oratoria Group

This group contains the four species with 6 teeth on the claw, and in which the median carina of the carapace is well formed for all of its length anterior to the cervical groove; it is not interrupted at the bifurcation, and both branches of the bifurcation are distinct. The species included in this group are O. oratoria (De Haan, 1844), O. mauritiana (Kemp, 1913), O. kempi (Schmitt, 1929), and O. calumnia (Townsley, 1953). In all four species the carpus of the raptorial claw is ornamented with several tubercles. Oratosquilla oratoria and O. calumnia are diagnosed herein.

Key to Species of the Oratoria Group

Oratosquilla calumnia (Townsley, 1953)

FIGURE 1

Squilla nepa.—Brooks, 1886, p. 25 [part, specimen from Hawaii only; not S. nepa Latreille].

Squilla calumnia Townsley, 1953, p. 410, figs. 8–9.—Manning, 1968a, p. 135 [listed].

Squilla oratoria.—Kemp, 1913, p. 68 [part, specimens from Hawaii only].—Edmondson, 1921, p. 287, fig. 1a.—Bigelow, 1931, p. 183.—Townsley, 1953, p. 404, figs. 2–3 [not Squilla oratoria De Haan].

MATERIAL.—1 art, 26 mm; Hilo Dock, Hilo, Hawaii; night light; Territory of Hawaii Division of Fish and Game; 24 August 1948; holotype; USNM 93097.—1 art, 89 mm; Hilo, Hawaii; Albatross; 1901; USNM 64909.—1 damaged art, CL 35.0 mm; Honolulu; Albatross; 1901; USNM 64908.—1 art, 175 mm; estuary, Oahu, Honolulu; R. A. Kinzie III; USNM 125051.

DIAGNOSIS.—Rostral plate as long as or slightly longer than broad, apex usually rounded; eye large, cornea set obliquely on stalk, corneal indices 391–500; anterior width of carapace about half median length; median carina of carapace entire, bifurcation opening anterior to dorsal pit, distance from pit to bifurcation less than distance from bifurcation to anterior margin; raptorial claw with 6 teeth, dorsal ridge of carpus of claw bituberculate, inferodistal angle on outer face of merus with blunt tooth; mandibular palp and 4 epipods present; lateral process of fifth thoracic somite produced into an anterior spine and a slender posterior spine, directed laterally; lateral process of sixth thoracic somite bilobed, anterior lobe rounded; lateral process of seventh thoracic somite bilobed, anterior lobe angled, occasionally sharp; lateral carinae of abdomen not bicarinate; abdominal carinae spined as follows: submedian (3) 4–6, intermediate 1–6, lateral 1–6; telson lacking supplementary dorsal tubercles; telson denticles 3–4, 6–8, 1; proximal segment of uropodal exopod less than 1.5 times as long as distal segment; inner spine of basal prolongation of uropod with rounded lobe on outer margin, proximal margin of lobe concave.

COLOR.—Posterior 3 thoracic and all abdominal somites each with dark posterior line; second abdominal somite with rectangular patch of dark chromatophores medially; distal half of proximal segment and inner half of distal segment of uropodal exopod dark; distal half of endopod dark.

FIGURE 1.—Oratosquilla calumnia (Townsley), female, TL 89 mm, Hawaii: a, anterior portion of body; b, eye; c, carpus of raptorial claw; d, lateral processes of fifth, sixth, and seventh thoracic somites; e, basal prolongation of uropod. (Setae omitted.)

MEASUREMENTS.—Only male examined, TL 26 mm; females, TL 89–175 mm. Specimens ranging from 120–200 mm in length have been recorded in the literature. Other measurements of female, TL 175 mm: carapace length 36.5; anterior width of carapace 18.4; cornea width 7.7; rostral plate length 5.6, width 5.4; telson length 33.5, width 32.6.

REMARKS.—It is with some hesitation that I identify the adult specimens from Hawaii reported here with O. calumnia. The type of O. calumnia is a juvenile male that shows almost none of the diagnostic features of adults; the presence of six teeth on the claw, the mandibular palp, four epipods, and the faintly bilobed lateral processes of the exposed thoracic somites suggest that it can be identified as an Oratosquilla. The carinae of the carapace are indistinct and the anterolateral spines of the carapace as well as most of the spines found on the abdominal carinae are not developed.

The only other species of Oratosquilla recorded from the Hawaiian Islands is O. quadraticauda (Fukuda) (see Townsley, 1953, under Squilla boops), which differs from the species reported here in having but five teeth on the dactylus of the claw. It seems likely that Townsley’s juvenile holotype is conspecific with adults identified here as O. calumnia. The identity of that juvenile probably cannot be proved until similar specimens are related to an identifiable size.

Oratosquilla calumnia resembles O. oratoria in having an entire median carina on the carapace, but can be distinguished from O. oratoria by the spined submedian carinae of the fourth abdominal somite, which are never found in O. oratoria. Oratosquilla calumnia also differs from O. oratoria in color pattern, for none of the specimens of the latter species examined by me has the well-formed rectangular patch of dark chromatophores on the second abdominal somite characteristic of O. calumnia.

Oratosquilla calumnia closely resembles O. mauritiana in almost all respects. The two species are so similar that they may prove to be terminal populations of a widely distributed species in the Indo-West Pacific region. Specimens have not been recorded from intermediate areas, however, and, until such are found, it seems better to recognize both as distinct species. Oratosquilla mauritiana appears to be a much smoother species, its dorsal surface presenting, when dried, an appearance similar to O. woodmasoni rather than O. oratoria. A good feature for distinguishing the two species is the shape of the lateral processes of the exposed thoracic somites. In O. calumnia the anterior lobe of the lateral process of the sixth somite is broader than that found in O. mauritiana; the anterior lobe of the lateral process of the seventh somite is sharp in O. calumnia, rounded in O. mauritiana. The intermediate carinae of the first abdominal somite are armed posteriorly in O. calumnia, unarmed in O. mauritiana.

DISTRIBUTION.—Pacific Ocean, where it has been recorded from the Hawaiian Islands and Guam.

Oratosquilla oratoria (De Haan, 1844)

FIGURE 2

Squilla oratoria De Haan, 1844, atlas, pl. 51: fig. 2; 1849, p. 223.—Kemp, 1913, p. 66, pl. 5: figs. 54–56 [part; older references].—Zaks, 1933, p. 73.—Holthuis, 1941, p. 247 [older references].—Shiino, 1942, pp. 77 et seq., pls. 4–14 [embryology].—Gurney, 1946, p. 160 [listed; larvae].—Anonymous, 1949, p. 842, fig. 2418.—Liu, 1949, p. 36, figs. 1a–b—?Dawydoff, 1952, p. 145.—?Serène, 1953, p. 507 [listed].—Kobyakova, 1955, p. 199.—Utinomi, 1956, p. 91, pl. 46: fig. 1 [color].—Kubo and Asada, 1957, pp. 254, 257, 258, 259, 264, 265, 266, 268, 270, 272, 287, 289, tables 16–18, fig. 12 [ecology].—Kubo et al., 1959, pp. 1 et seq., figs. 1–16 [biology].—Utinomi, 1960, p. 114, pl. 57: fig. 8 [color].—Manning, 1965, p. 259—Lee and Wu, 1966, p. 50.—Manning, 1968a, p. 135 [listed].

Oratosquilla oratoria.—Manning, 1968a, figs. 1c, 2d–f, 3b, 5e, 7c–d, 9e.

Not Squilla oratoria.—Edmondson, 1921, p. 287, fig. la.—Bigelow, 1931, p. 183.—Townsley, 1953, p. 404, figs. 2–3 [= O. calumnia (Townsley, 1953)].

MATERIAL.—53 art, 88–180 mm; 43 art, 54–183 mm, in twenty-nine lots from scattered localities between southern Japan and Hong Kong, including localities off Korea and China.

DIAGNOSIS.—Rostral plate broader than long, lacking median carina, anterior margin truncate; eye large, cornea set obliquely on stalk; anterior width of carapace subequal to or slightly larger than half of median length; median carina of carapace entire, bifurcation opening anterior to dorsal pit; raptorial claw with 6 teeth, dorsal ridge of carpus tuberculate, inferodistal angle on outer face of merus with blunt spine; mandibular palp and 4 epipods present; lateral process of fifth thoracic somite produced into an anterior spine and a posterior angled lobe; lateral processes of sixth and seventh thoracic somites bilobed, anterior lobes smaller than posterior; lateral carinae of abdomen not bicarinate; abdominal carinae spined as follows: submedian 5–6, intermediate 3–6, lateral 2–6; telson lacking supplementary dorsal tubercles; telson denticles 3–5, 6–10, 1; proximal segment of uropodal exopod subequal to distal segment in length; inner spine of basal prolongation of uropod with rounded lobe on outer margin, proximal margin of lobe concave.

COLOR.—Completely faded in the present material. Apparently the species lacks the dark dorsal patches on the second or on the second and fifth abdominal somites that may be found in several other species in the genus. Color illustrations have been given by Utinomi (1956, 1960).

MEASUREMENTS.—Males, TL 88–180 mm; females, TL 54–183 mm. Other measurements of a male, TL 153 mm: carapace length 31.3; anterior width of carapace 17.1; cornea width 6.9; rostral plate length 4.0, width 4.6; telson length 28.4, width 28.3.

REMARKS.—I have included a diagnosis and an illustration for this well-known and relatively well-illustrated species, for there has been some confusion in the past over its identity; the brief diagnosis given here should separate it from all known species of Oratosquilla and should allow its ready separation from similar species that may occur with it in the northwestern Pacific, including O. interrupta (Kemp), O. perpensa (Kemp), O. kempi (Schmitt), and O. imperialis (Manning).

Only three groups of species in Oratosquilla have an entire median carina on the carapace, with the anterior bifurcation not interrupted basally and the anterior branches of the bifurcation well-formed. The sharply spined, laterally directed processes of the fifth thoracic somite will distinguish the two species of the Mikado Group, O. mikado (Kemp and Chopra) and O. stridulans (Wood-Mason), from the species in the Oratoria Group. The two species of the Nepa Group, O. nepa (Latreille) and O. holoschista (Kemp), differ from the species of the Oratoria Group in having much smaller eyes and in having the bifurcation of the median carina of the carapace opening posteriorly to the dorsal pit on the carapace.

FIGURE 2.—Oratosquilla oratoria (De Haan), female, TL 99 mm, Amoy, China: a, anterior portion of body; b, eye; c, carpus of raptorial claw; d, lateral processes of fifth, sixth, and seventh thoracic somites; e, basal prolongation of uropod. (Setae omitted.)

The four species of the Oratoria Group are very similar in basic facies. Both O. calumnia (Townsley), from Hawaii and Guam, and O. mauritiana (Kemp), from the western Indian Ocean, differ from O. oratoria in having the submedian carinae of the fourth abdominal somite armed posteriorly. The fourth species in the group, O. kempi (Schmitt), which has approximately the same geographic range as O. oratoria, differs in having a sharp median carina on the rostral plate and dark dorsal patches on the second and fifth abdominal somites. In addition, O. kempi lacks the spine on the outer face of the merus of the claw and does not have a strongly bilobed lateral process on the seventh thoracic somite.

The corneal indices appear to be reliable characters in Oratosquilla; the following indices were found in specimens of O. oratoria reported here.

I could detect no obvious differences in the corneal indices of males and females or in specimens from different areas.

The biology of this species is reasonably well known. Komai (1924) reported on embryology, Komai and Tung (1929) gave an almost complete account of larval development. Kubo and Asada (1957) and Kubo et al. (1959) reported on the ecology of the species in Tokyo Bay.

DISTRIBUTION.—Northwestern Pacific Ocean, from Peter the Great Bay, Russia, and Japan southward to Hong Kong, including Korea, Taiwan, and China. Although it has been recorded from Viet Nam by Gravier (1930, 1937), Dawydoff (1953), and Serène (1937, as Squilla affinis; 1953), it was not listed from there by Serène (1954). Its occurrence in the Philippine Islands, as recorded by Roxas and Estampador (1930), requires verification. One specimen from the Philippines identified by Miers (1880) as Squilla nepa was reidentified by Kemp (1913) as S. oratoria; Kemp noted, however, that the specimen had an interrupted median carina on the carapace and armed submedian carinae on the fourth abdominal somite, so it may be referable to O. fabricii (Holthuis).

Hansen (1926) recorded a small specimen, 18 mm in length, taken by the Siboga in the Molo Strait, Indonesia; that record should be accepted with caution, for specimens that small generally do not exhibit many of the diagnostic features seen in adults, and the record is well south of the documented range of the species.

Perpensa Group

This group comprises those species in which the median carina of the carapace is interrupted at the base of the anterior bifurcation; the carina, posterior to the bifurcation, and the branches of the anterior bifurcation as well are well formed. Two subgroups can be recognized in the group, one containing two species, characterized by a tuberculate ridge on the carpus on the raptorial claw, and the other with four species, characterized by an unbroken, smooth ridge on the carpus of the claw. The first subgroup contains O. interrupta (Kemp, 1911) and O. fabricii (Holthuis, 1941). The second subgroup contains O. perpensa (Kemp, 1911), O. inornata (Tate, 1883), O. imperialis (Manning, 1965), and O. ornata, new species, described below.

Key to Species of the Perpensa Group

I can find no characters to separate O. imperialis (Manning, 1965), described from Japan, from O. simulans (Holthuis, 1967), based on material from the Red Sea. Although I have not been able to compare specimens of both species, comparison of their descriptions leaves me no alternative to synonymizing them. The two species are almost identical in morphology and color pattern. I reported that the type of O. imperialis had 2 or 3 epipods; Holthuis reported 4 epipods in O. simulans. It is possible that the eipods of the unique type of O. imperialis were damaged. The distribution of O. imperialis, known from localities in the Red Sea and from Japan but not from intermediate localities, parallels that of O. mikado, which is known from Japan and Zanzibar. It seems likely that these distribution patterns, which are at best unusual in Oratosquilla in which most species have restricted ranges, reflect availability of collections or collecting effort rather than true discontinuous distribution patterns within the Indo-West Pacific region.

Oratosquilla ornata, new species

FIGURE 3

HOLOTYPE.—1 art, 43.5 mm; China Sea, off Hong Kong; 21°53’N, 115°51′E; 62 fathoms; sand, green mud; Albatross Station 5309; 4 November 1908; USNM 77939.

DIAGNOSIS.—Rostral plate as long as broad, appearing elongate, lacking median carina, apex rounded; eye large, cornea set obliquely on stalk; corneal index 426; anterior width of carapace less than half median length; median carina of carapace interrupted at base of bifurcation, bifurcation opening anterior to dorsal pit; raptorial claw with 6 teeth, dorsal ridge of carpus entire, inferodistal margin of outer face of merus at most angled; mandibular palp and 4 epipods present; lateral process of fifth thoracic somite produced into an anterior spine and a posterior angled lobe; lateral processes of sixth and seventh thoracic somites bilobed, anterior lobe of process of sixth somite truncate laterally, almost as large as posterior lobe; lateral carinae of abdomen not bicarinate; abdominal carinae spined as follows: submedian 5–6, intermediate 3–6, lateral 2–6; telson without supplementary dorsal tubercles; telson denticles 4, 8, 1; proximal segment of exopod longer than distal; inner spine of basal prolongation of uropod with sharp spine on outer margin, proximal margin of spine concave.

FIGURE 3.—Oratosquilla ornata, new species, female holotype, TL 43.5 mm, off Hong Kong: a, anterior portion of body; b, eye; c, carpus of raptorial claw; d, lateral processes of fifth, sixth, and seventh thoracic somites; e, basal prolongation of uropod. (Setae omitted.)

DESCRIPTION.—Dorsal surface of body pitted, rugose. Eye large, cornea bilobed, set very obliquely on stalk; eyes not extending to end of first segment of antennular peduncle; ocular scales truncate, inclined laterally, separate mesially; anterior margin of ophthalmic somite flattened; corneal index 426.

Antennular peduncle slightly shorter than carapace; dorsal processes of antennular somite flattened, directed anterolaterally.

Antennal scale slender, curved, elongate, more than half as long as carapace.

Rostral plate slender, length and width subequal, appearing elongate, upturned lateral margins converging on rounded apex; median carina absent.

Carapace narrowed anteriorly, anterior width less than half median length; anterolateral spines strong but not extending to base of rostral plate; median carina interrupted at base of anterior bifurcation, branches of bifurcation distinct; distance from dorsal pit to anterior bifurcation less than distance from bifurcation to anterior margin; portion of median carina posterior to cervical groove with anterior bifurcation; intermediate carinae not extending to anterior margin; posterolateral margin of carapace evenly curved, not angled anteriorly; median posterior margin of carapace with triangular projection.

Dactylus of raptorial claw with 6 teeth, outer margin of dactylus evenly curved; dorsal ridge of carpus undivided; inferodistal margin of outer face of merus with unarmed angular lobe.

Mandibular palp and 4 epipods present.

Exposed thoracic somites with irregular submedian and intermediate carinae; lateral process of fifth somite bilobed, anterior lobe a slender spine, outer margin convex, directed anteriorly, posterior lobe short, bluntly triangular, directed laterally; lateral process of sixth somite bilobed, anterior lobe truncate, almost as large as posterior, apex acute but not spined; lateral process of seventh somite bilobed, anterior lobe triangular, posterior lobe larger, triangular; ventral keel of eighth somite erect, triangular, apex rounded.

Anterior 5 abdominal somites each with 8 carinae, submedians slightly divergent on each somite; sixth somite with 6 pairs of carinae; abdominal carinae spined as follows: submedian 5–6, intermediate 3–6, lateral 2–6, marginal 1–5; sixth somite with small ventrolateral spinule in front of articulation of each uropod and with median tubercle on posterior margin of sternum.

Telson flattened, longer than broad, with 6 elongate marginal teeth; prelateral lobes present, not markedly projecting laterally, shorter than lateral carina; dorsal surface of telson ornamented with median carina and carinae of marginal teeth, supplementary tubercles or carinae absent; median carina low, sharp, with obscure anterior notch and long distal spine; outer submedian denticle rounded, remainder sharp, 4, 8, 1; ventral surface of telson with short but prominent postanal keel.

Uropods slender, elongate, proximal segment of exopod longer than distal, with 9 graded spines on outer margin, distalmost not extending to mid-length of distal segment; endopod slender, inner margin concave; lobe on inner spine of basal prolongation of uropod a slender erect spine, margin concave.

COLOR.—Completely faded in holotype.

MEASUREMENTS.—Female holotype, TL 43.5 mm, only known specimen; other measurements, in mm: carapace length 9.8; anterior width of carapace 4.0; cornea width 2.3; rostral plate length 1.4, width 1.4; telson length 8.2, width 6.9.

REMARKS.—Oratosquilla ornata can be distinguished from the other species of the Perpensa Group, including O. perpensa, O. inornata, and O. imperialis, by the presence of a slender spine rather than a rounded lobe between the spines of the basal prolongation of the uropod; as in the case of most of the species assigned to this group, the dorsal ridge on the carpus of the claw in O. ornata is undivided. This new species also has a much slenderer uropod than any of the members of the group.

Tirmizi and Manning (1968) observed that a slender spine replaced the rounded lobe between the spines of the basal prolongation of the uropod in O. hesperia from West Pakistan. In that species the spines were present in juveniles with a total length of approximately 50 mm or less, but in specimens larger than 100 mm the rounded lobe characteristic of adults was present. Alikunhi (1967) also noted that the spine was present in juveniles of O. woodmasoni from India. Thus the holotype of O. ornata may prove to be a juvenile. The basic facies of the unique holotype is adult, however, for the body carination and spination, usually poorly developed in specimens of this size, resemble that of larger specimens of other species.

NAME.—The name is from the Latin, ornatus, meaning decorate, alluding to the well-formed carinae of the abdomen and the elongate uropod.

DISTRIBUTION.—Known only from the type locality, off Hong Kong in the China Sea, at a depth of 62 fathoms.

Woodmasoni Group

Members of this group can be characterized by their broad, smooth carapace, with the anterior width of the carapace greater than one-half its median length and with the branches of the anterior bifurcation of the median carina of the carapace poorly developed or completely absent. The species assigned to this group include O. woodmasoni (Kemp, 1911), O. massavensis (Kossmann, 1880), O. hesperia (Manning, 1968), and O. tweediei, described below. Only two of the species, O. massavensis and O. hesperia, have the telson ornamented with dorsal tubercles on each side of the median carina of the telson. As in the species of the Oratoria Group, the carpus of the claw is tuberculate in members of the Woodmasoni Group.

In all four of the species placed in this group the body is relatively smooth, not so tuberculate as in O. oratoria, and the carapace is noticeably broader than in any of the other species in the genus. The carapace of O. woodmasoni is comparatively the broadest; in that species, the anterior width, at the base of the anterolateral spines, is usually greater than one-half the length of the carapace and rostral plate combined. In the other three species, the anterior length is greater than one-half the median length of the carapace, excluding the rostral plate.

Further investigation may show that there are several additional species in this complex; Chopra (1934), Holthuis (1941), and Manning (1966) all reported material from different localities that differs from Kemp’s (1913) account of O. woodmasoni based primarily on material from India.

Oratosquilla massavensis is not known to occur in the Indian Ocean adjacent to the Red Sea, but it is apparently very abundant in the latter area (Holthuis, 1967). It has been recorded from Viet Nam by Serène (1953, 1954); but in view of its apparent occurrence only in the Red Sea, Serène’s records may be based on another undescribed species with a broad carapace, smooth body, and dorsal tubercles on the telson.

Key to Species of the Woodmasoni Group

Oratosquilla tweediei, new species

FIGURE 4

HOLOTYPE.—1 art, 107 mm; Singapore; M. W. F. Tweedie, collector; 1934; USNM 76026.

PARATYPE.—1 art, 96 mm; data as in holotype; USNM.

DIAGNOSIS.—Rostral plate broader than long, lacking median carina, apex truncate; eye large, cornea set obliquely on stalk; corneal indices 332–337; anterior width of carapace more than half median length; anterior bifurcation of median carina of carapace absent; raptorial claw with 6 teeth, dorsal ridge of carpus tuberculate, inferodistal angle on outer face of merus bluntly angled; mandibular palp and 4 epipods present; lateral process of fifth thoracic somite produced into an anterior spine and a posterior angled lobe; lateral processes of sixth and seventh thoracic somites bilobed, anterior lobes sharper and smaller than posterior; lateral carinae of abdomen not bicarinate; abdominal carinae spined as follows: submedian 4–6, intermediate 3–6, lateral 2–6; telson lacking supplementary dorsal tubercles; telson denticles 3, 9, 1; distal segment of uropodal exopod longer than proximal; inner spine of basal prolongation of uropod with angled lobe on outer margin, proximal margin of lobe concave.

DESCRIPTION.—Dorsal surface of body smooth. Eye large, cornea bilobed, set very obliquely on stalk; eyes not extending beyond end of first segment of antennular peduncle; ocular scales truncate, inclined laterally, separate mesially; anterior margin of ophthalmic somite rounded; corneal indices 332–337 in types.

FIGURE 4.—Oratosquilla tweediei, new species, female holotype, TL 107 mm, Singapore: a, anterior portion of body; b, eye; c, carpus of raptorial claw; d, lateral processes of fifth, sixth, and seventh thoracic somites; e, basal prolongation of uropod. (Setae omitted.)

Antennular peduncle subequal to carapace; dorsal processes of antennular somite blunt, truncate, anterior margin almost transverse.

Rostral plate broader than long, trapezoidal, upturned lateral margins converging on truncate apex; median carina absent.

Antennal scale slender, short, more than half as long as carapace.

Carapace broad, anterior width greater than one-half median length; anterolateral spines of moderate size, not extending to base of rostral plate; median carina of carapace obscure anteriorly, branches of anterior bifurcation only faintly indicated; portion of median carina posterior to cervical groove with anterior bifurcation; intermediate carinae not extending to anterior margin; posterolateral margin of carapace evenly curved, not angled anteriorly; posterior margin with median projection.

Dactylus of raptorial claw with 6 teeth; outer margin of dactylus sinuate; dorsal ridge of carpus irregularly tuberculate, with 2–3 rounded distal tubercles; inferodistal angle of outer face of merus with blunt, triangular tooth.

Mandibular palp and 4 epipods present.

Posterior 3 thoracic somites with well marked, smooth submedian and intermediate carinae; fifth somite with faint indications of submedian carinae and with irregular tubercles at level of intermediate carinae of sixth somite; lateral process of fifth somite bilobed, anterior lobe a blunt spine directed anterolaterally, posterior lobe slender, sharp, directed laterally; lateral process of sixth somite bilobed, anterior lobe slender, sharp, recurved posteriorly, posterior lobe much larger, triangular, apex acute; lateral process of seventh somite bilobed, anterior lobe small, spiniform, posterior lobe much larger, apex acute; ventral keel of eighth somite low, rounded.

Anterior 5 abdominal somites each with 8 carinae, submedians subparallel on anterior somites, slightly divergent on fifth somite; sixth somite with 6 pairs of carinae; abdominal carinae spined as follows: submedian 4–6, intermediate 3–6, lateral 2–6, marginal 1–5; sixth somite with small ventrolateral spinule in front of articulation of each uropod and with low median carina on posterior half of sternum.

Telson flattened, slightly broader than long, with 6 slender marginal spines; prelateral lobes present, slightly projecting laterally, shorter than carina of lateral tooth; dorsal surface of telson ornamented with median carina and carinae of marginal teeth only, supplementary dorsal tubercles or carinae absent; median carina sharp, with anterior notch and long posterior spine flanked distally with 1 or 2 irregular tubercles; denticles rounded, 3, 9, 1; ventral surface with uninterrupted postanal keel.

Uropods stout, exopod with 7–9 short spines on outer margin of proximal segment; distal segment of exopod longer than proximal; endopod slender, curved; basal prolongation with triangular projection on outer margin of inner spine, inner margin of projecting lobe concave.

COLOR.—Almost completely faded in the types; dark pigment present on distal half of proximal segment and inner half of distal segment of uropodal exopod; distal two-thirds of uropodal endopod dark.

MEASUREMENTS.—Females only known, TL 96–107 mm. Other measurements, in mm, of holotype, TL 107 mm: carapace length 20.8; anterior width of carapace 12.9; cornea width 6.2; rostral plate length 3.1, width 4.8; telson length 18.8, width 19.2.

REMARKS.—Oratosquilla tweediei belongs to the Woodmasoni Group of species in the genus, all of which are characterized by the broad, smooth carapace on which the anterior bifurcation of the median carina is absent or nearly so. Oratosquilla tweediei agrees with O. woodmasoni (Kemp) and differs from both O. massavensis (Kossman) and O. hesperia (Manning) in lacking supplementary dorsal tubercles on the telson; in both O. massavensis and O. hesperia the median carina of the telson is flanked laterally by a line of tubercles that converge distally under the apical spine.

Oratosquilla tweediei closely resembles O. woodmasoni but can be distinguished from it by the following features: (1) the anterior width of the carapace is greater than one-half the median length, excluding the rostral plate; (2) the anterior lobes of the lateral processes of both sixth and seventh thoracic somites are sharper and more prominent; (3) the lateral process of the eighth somite is sharper (compare Figure 4d with Figure 63 in Kemp, 1913); (4) the submedian carinae of the fourth abdominal somite are armed posteriorly; and (5) the lobe on the inner spine of the basal prolongation of the uropod is much more prominent in O. tweediei than in O. woodmasoni (compare Figure 4e with Figure 65 in Kemp, 1913).

Oratosquilla woodmasoni and O. tweediei are the eastern counterparts of O. hesperia and O. massavensis in the Indo-West Pacific region; O. hesperia is known from the northwestern Arabian Sea, south to Madagascar, and O. massavensis apparently occurs only in the Red Sea (Tirmizi and Manning, 1968). Oratosquilla woodmasoni is known from localities between Hong Kong and western India (Kemp, 1913) and O. tweediei is known only from off Singapore.

This new species agrees with the specimen I reported in 1966 from off Bowen, Queensland, and differs from previous accounts of O. woodmasoni in having a well-developed lobe on the outer margin of the inner spine of the basal prolongation of the uropod. The Australian specimen, however, differs in having the anterior branches of the bifurcation of the median carapace; these carinae are completely lacking in both O. woodmasoni sensu stricto and in O. tweediei. It seems likely that the Australian specimen represents a distinct species.

The only other species in the genus with the submedian carinae of the fourth abdominal somite armed are: (1) O. nepa (Latreille), which differs in having very small eyes and in having the anterior bifurcation of the median carina of the carapace open posterior to the dorsal pit; (2, 3) O. mauritiana (Kemp) and O. calumnia (Townsley), both of which differ in having an entire median carina on the carapace with a well-developed anterior bifurcation; (4) O. fabricii (Holthuis), in which the median carina is interrupted but the anterior bifurcation is well formed; and (5, 6) O massavensis (Kossmann) and O. hesperia (Manning), both of which have supplementary dorsal tubercles on the telson. All of these species differ from O. tweediei in other features as well, but these are the most important differences.

NAME.—The species is named for M. W. F. Tweedie, who collected the specimens and donated them to the United States National Museum.

DISTRIBUTION.—Known only from the type locality, Singapore.

Gonypetes Group

This group contains three species, which have but 5 teeth on the dactylus of the claw, O. quadraticauda (Fukuda, 1911), O. quinquedentata (Brooks, 1886), and O. gonypetes (Kemp, 1911). In other respects the species in the Gonypetes Group resemble those in other groups with 6 teeth on the claw, especially the species of the Woodmasoni Group, which lack a well-formed anterior bifurcation on the median carina of the carapace. As Holthuis (1967) commented, these species are extremely difficult to identify when their raptorial claws are missing.

In 1965, I pointed out that Squilla boops Kemp was a synonym of S. quadraticauda Fukuda.

On the basis of his studies of stomatopod larvae and juvenile stages, Alikunhi (1967) suggested that O. gonypetes and its allies [O. quadraticauda and O. quinquedentata] are more closely related to the “Chloridella” [now Clorida] and “raphidea” [now Harpiosquilla] groups of species than are species of the “nepa” [Nepa, Perpensa, and Woodmasoni] groups.

Key to Species of the Gonypetes Group

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