ANNALS OF THE SOUTH AFRICAN MUSEUM ANNALE VAN DIE SUID-AFRIKAANSE MUSEUM Volume 69 Band June 1976 Junie Part 11 Deel ISOPODAN AND TANAIDACEAN CRUSTACEA FROM THE ST PAUL AND AMSTERDAM ISLANDS, SOUTHERN INDIAN OCEAN are issued in parts at irregular intervals as material becomes available word uitgegee in dele op ongereelde tye na beskikbaarheid van stof OUT OF PRINT/urr DRUK 1,2(1,3,5-8), 3(1-2,4-5, t.-pj.), 5(1-3, 5,7-9), 6(1, t.-p.L), 7(1-4), 8,9(1-2), 10(1), 11(1-2, 5, 7, t.-p.L), 15(5),24(2),27, 31(1-3), 33 Price of this part/Prys van hierdie deel R5,OO Trustees of the South African Museum ? Trustees van die Suid-Afrikaanse Museum 1976 Printed in South Africa by The Rustica Press, Pty., Ltd., Court Road, Wynberg, Cape In Suid?Afrika gedruk deur Die Rustica-pers, Edms., Bpk., Courtweg, Wynberg, Kaap ISOPODAN AND TANAIDACEAN CRUSTACEA FROM THE ST PAUL AND AMSTERDAM ISLANDS, SOUTHERN INDIAN OCEAN By BRIAN KENSLEY South African Museum, Cape Town (With 26 figures) [MS accepted 26 February 1976] ABSTRACT A collection of land and marine Isopoda and Tanaidacea from the St Paul and Amsterdam Islands, southern Indian Ocean, is dealt with. Three species of tanaids and thirty-four species of isopods are discussed. Of these, seven new species are described, viz. Eisothistos crateris, Panathura amstelodami, Cymodocella sapmeri, Munnogonium subtilis, Coulmannia unicornis, Echinomunna uroventralis, and 1anisera trepidus. The latter species belongs to the new genus Ianisera, while a species of Janira, viz. J. angusta Barnard, is transferred to the new genus laniroides. The isopod fauna is analysed into zoogeographical components. It is shown that there is a strong endemic fauna (27%), as well as a South American/Antarctic/Subantarctic and a widespread component, but by far the largest component (35 %) is that group common to the islands and South Africa (mostly the west coast of South Africa). It is concluded that the isopod fauna of the St Paul and Amsterdam Islands falls into the cold-temperate faunal category with strong affinities to the fauna of South Africa. PAGE Introduction. 261 Review of published work . 262 Species list . 263 Station list . 268 Systematic discussion . 271 Zoogeographical discussion 318 Acknowledgements . 321 References . 321 During 1971-2, a research programme centred on the St Paul and Amster- dam Islands was sponsored by Terres Australes et Antarctiques, with the logistic support of the Societe Anonyme de Peche Maritime et de Ravitaille- ment (S.A.P.M.E.R.). As part of this programme, J. Beurois of the Station Marine d'Endoume et Centre Oceanographie, Marseille, made extensive collections of invertebrates from these islands, both intertidally and subtidally. The marine and the few terrestrial isopods collected were submitted to the author for identification. The following is an account of the species found, with a discussion of their zoogeographical implications. Most of the type specimens are deposited in the Paris Museum of Natural History. A few para- types are deposited in the South African Museum, and are designated 'SAM'. REVIEW OF PUBLISHED WORK ON ISOPODA FROM THE ST PAUL AND AMSTERDAM ISLANDS The St Paul and Amsterdam Islands, situated at 38.438, 77.32E and 37.55S, 77.40E respectively (see fig. 1), almost midway in the southern Indian Ocean, and just north of the Subtropical Convergence, have been visited by biologists at infrequent intervals. The Austrian frigate Novara called at the islands during its circumnavigation of the earth in 1857-9. A preliminary report on the isopods by C. Heller was published in 1861, while the full report appeared in 1865. This dealt with five species of isopods and one tanaid: Idotea nitida, Clean tis granulosa, Porcellio paulensis, Sphaeroma per/orata, Cirolana rugicauda and Tanais gracilis. Brocchi (1877) reported on a collection of isopods made by Velain and d'Lisle during the French mission sent to observe the passage of Venus. Nine species were dealt with, viz. Idotea nitida, Porcellio paulensis, Sphaeroma per/orata, Sphaeroma tuberculata, Cymodoce picta, Cirolana rugicauda, Rocinela major and Cymothoa gadorum. This material, unfortunately, cannot be located and must be presumed lost. The German South-Polar Expedition of 1901-3 visited the islands on the Gauss. Vanh6ffen (1914) reported on the marine isopods, listing seven species and one tan aid : Cirolana rugicauda, Cycloidura per/orata, Dynamenella brunnea, Jaeropsis paulensis, Antias hispidus, Antias marmoratus, Janira sp. and Tanais gracilis. Budde-Lund (1906) dealt with the land isopods of this expedition and mentions Deto armata from St Paul. Finally, Andre (1932) lists three species, viz. Paridotea ungulata, Cycloidura per/orata and Porcellio paulensis. To date, the total number of isopods from the St Paul and Amsterdam Islands numbers 16 species, 4 of these being of uncertain identity. The present collection includes 35 species, bringing the total number of isopods to 44, this more-than-doubling of the number being a reflection of the very thorough collecting carried out by J. Beurois. Amsterdam Is s, P.';I Is SPECIES LIST In the following list, the species are arranged in the order in which they are dealt with in the systematic section. iiJ*-not dealt with in systematic section. 0'tI St Paul and Amsterdam habitat g and depth distribution General distribution >Z ~ Upper South America t:I SPECIES Littoral infralittoral Sublittoral Endemic South Africa Antarctic Other ~Z> TANAIDACEA S>Anatanais gracilis (Heller) . - among kelp under stones Liideritz to - Ceylon nmroots, stones and sponges, Durban ~25-50m nLeptochelia barnardi Brown - among kelp among stones Table Bay - - :00 roots and algae False Bay C'"Leptochelia savignyi (Kr6yer) . among kelp among stones Liideritz to North and ..,- - > roots and algae M09ambique and South Q Atlantic > Mediter- "11:00 ranean 0 Indo-Pacific ~'"ISOPODA 0c* Cleantis granulosa Heller under gravel - Argentina - ..,:t:and stones Tierra del m Fuego ~ Idotea metallica Bosc - on buoy cable Cape to Straits of Greenland, ZMo.;ambique Magellan Tristan ~Patagonia Nova ScotiaAntarctic 0Paridotea nitido (Heller) - among kelp among algae + - - - ~roots, stones, and spongesalgae,3-4m 25-30m Paridotea reticulata Barnard - on Macrocystis Liideritz to - - N 'leaves' 0-5 m False Bay 0-V.> St Paul and Amsterdam habitat IV0\and depth distribution General distribution .j:>. Upper South America SPECIES Littoral infralittoral Sublittoral Emlemic South Africa Antarctic Other Eisothistos erateris sp. noy. - from rock - +scrapings, on sponges, bryozoa >Panathura amstelodami sp. noy. - among kelp from rock, + - - - ~roots algae, sponges, SQ.-80m t""en Panathura serrieauda (Barnard) - among kelp - Liideritz to - - 0 roots, algae False Bay 'tl Cirolana rugieauda Heller . - among kelp, - Port Nolloth - - ~algae, stones, St Helena Bay ensponges in 0 organic ~debris, 0,6 m ~* Cymodoeea pieta BrocchiCymodoeella sapmeri sp. noy .. amongst algae among kelp among algae, + - - -roots, algae, sponges, ~1-4m bryozoa, 60 m Dynamenella brunnea amongst among kelp ~cVanhoffen algae, stones roots, stones, - + - - - entl1sponges, C 1-4m ~ Dynamenella dioxus Barnard . - among kelp from sponges, Liideritz to roots 3-4m algae, False Bay 2S-60m Parisocladus per/oratus intertidal amongst Rocky Point, (H. M. Edwards) pools among algae, in black - S.W.A.,to stones, algae sediment3m East London* Spheroma tubereulata Brocchi Limnoria quadripunetata Holthuis - in kelp roots in red algae Chile North Sea 30m California ? CymotlJoa gadorum Brocchi LirOMC4 raynoudii (H. M. Edwards) Aega antillensis SchiOdte & Meinert * Rocinela major Brocchi Stenetrium crassimanus Barnard Caecianiropsis ectiformis (VanhOffen) . on gill cover of Latris lineata on Thyrsites atun among kelp, algae among kelp, algae, sponges Table Bay New Zealand, Durban Japan, ....Tasmania, '"Australia ~g Natal Japan, ~West Indies ~among Table Bay, sponges, East London t:l corals, ~ 6D-70m ~S among algae, False Bay >ncorals, Natal ~sponges among algae, Saldanha Bay n~sponges, False Bay c: SD-90m Still Bay '" amongst Chile ~organic Kerguelendebris, algae, '11 sponges, from ~ coarse sand, s:: SD-80m '"0among algae, Auckland Is. c: sponges, Falkland Is. ~ in black Antarctic m sediment, ~ SD-60m ~ among algae, South Georgia sponges, stones, 0 4S-100m Q scrapings Kerguelen Is. ~ from boulder among algae, False Bay tv sponges, 2Sm 0'\VI St Paul and Amsterdam habitat tv and depth distribution General distribution 0'10'1 Upper South America SPECIES Littoral infralittoral Sublittoral Endemic South Africa Antarctic Other Ianisera trepidus sp. novo - - among + sponges, bryozoa, ~ corals, 3O-l00m Janira capensis Barnard - among kelp among stones, Liideritz to - - l'"''"roots on algae, False Bay 0Macrocystis sponges, "ll 0,6m bryozoa ~Ianiropsis palpalis Barnard among algae, among algae, among stones, Liideritz to - -stones, sponges, kelp sponges, East London ~ intertidal 0,6m algae, c:: pools bryozoa, on ~ gorgonian, ~4o-l20m ~Jaeropsis beuroisi Kensley . - among kelp among corals, + - - - ~roots 0,3 m bryozoa, sponges, a:: 2S-S0m ~Jaeropsis paulensis Vanhoffen . - among kelp on sponges, - Gough Is. - roots, stones, bryozoa a:: organic debris Munnogonium subtilis sp. novo - - So-60m +Coulmannia unicornis sp. novo - - SO-100m +Echinomunna. uroventralis sp. novo - - on bryozoa, + corals, sponges Munna nana Nordenstam . - on kelp roots, among algae, Chile among Ulva corals, Falkland Is. 0,6m bryozoa, sponges, SO-120m upper and mid-littoral crevices, under stones feeding on kelp washed ashore on coral, sponges, SO-100m Rocky Point, S.W.A.,to Knysna Tristan da Cunha, St Helena Is. AMSTERDAM ISLAND (AMS) Station No. Date Depth (metres) bl b2/1a b2/1b b2/2 b3 cl 10.2.1971 10.2.1971 11.2.1971 11.2.1971 11.2.1971 11.2.1971 27.2.1971 27.2.1971 27.2.1971 12.2.1971 12.2.1971 12.2.1971 12.2.1971 14.2.1971 14.2.1971 14.2.1971 9.2.1971 19.2.1971 19.2.1971 19.2.1971 22.2.1971 23.2.1971 23.2.1971 24.2.1971 27.2.1971 9.3.1971 9.3.1971 9.3.1971 5.12.1971 5.12.1971 11.12.1971 13.12.1971 13.12.1971 14.12.1971 upper infralittoral upper infralittoral upper infralittoral upper infralittoral midlittoral between midlittoral and sublittoral littoral lower midlittoral midlittoral upper infralittoral midlittoral midlittoral upper infralittoral upper infralittoral low tide 0,5 40-50 midlittoral upper midlittoral midlittoral upper sublittoral 120 80-100 SO-I 00 So-loo Locality and ecological data north coast; obtained from scraping 400 cms amongst abundant algae north coast; obtained from scraping 400 ems amongst Ulva and Splachnidium north coast; obtained from scraping 400 ems amongst Splachnidium north coast; among rock crevices and kelp holdfasts north coast; in Laminaria holdfasts north coast, amongst algae north coast, under stones, and in clean sediment north coast, under stones north coast among boulders north coast, in wet sediment north - north-east coast; amongst algae and sponges north - north-east coast; amongst small molluscs and algae north-north-east coast north-north-east coast amongst Porphyra and Splachnidium north - north-east coast under stones east coast; scrapings from algal growth on wall east coast; scrapings from wall east coast; scrapings from cavity north coast; algae from lobster pot north coast, from Macrocystis holdfast washed ashore north coast, from Macrocystis holdfast washed ashore north coast, from Laminaria holdfast north coast, from Lominaria holdfast north coast, under stones north coast, natural tide-pool north coast, under stones south-east coast from lobster pot north coast, under stones north coast, in tide-pools north coast north coast, amongst red algae on Macrocystis fronds north-east coast, from coralligenous bottom, with bryozoa, sponges, and corals north-east coast, from coralligenous bottom north-east coast from antipatharian epifauna north-east coast, from encrusting fauna of stones, sponges, bryozoans, etc. north-east coast, from antipatharian epifauna Station No. Date Depth (metres) Locality and ecological data 48 16.12.1971 80-100 north-east coast from bryozoans encrusting antipatharian trunk 60 2.1.1972 80-100 south-east coast from gorgonacian Acanthogorgia 64a 3.1.1972 80 south-east coast epifauna from cable sub- merged for one year 64b 3.1.1972 south-east coast, from buoy and 3-metre floating cable 73 6.1.1972 80-100 north-east coast, from coralligenous bottom 74 8.1.1972 north-east coast, from encrusting fauna of stone 78 9.1.1972 25 from buoy cable 83 9.1.1972 south-east coast, from encrusting fauna of stones 94 13.1.1972 60-100 north-east coast, from bryozoans encrusting antipatharian trunk 96 13.1.1972 80-100 north-east and south coasts, washed from variety of coralligenous organisms 100 14.1.1972 0-5 north-east coast, on Macrocystis fronds 101 14.1.1972 80-100 east coast, from epifauna of antipatharian 103 15.1.1972 80-100 north-east coast, from epifauna of anti- patharian 111 16.1.1972 80-100 north-east coast, from encrusting fauna of stones 119 20.1.1972 80 north-east coast, from epifauna of bryozoan 132 22.1.1972 80-100 east coast, from epifauna of gorgonacian Acanthogorgia 133 23.1.1972 80-100 north coast, from sponges and corals 142a 25.1.1972 50 south-west coast, from epifauna of bryo- zoans and sponges 142b 25.1.1972 50 south-west coast, from epifauna of algae and sponges 143 25.1.1972 25-30 south-west coast, from amongst red algae and sponges 147 25.1.1972 60 west coast, from amongst algae, corals, and sponges 148 25.1.1972 80 west coast, from sponge on antipatharian base 173 12.2.1972 50-60 north-east coast, from epifauna of anti- patharian trunk Dl 6.12.1971 80-90 south-east of island D7 2.1.1972 60-80 east coast D12 23.2.1972 40-50 north coast D9 23.1.1972 50-60 east coast B9 17.12.1971 50 north-east coast In the following stations, the date of collection is also the station number: Date Depth (metres) Locality and ecological data 2.5.1969 27.3.197Oa 27.3.1970b 28.3.1970a sublittoral sublittoral sublittoral east coast, from amongst alga Pterocladia north coast, from crevices in rocks north coast, from crevices in rOcks north coast, from crevices in rocks and under stones north coast, from rocky wall and pools 12.12.1970 16.1.1971 17.1.1971 Depth (metres) 70 30 30 Locality and ecological on dead antipatharian trunk north-east coast, from Macrocystis holdfast east coast, from encrusting fauna of rock Isopods from the following stations were all taken from the stomach and digestive tracts of the fish Acantholatris monodactylus, all taken with a line, from 2 to 3 metres depth, in February- March 1971: PI, P2, P6, P7, P13a, P13b, PlI, P16, P17, P23, P26, P27, P28, P29, P30, P31, P33, P34, P36, P37, P38, P39, P42, P44, P46, P47, P48, P49, P50. Isopods from the following station were taken from the stomach contents of the rock lobster Jasus paulensis: 111. ST PAUL ISLAND Station No. Date 3 19.12.1971 6a 19.12.1971 6c 19.12.1971 7a 20.12.1971 7b 20.12.1971 8a 20.12.1971 8b 20.12.1971 8c 20.12.1971 14 21.12.1971 15 21.12.1971 16 21.12.1971 18 21.12.1971 19 21.12.1971 20 21.12.1971 22a 22.12.1971 22b 22.12.1971 22c 22.12.1971 23 22.12.1971 23a 22.12.1971 24a 22.12.1971 24b 22.12.1971 26 23.12.1971 27 23.12.1971 28 23.12.1971 30a 23.12.1971 30b 23.12.1971 32 23.12.1971 35 26.12.1971 Depth (metres) 2-3 sublittoral sublittoral sublittoral sublittoral mid- to sublittoral upper sublittoral littoral sublittoral sublittoral upper sublittoral upper sublittoral littoral littoral littoral 0,6 0,6 0,6 3,0 Locality and ecological data north edge of crater, from amongst sponges, bryozoans, and ascidians growing on sub- merged gill net inside crater, amongst algae inside crater, amongst Ulva inside crater, amongst algae inside crater, from under stones inside crater, amongst stones and algae inside crater, from black sediment between stones and algae inside crater, amongst organic debris and green algae exterior of north jetty, amongst red algae exterior of north jetty, from amongst Splachnidium rugosum exterior of north jetty, on rocks inside crater, aInQ,figSt encrusting algae, sponges, and ascidians from rock scrapings from rock scrapings inside crater, amongst encrusting corals, bryozoa, and worm tubes on boulders inside crater, amongst encrusting algae on boulders inside crater, amongst encrusting ascidians, sponges and bryozoans amongst encrusting algae, sponges and bryozoans amongst encrusting algae, sponges, and ascidians from Laminaria holdfast from Laminaria holdfast exterior of crater, east coast exterior of crater, east coast amongst algae exterior of crater, east coast inside crater, from Laminaria holdfast inside crater, from Laminaria holdfast inside crater, from Macrocystis fronds inside crater, amongst sponges, ascidians and algae Station No. Date 59 28.1.1972 67 30.1.1972 77a 2.2.1972 77b 2.2.1972 82 4.2.1972 85 4.2.1972 90 15.2.1972 91 15.2.1972 B7 24.12.1971 B19 27.1.1972 D3 30.1.1972 D5a 30.1.1972 D5b 30.1.1972 D5c 30.1.1972 D6 16.2.1972 D8 16.2.1972 Locality and ecological data from stomach contents of fish Thyrsites atun south-east coast, amongst encrusting algae, bryozoans and ascidians from Macrocystis holdfast from Macrocystis holdfast on operculum of fish, Lotris lineata north-east coast, from encrusting sponges, worm tubes, and corals inside crater, from encrusting sponges, bryo- zoans, ascidians, etc. inside crater, from encrusting worm tubes, and green algae inside crater, from encrusting bryozoans, worm tubes and algae on stones exterior of crater, amongst red algae and bryozoans north-east coast, from coarse sandy bottom east coast, from Laminaria holdfast east coast, from Laminaria holdfast east coast, from red algae north-east coast, from red algae, and bryozoans north-east coast, from coarse sediment 45 30 50-80 3-4 3-4 3-4 40-50 In the following stations the date of collections is also the station number: Date Depth (metres) Locality and ecological data 1970 29.12.1970 1.1.1971 3.1.1971 29.1.1971 exterior of crater, from Macrocystis exterior of crater, amongst sponges, ascidians and hydroids on floating buoy interior of crater, found in fishing boat exterior of crater, from submerged cable Family Tanaidae Anatanais gracilis (Heller) Tanais gracilis Heller, 1865: 133, pI. 12 (fig. 3). VanhOffen, 1914: 468, fig. 6a-g. Barnard, 1925a: 381; 1940: 489. Previous records Liideritzbucht to Durban, St Paul and Amsterdam Islands, Ceylon. AMS a4 1 b3 1 11 1 74 1 142b 1 6c 1 7a 2 7b 1 lovig.~+1 1 ovig. ~ + 1 18 2 20 3 22b 1 ovig. ~ 77a 2 90 3 93 2 8a D5jc Leptochelia barnardi Brown Leptochelia barnardi Brown, 1957: 406, figs 4a-e, 5a. Previous records False Bay, Table Bay. Leptochelia savignyi (Kroyer) Leptochelia savignyi: Brown, 1957: 404, fig. 5b (synonymy). Previous records Liideritzbucht to Mo~ambique, north and south Atlantic, Mediterranean, Indo-Pacific. St Paul B7 1 7b 1 D5jc 1 19 1 90 2 Order ISOPODA Suborder VALVIFERA Family Idoteidae Idotea metallica Bosc Idotea metallica: Barnard, 1914: 203; 1940: 507. Schultz, 1969: 78, fig. 97. Previous records Wide-ranging, almost cosmopolitan: Cape, Mo~ambique, Natal, Tristan da Cunha, Greenland, Nova Scotia, Straits of Magellan. Genus Paridotea Stebbing Heller (1861, 1865) and Brocchi (1877) in their lists ofisopods from St Paul and Amsterdam Islands both include Idotea nitida. Hale (1924), Andre (1932), and Sheppard (1957) place 1. nitida in the synonymy of Paridotea ungulata (Pallas). Examination of the idoteids from St Paul and Amsterdam Islands in the present collection, however, revealed two abundant species of Paridotea, neither being P. ungulata. Examination of Heller's type material, and com- parison with P. ungulata from the Cape, make it clear that P. nitida is a valid species. Paridotea nitida (Heller) Fig. 2B, D, F ldotaea nitida Heller, 1861: 497. Idatea nitida Heller, 1865: 131, pI. 12 (fig. 1). Brocchi, 1877: 97. Previous records St Paul Island. Material AMS 2.5.69 1 d' 5n St Paul DS/b 1 ~ a4 2 d'd' 2 ~~ D5/c 3 d'd' 4 ~'? a5 2 ~~ 6c 2 d'd' 1 ovig. ~ a6 16 d'd' 24 ~~ 17 juv. 7a 2 d'd' a7 2 d'd' 14 26 d'd' 21 ~~ a8 Id' 1 ~ 19 2 d'd' 2 ovig. ~~ Cl 12 d'd' 18 ~~ 20 1 ~ 1 ovig. ~ C2 Id' 1 ~ 28 6 d'd' 2 '?~ C3 3 d'd' 3 ~'? 59 Id' 16 3 d'd' 3 10 d'd' 13 ~'? 5juv. 143 2juv. P16 1 ~ P13 Id' P29 1 d' 1 ~ P30 2 d'd' 2 ~~ P34 4 d'd' 3 ~'? P37 1 ~ P38 8 d'd' 11 ~~ 1 ovig. ~ P42 1 ~ P46 1 d' P49 1 d' 5 ~~ P50 2 ~~ Remarks P. nitida can be separated from P. ungulata, with which it was for many years confused, by the structure of the pleotelsonic apex (distal corners rounded, separated by shallow concave distal margin in P. nitida, distal corners acute and spinose, with more concave distal margin in P. ungulata), the uropodal ramus (distinctly broader than long in P. nitida, as long as wide in P. ungulata), and the shape of the coxal plates of the last four pereional segments. (See fig. 2A, C, E.) Fig. 2. Paridotea ungulata (Pallas). A-Four posterior coxal plates; C-Uropodal ramus; E-Pleotelsomcapex. Paridotea nitida (Heller). B-Four posterior coxal plates; D-Uropoda.! ramus; F-Pleotelsonic apex. Separation of P. nitida from P. apposita Barnard, 1965, recorded from Gough Island, however, is more difficult. The pleotelsonic structure is identical in these two species, the uropodal ramus very similar (possibly not as wide in P. apposita as in P. nitida), while the seventh pereional coxal plate is perhaps more acute and produced in P. apposita. These differences, however, are very subtle, and more material from Gough Island may well prove the species to be synonymous, the subtle differences being a reflection of the isolation of the population. Paridotea reticulata Barnard Paridotea reticulata Barnard, 1914: 424, pI. 36D; 1940: 507; 1955: 6. Previous records Ltideritzbucht, Port Nolloth, Lamberts Bay, Table Bay, False Bay. Material AMS 23 79 100 1 d' 8 d'd' 15 5f5f 3 juv. 4 d'd' 5 5f5f 1 ovig. 5f 7 juv. Remarks The notch found on the sternum of the seventh pereional segment in South African specimens is not present in specimens from the St Paul and Amsterdam Islands. The spines of the disto-Iateral corner of the pleotelson are sometimes absent, possibly worn away. Suborder ANTHURIDEA Family Anthuridae Eisothistos crateris sp. novo Fig.3A-G Description Male: (head and mouthparts damaged). Head with anterior margin between eyes evenly convex, about half length of pereional segment I, with poorly defined median ridge. Pereional segments I-III subequal, each with anterior 'shoulder' and medio-dorsal ridge not quite reaching anterior margin. Pereional segments IV-VII posteriorly expanded, rounded, also with medio- dorsal ridge. Segment VII somewhat shorter than preceding segments. Dorso- lateral keels obvious on anterior three segments only. Anterior three pleonal segments wider than long, laterally rounded, 4th and 5th segments not distinct, possibly fused, much shorter and narrower than preceding segments. Eyes well developed, ocelli large, distinct. Antennular peduncle consisting of three stout segments, distal segment bearing pad of elongate setae; flagellum 6-segmented. Antennal peduncle consisting of two short proximal segments plus two slenoer elongate segments; flagellum 6-segmented. Pereiopod I dactylus with well-developedunguis; propodus two and a half times longer than wide, ventral margin bearing single distal spine plus 10 small serrate spines; carpus short, triangular. Following pereiopods essentially similar to pereiopod I, but with carpi slightly longer, not underriding the propodi. Pleopod 2 with elongate rami, exopod carrying six slender setae, endopod with four setae and sabre-shaped stylet on inner margin reaching well beyond apex of ramus, apically acute. Uropods and telson indurated. Uropodal exopod tripartite, consisting of inner rounded basal process armed with three to four small spines, median spike-like elongate portion and outer spine-like process; endopod just reaching apex of telson, apically acute, margins dentate. Telson evenly rounded, distally wider than proximally, latero-distal margins serrate; strong flattened medio-dorsal keel present, bearing three or four small spines distally. Fig. 3. Eisothistos crateris sp. novo A-Holotype in dorsal view; B-Telson and uropod; C-Antennule; D-Antenna; E-Pereiopod I; F-Pereiopod VII; G-Pleopod 2. Material Holotype: St Paul 90 1 .1. Paris Museum Is. 1001 Remarks Of the three species of Eisothistos described, E. vermiformis Haswell and E. atlanticus Vanhoffen are easily separated from the present species, either by general body shape, or on the nature of the telson. There is a marked resem- blance to E. antarcticus Vanhoffen 1914. The telson of the Antarctic species differs from the present species in having the medio-dorsal ridge armed with numerous spines (instead of four obscure spines), and in the outer process of the uropodal exopod, which is blunt and dentate (rather than spiniform). These differences could perhaps be due to variation within the same species. Another obvious difference is in the pleonal structure. The present specimen has the anterior three pleonal segments large and laterally rounded and the posterior segments obscure, while in E. antarcticus the anterior five pleonal segments are subequal. The species is named crateris as it was collected from the crater of 8t Paul Island which is open to the sea. Panathura amstelodami sp. novo Figs 4A-H, 5A-F Description Male: Anterior margin of head with median point; eye spots lateral. Pereional segment I twice length of head, segment II slightly shorter than I, segments III-VI subequal, VIIth somewhat shorter. Pleonal segments distinct. Antennule with 5-segmented peduncle, two basal segments as broad as long, 3rd and 4th segments subequal, wider than long, 5th segment more elongate, flagellum 4-segmented. Antenna with 3-segmented peduncle, 3-segmented flagellum. Mandibular palp 3-segmented, 1st and 3rd segments subequal, each about half length of middle segment; third segment bearing row of 7 spines, proximal 4 spines short; incisor portion of mandible consisting of three strong teeth plus thin plate with dentate margin. Maxilla slender, bearing 6 spines. Maxillipedal palp 4 or 5-segmented, 3rd segment largest, endite extending on inner margin to distal level of 3rd palp segment, distally tapered. Pereiopod I propodus with strong proximal triangular tooth forming a 'thumb', palm with two smaller proximal and one distal tooth; unguis of dactylus large and well-defined. Pereiopod II more slender and longer than I, palm with strong proximal 'thumb' and small tooth at base, larger distal tooth; carpus with two spines on ventral margin. Pereiopods III-VII similar, propodus twice length of carpus, both segments bearing ventral fringed spines; carpus hardly underriding propodus. H Fig. 4. Panathura amstelodami sp. novo A-Holotype in dorsal view; B-Antenna; C-Antennule; D-Uropodal exopod; E-Uropodal basis and endopod; F-Mandible; G-Maxilla; H-MaxiIliped. Fig. 5. Panathura amstelodami sp. novo A-Pereiopod I; B-Pereiopod II; C-Telson; D-Pereiopod VII; E-Pleopod 1; F - Pleopod2. Pleopod 1 exopod broad, operculiform, fringed with 13-14 plumose setae; endopod less than half length of exopod, very narrow, triangular, with single terminal plumose seta. Pleopod 2 exopod and endopod equal in length, former distally truncate, latter distally rounded. Uropodal exopod leaf-shaped, bearing numerous marginal setae, outer margin with four to five serrations in hyaline border; endopod with distal segment longer than proximal, with hyaline border non-serrate. Telson widest in distal half, with broad hyaline border, latter finely dentate distally, apical region bearing numerous simple setae. Material Holotype AMS a4 1 3 total length 5,0 mm Paris Museum Is. 1002 Paratypes AMS 119 3 ~~ 3,0 mm 3,2 mm 4,4 mm SAM-A14994 Paratypes AMS 142b 2 ~~ 3,2 mm 3,8 mm Paris Museum Is. 1003 Remarks Barnard (1925b) definesPanathura as similar to Apanthura, but possessing a 6-segmented maxilliped and with the palm of pereiopod I straight. The distinctive maxilliped, together with the distinct pleonal segments, operculiform 1st pleopods, and the 5th segment of pereiopods IV-VII underriding the 6th segment, complete the generic definition. The present material agrees with all these features, with the possible exception of the pereiopodal carpi, which only just underride the propodi. The present species differs from P. serricauda, with which it was collected, on several counts. The telson and uropods in Barnard's species are indurated and obviously serrated, and the uropodal exopod is a broad structure. In P. amstelodami the telson and uropods are not indurated, and possess a thin hyaline border, the exopod is a leaf-shaped structure, and although slightly serrate on the outer margin does not approach the almost dentate condition in P. serricauda. Further differencesmay be seen in the pereiopodal structure, as well as in the 1st pleopod with its reduced endopod. P. formosa Menzies & Frankenberg (1966), recorded from deep water off Georgia, U.S.A. possesses a very distinctive pleotelsonic structure, while the endite is not as developed as in the present species. Panathura serricauda (Barnard) Fig.6A-D Apanthura serricauda Barnard, 1920: 339, pI. 15 (figs 11-12). Panathura serricauda: Barnard, 1940: 490, 497; 1955: 5. Previous records Liideritzbucht, Saldanha Bay, Table Bay, False Bay. ISOPODAN AND TANAIDACEAN CRUSTACEA FROM SOUTHERN INDIAN OCEAN 281 Fig. 6. Panathura serricauda (Barnard). A-Animal in dorsal view; B- Maxilliped; C-four distal segments of pereiopod I; D-Telson. Material AMS a4 7 ovig. ~~ + 20 specimens a5 1 specimen a6 1 specimen Family Cirolanidae Cirolana rugicauda Heller Ciro/ana rugicauda Heller, 1861: 497; 1865: 142, pI. 12 (fig. 13). Bracehi, 1877: 99. Hansen, 1890: 358. Vanhoffen, 1914: 503, fig. 40. Barnard, 1940: 397, fig. 8. St Paul Island, Port Nolloth, St Helena Bay. Material AMS a1 a2 a3 a4as a6 a7 a8 a9 a10 b3 C1 C3 P46 6b 8 10 24a 2.5.1969 27.3. 1970/b St Paul 1 JUY. 6c 2 ~~ 3 ~~ 7 JUY. 1 JUY. 7a 1 ~ 3 ~~ 5 JUY. 1 JUY. 7b 9 ~~ 10 ~~ 6juy. 19 ~~ 33 ~~ sey. JUY. 8a 10 ~~ 20 ~~ 1 oyig. ~ sey. JUY. 6n 8b 2 ~~ 4 ~~ 6juy. sey. JUY. 8e 7 JUY. 3 ~~ 5juy. 14 1 ~ 1 JUY. 4M 4 ~~ 22a 1 JUY. 2juy. 24b 1 ~ 6n sey. juv. 1 ~ 8 ~~ 30a 3 ~~ 8 ~~ sey. JUY. 1 JUY. 30b 4 ~~ 8juy. 1 ~ 2 ~~ 2juy. 90 17 ~~ 10 ~~ 1~ 3 JUY. 93 4 ~~ Un 4juy. 1 ~ 1 ~ 4n 2juy. 1 ~ 1 oyig. ~ sey. JUY. 1 ~ 2 ~~ 1 ~ sey. JUY. 1 ~ 3 ~d' 6 ~~ Family Sphaeromatidae Cymodocella sapmeri sp. nov. Figs 7A-G, 8A-E, 9A-E Description Body two and one third times longer than wide, widest at VIIth pereional segment; head and pereional segments I-VI smooth; posterior margin of VIIth segment slightly nodose; pleon segment 1 usually concealed by pereion; last pleonal segment bearing irregular row of ten to twelve small conical tubercles. Pleotelson very convex, bearing numerous tubercles, some rounded, most conical. Apex of pleotelson forming dorsally flexed tube, the opening of which has tiny spike or papilla protruding into it. Coxal plates of pereional segments bearing pile of short hairs. Epistome A-shaped, with slender rami. Antennules shorter than antennae, with 3-segmented peduncle longer than flagellum. Antennal peduncle 5-segmented, distal segment longest; flagellum of about twenty-two segments, longer than peduncle. Mandibular palp 3-segmented, terminal segment with thirteen pectinate setae, middle segment with eight pectinate setae; incisor process of four teeth, lacinia mobilis of three teeth; setal row of eight penicilis; molar process broad, with dentate margin. Inner ramus of first maxilla bearing four elongate fringe setae, plus shorter simple seta; outer ramus tipped with eight dentate spines, degree of dentition varying from fairly smooth to many large denticles. Fig. 7. Cymodocella sapmeri sp. novo A-Holotype in dorsal view; B-Pleotelson in lateral view; C-Left mandible; D-Second maxilla; E-First maxilla; F-Maxilliped; G-Epistome. \If Fig. 8. Cymodocella sapmeri sp. novo A-Antenna; B-Antennule; C-Pereiopod I; D-Pereiopod VII; E-Penes. Second maxilla, inner ramus with about ten fringed spines, both lobes of outer ramus tipped with four or five pectinate curved spines. Maxillipedal palp 5-segmented, second segment longest; segments two, three and four somewhat lobed, lobes bearing clumps of simple setae; endite bearing about ten fringed spines, and single coupling hook. Pereiopod I willi propodus, carpus, merus, and distal part of ischium bearing pile of fine short setules; propodus bearing five fringed spines; carpus very short; dactylus tipped with distal curved spine with shorter blunt spine at its base. :Pereiopods increasing slightly in length posteriorly. Pereiopod VII with carpus bearing six fringed spines; ischium with two strong spines on dorsal margin. Fig. 9. Cymodocella sapmeri sp. novo A-Pleopod 1; B-Pleopod 2; C-Pleopod 3; D-Pleopod 4; E-Pleopod 5. Rami of penis moderately elongate, tapering slightly. Pleopod 1 exopod broadly oval, longer than triangular endopod. Pleopod 2 exopod oval, much smaller and shorter than triangular endopod; latter with stylet on median margin, stylet slightly longer than endopod, distally dilated, apically narrowly rounded. Pleopod 3 with oval exopod shorter than triangular endopod. Pleopods 4 and 5 with both rami membranous, pleated. Both rami of uropod elongate-oval, of equal length, distally rounded, margins slightly serrulate. Pleotelson of female less obviously tuberculate than that of male. Material Holotype Allotype Paratypes Paratypes AMS C3 1 6 Paris Museum Is. 1004 AMS C2 1 ovig. Paris Museum Is. 1005 St Paul D5jc 13 66 9 6 ovig. Paris Museum Is. 1006 AMS Cl 566 12 14ovig. SAM-A14995 AMS St Paul a2 5 1 juv. Dj5a 3 1 ovig. 2 juv. a3 1 1 juv. D5jb 1 ovig. a4 3 14 466 IOn 5 juv. a5 1 6 1 16 1 6 1 a6 3 1 ovig. 2 juv. 19 2 ovig. bl 1 20 1 6 1 1 ovig. b2j2 6 6 juv. 22b 16 C2 566 710 ovig. 17 juv. 28 7 1 ovig. 11 juv. C3 466 1 30vig. 7 juv. 90 666 16 n 3 ovig. P29 1 ovig. P30 3 P33 1 ovig. P34 1 ovig. P36 2 3 16 6b 266 2 juv. 24a 266 2 1 ovig. 147 2 juv. 28.3.1970jb 1 6 1 Remarks Of the eleven species of Cymodocella described, the present species only resembles C. nipponica Nishimura, from Japan, to a limited degree. That Japanese species possesses numerous rounded tubercles on the pleotelson, while the present species possesses more numerous conical tubercles. Apart from this tenuous similarity, C. sapmeri is quite distinct from all other described species. This species is named for S.A.P.M.E.R., the lobster-fishing company operating around the St Paul and Amsterdam Islands (see introduction), and for the ship used by the Company. ISOPODAN AND TANAIDACEAN CRUSTACEA FROM SOUTHERN INDIAN OCEAN 287 Dynamenella brunnea Vanhoffen Fig.lOA-B Dynamenel/a brunnea Vanhoffen, 1914: 516, fig. 49. non Dynamenel/a huttoni: Barnard, "' 1940: 419. Previous records 8t Paul Island. Material AMS al 1 ~ St Paul D5/a 2,M 2 ~~ 1 juv. a3 2 ~~ D5/c 11 ~~ sev.juv. a4 2JJ 3 ~~ 7b 1 J a5 2juv. 8a 2juv. a6 11 ~~ sev.juv. 14 1 J sev.juv. a7 5 JJ 20 1 ~ 5 juv. a8 2 JJ 26 1 ~ al0 5 JJ 2 ~~ 28 3 ~~ bl 1 ~ b2/2 2 ~~ cl 1 J 14 ~~ sev.juv. c2 7 ~~ c3 2 ~~ PI 1 ~ P2 sev.juv. P4 1 juv. t P6 3 juv.P7 2juv. P13b 1 ~ t P16 IJ sev.juv.P23 2juv. P26 sev.juv. P27 4juv. P28 1 juv. P29 sev.juv. P31 1 juv. P30 3 JJ 2n sev.juv. P36? sev.juv. P34 sev.juv. P38 1 J 4n sev.juv. P44 1 juv. P45 1 juv. P48 2 juv. P49 sev.juv. P50 3 JJ 6 ~~ sev.juv. P83 7 juv. 3 3 JJ 6n sev.juv. 8 58 JJ 28 ~~ 12 9 JJ 1 ~ 16 1 ~ 10 juv. 24a 1 ~ 2.5.1969 IJ 6n t 1.3.1970 1 J 3n 27.3.1970/b 3 JJ 28.3.1970/b 4 JJ 9 ~~ Fig. 10. Dynamenella brunnea Vanhoffen. A-Pleotelson; B-Epistome; C-Epistome of D. huttoni. Remarks Examination of Vanhoffen's type material in both the Berlin Museum and the British Museum, together with the very large number of specimens in the present collection, shows that this is indeed a valid species. Separation from D. huttoni which resembles (and with which Barnard synonymized it) is best done by reference to three features: pleotelsonic structure, epistome and head structure, and colour pattern. The dorsal surface of the pleotelson in D. brunnea always has some indication of tuberculation. In juveniles of less than 2 mm length, the two main submedian tubercles can already be seen, while in larger specimens these two large tubercles are supplemented by several smaller tuber- cles. D. huttoni by contrast invariably possesses a smooth pleotelson. The median ventrally-directed lobe of the sinuous frontal margin of the head in D. brunnea is relatively narrower than in D. huttoni; a subtle difference in the shape of the epistomes is also constant. The colour pattern, though variable in both species, is more constant in D. brunnea, where a rhomboidal pale patch is frequently seen mid-dorsally on pereional segments II to IV. While D. huttoni often has pale dorsal patches, these almost never are as regular as in the former species. Dynamenella dioxus Barnard Dynamenella dioxus Barnard, 1914: 419; 1940: 418, 505. Day, Field & Penrith, 1970: 48. Previous records Liideritzbucht, Port Nolloth, Lamberts Bay, Table Bay, False Bay. Material AMS a4 74 142a 142b 147 ISOPODAN AND TANAIDACEAN CRUSTACEA FROM SOUTHERN INDIAN OCEAN 289 Parisocladus perforatus CR. M. Edwards) Sphaeromaper/orata Edwards, 1840: 211. Heller, 1861: 496; 1865: 139, pI. 12 (fig. 9). Spheromaper/orata: Brocchi, 1877: 97. Dynamenella per/orata: Hansen, 1905: 117, 126. Cycloidura per/orata: Stebbing, 1910: 431. VanhOffen, 1914: 511, figs 45-46. Parisocladus per/oratus: Barnard, 1914: 402, pI. 32H; 1940: 418, 505. Penrith & Kensley, 1970a: 228; 1970b: 259. Day, Field & Penrith, 1970: 48. Previous records Rocky Point (S.W.A.), Mowe Bay (S.W.A.), Swakopmund, Liideritzbucht, Port Nolloth, Lamberts Bay, Dyers Island, Table Bay, False Bay, Port Alfred, East London, St Paul Island, Amsterdam Island. Material AMS al sev. juv. St Paul D5/a 1 0' 36 ~~a3 6 0'0' 8 ~~ sev. juv. D5/b 1 juv. a4 4 0'0' 6 ~~ sev.juv. D5/c 5 0'0' 8 ~~ 1 juv.a5 3n 6a 1 juv. a7 2n 6c 120'0' sev.juv. a9 1 0' 1 ~ 7a 13 0'0' 3 ~~ sev.juv. b2/1a 1 ~ 8a 20'0' 4juv. b2/1b 4n sev. juv. 8b 1 0' b2/2 3 0'0' 3 ~~ sev.juv. 14 6 0'0' sev.juv. b3 1 0' 2 juv. 15 2 0'0' sev.juv.C2 3 0'0' 1 ~ 16 7 0'0' sev.juv.C3 2 juv. 18 10' 3n 3 juv.111 1 juv. 19 3 0'0' sev.juv.P2 1 0' 20 sev.juv. P11 4 0'0' 7 ~~ 22a 1 ~ 2juv.P13a 3 0'0' 3n 22b 2juv. P13b 2 0'0' 4 ~~ sev.juv. 22c 1 ~ 1 juv.P17 6 juv. 23a sev.juv. P26 6juv. 26 10' 4 ~~P28 1 juv. 23 13 0'0' 10 ~~P29 6juv. 27 1 0' 4juv. P30 6 juv. 28 3 0'0' sev. juv. i P33 sev.juv. 30b 3 0'0' 1 ~ I, P34 sev. juv. 30g 13 0'0' 9n 1 P36 sev.juv. 35 3nI P39 1 juv. 76 8 ~~ 9 juv. 1 P44 7 juv. 77a 2 ~~P45 1 juv. 90 6 ~~P46 2 0'0' 3 juv. 91 3 0'0' sev.juv.P47 3 juv. I P50 1 0' 3 2 0'0' sev.juv. 5a 2 0'0' 4 ~~ sev.juv. 6b 2 0'0' 3 ~~ 8 16 0'0' 5n 2 juv. 9 2 ~~ 12 3 0'0' 14 13 0'0' 37 ~~ sev.juv. 24a 17 0'0' 6 ~~ sev.juv.2.5.1969 1 0' 27.3.1970/b 240'0' 21 ~~ 3 juv. 28.3.1970/b 2 0'0' 5 ~~ 4juv. Family Limnoriidae Limnoria (Limnoria) quadripunctata Holthuis Limnoria quadripunctata Holthuis, 1949: 167. Menzies & Mohr, 1952: 81. Menzies, 1957: 127. Schultz, 1969: 143. Previous records North Sea coast of Holland, California coast, Valparaiso (Chile). Material AMS a4 5a 5b 16.1.1971 13 JUY. 4juy. 6 JUY. St Paul B19 1 ~ 77a 6 ~~ 1970 3 eM 9 n 9 oyig. 'i1'i1 4 oyig. 'i1'i1 Remarks These specimens were all found in the holdfasts of the giant brown algae Macrocystis pyrifera and Laminaria paUida from the upper infralittoral zone, with the exception of station B19 on St Paul Island, where the isopods were found in clusters of red algae from a depth of 30 metres. Family Cymothoidae Lironeca raynaudii (H. M. Edwards) Livoneca raynaudii: Barnard, 1920: 358; 1940: 501; 1955: 6. Previous records Table Bay, Durban, New Zealand, Tasmania, New South Wales, Japan. Material St Paul 82 1 ~ 3.1.1971 1 'i1 Family Aegidae Aega 'antillensis' Schiodte & Meinert Aega antillensis: Richardson, 1905: 170. Barnard, 1925a: 389. Schultz, 1969: 190. Previous records Natal, West Indies, Japan. Material St Paul 3.1.1971 3.1.1971 from fishing-boat on Thyrsites atun Remarks Slight differences in the frontal laminae, telson, etc., suggest that A. antil- lensis s.s., and specimens from South Africa, and others from St Paul Island are not all the same species, although all keyed out to this species. Aega monilis Barnard Aega monilis Barnard, 1914: 365, pI. 31C; 1940: 500. previous records Table Bay, off Cape Peninsula, off East London. Remarks It seems probable from the brief description provided by Brocchi (1877: 100) of Rocinela major, from St Paul Island, that this was a specimen of Aega monilis. Examination of Brocchi's type, however, is necessary to establish the identity of R. major Suborder ASELLOTA Family Stenetriidae Stenetrium crassimanus Barnan:l Stenetrium crassimanus Barnard, 1914: 217; 1940: 510. Wolff, 1962: 23. Previous records False Bay (Cape), Natal. St Paul 18 1 t1 91 2 t1~ Stenetrium saldanha Barnard Fig. lIA-F Stenetrium saldanha Barnard, 1920: 403. Wolff, 1962: 24, 29. Previous records Saldanha Bay, False Bay, Still Bay. Material AMS D1 1 t1 142b 1 t1 St Paul 18 91 Remarks Wolff's key (1962: 22), taken from Barnard's description of S. saldanha, places this species in the group which lacks any process at the antero-Iateral corner of the first antennal peduncle segment. This segment, however is produced into a triangular process which is sometimes difficult to see. Family Antiasidae Antias dimorphus Menzies Antias dimorphus Menzies, 1962: 63, fig. 16. Fig. 11. Stenetrium saldanha Barnard . A-Pereiopod I; B-~ head in dorsal view; C-Pleotelson; D-Operculum~; E- Pleopod 1 CS; F - Pleopod 2 CS. Previous records Southern Chile, Kerguelen Island. Material AMS al 15 d'd' 16n 14 ovig. ~~ St Paul D3 1 d' a2 5 d'd' 2 ovlg. n 8a 42 d'd' 9n 24 ovig. ~~ a3 5 d'd' 4n 3 ovig. n 8b 3 d'd' 1 ovig. ~ C2 9 d'd' 2n 5 ovig. ~~ 8c 16 d'd' 16 ~~ 5 ovig. ~~ C3 2 d'd' 1 ~ 3 ovig. ~~ 14 1 d' 2 ovig. ~~ 6b 1 d' 90 2 ovig. ~~ 93 26 d'd' 9n 10 ovig. ~~ Remarks Amongst Vanhoffen's material of Antias marmoratus collected by the Slidpolar Expedition at Kerguelen Island (Berlin Museum 17699) are four specimens of Antias dimorphus showing the enlarged first pereional segment. The remaining specimens of A. 'marmoratus' from Kerguelen at St Paul Island collected by the Slidpolar Expedition are probably A. hofsteni Nordenstam. As Vanhoffen's material is a mixture of two species, each from a different location, the name A. marmoratus will be omitted from the faunal list of the two islands, but remains on the list of species for Kerguelen Island. Antias hispidus Vanhoffen Fig. 12A-B Antias hispidus Vanhoffen, 1914: 533, fig. 60. Stephensen, 1927: 356, fig. 24. Nordenstam, 1933: 201, fig. 47. Menzies & Miller, 1955: 385. Previous records St Paul Island, Auckland Island, Falkland Island, Graham region (Antarctica). Fig. 12. Antias hispidus Vanhoffen. A - Pleopod 2 d'; B - Pleopod 1 d'. Material AMS a6 1 d' 1 ~ St Paul 8a 7 d'd' 7 ~~ 6 ovig. ~~a4 6 eM 1 ~ 3 ovig. ~~ 8b 1 ovig. ~b3 2 d'd' 1 ~ 14 Id'D12 1 ~ 16 2 ~~ 1 ovig. ~173 Id' 77a Id' 93 3 d'd' 2 ~~ 4 ovig. ~~ Antias hofsteni Nordenstam Fig. 13 Previous records South Georgia. Material AMS 17.1.1971 D19 119 142b 1 ovig. ~ 1 ovig. ~ 1 ovig. ~ St Paul 29.1.1971 B7 Fig. 13. Antias ho/steni Nordenstam. Uropod. Remarks In the general body structure and proportions, and in the appendages, the present material agrees completely with Nordenstam's description. The uropod, which was lacking in all the Antarctic material previously collected, is figured. Family Janiridae Caecianiropsis ectiformis (VanhOffen) Fig. 14A-C Austroniscus ecti/ormis Vanhoffen, 1914: 553, fig. 80. Caecianiropsis ecti/ormis: Menzies & Pettit, 1956: 446. Previous records Observatory Bay, Kerguelen Island. Remarks Vanhoffen's figure does not show the first pleonal segment. This segment, although difficult to see, is present in both the Kerguelen and St Paul specimens. Diagnosis Janirid possessing eyes, slight rostral point, scale on antennal peduncle. Pereional segments more or less equal in length and width. Coxal plates dorsally visible on all segments. Pleon longer than wide. Pereiopod I similar in male and female; propodus distally expanded, palm straight; dactylus biunguiculate. Pereiopods II-VII triunguiculate. Uropod with well-developed basis, exopod half length and width of endopod. Pleopod 1 in male narrow, Y-shaped, proximal halves of rami contiguous, distal halves divergent, narrow. Discussion In the structure of the antennae and mouthparts, the rostral projection, the prehensile first pereiopod, the triunguiculate dactyli of the remaining pereiopods, this species could be placed into the genus Janira, as Barnard (1920) did. The Y-shaped first pleopod of the male, however, which resembles no other janirid, demands the creation of a new genus. The type species of the genus is Ianiroides angusta (Barnard, 1920), and was originally described from a single male from False Bay, Cape. Some of the appendages of this specimen have been refigured. Fig. 14. Caecianiropsis ectiformis (VanhOffen). A-~ in dorsal view; B-Mandible; C-Maxilliped. Ianiroides angusta (Barnard) Figs 15A-F, 16A-D Janira angusta Barnard, 1920: 404, pI. 17 (figs 1-3); 1940: 511. Wolff, 1962: 41. Previous records False Bay, Cape I J. Material AMS 74 3 ~~ 1,5 rom 1,8 rom 2,0 rom Supplementary description Eyes with nine or ten ocelli. Coxal plates visible on all pereional segments, those on segments I-IV situated at antero-Iateral corners, those on segments V-VII on postero-Iateral corners; coxal plates of segments I and II distally acute, remaining plates rounded. Pereiopod I similar in male and female, with propodus distally broad, palm armed with five or six short blunt sensory setae; dactylus apically biunguiculate. Operculum in female broader than long, with distal margin slightly concave. Pleopod I in male narrow, rami proximally contiguous, distally divergent, apically tapered, tipped with several setae. Diagnosis Janirid possessing eyes, no distinct rostral point; scale on antennal peduncle; antennule well developed. Pereional segments more or less equal in length and width. Coxal plates dorsally visible on all segments. Maxillipedal palp 5-segmented, three proximal segments expanded. Pereiopods similar, ambulatory, dactyli all biunguiculate. Uropodal basis short, rami separate, exopod slightly shorter and narrower than endopod. First pleopod of male very broad, expanded, rami fused proximally. Pleotelson marginally serrate, bearing dorso-Iateral ridge. The type species of the genus is Ianisera trepidus sp. novo Remarks The presence of eyes, well-developed antennules, uropods, and molar process of the mandible, together with the enlarged segments of the maxilli- pedal palp, all the pereiopods being ambulatory, and the body parallel-sided, suggest the group of genera Jaera, Janira, Janilirata, Ianiropsis. The first pereio- pods of the male are not more elongate than the following pereiopods as in Ianiropsis, or prehensile as in Janira, neither are the uropods produced well beyond the body margin as in Janilirata, nor does the species possess indented lateral margins of the posterior pereional segments. This species is charac- terized by the broad first pleopod of the male, the pleotelson bearing a lateral ridge, and all the pereiopods armed with two dactylar spines. Fig. 15. Ianiroides angusta (Barnard). A-~ in dorsal view; B-Mandible; C-First maxilla; D-Secondmaxilla; E-Maxilliped; F - First pereiopod ~. Fig. 16. Ianiroides angusta (Barnard). A-Pereiopod VII; B-Pleopod 1 &'; C-Pleopod 2 &'; D-Operculum!;l. Ianisera trepidus sp. novo Figs 17A-G, 18A-D Description Male: Body elongate, parallel-sided, bearing numerous short setae. Head anteriorly trilobed, rostral process evenly rounded; eyes tiny, dorsal, situated in posterior half of head. Coxal plates visible on all pereional segments. Pleo- telson slightly longer than wide; lateral margins bearing about five serrations, posterior margin with broadly rounded median lobe; single lateral ridge on distal half, just median to lateral margin, ending distally in spine. Antennule about half length of antennae, consisting of large basal segment, second segment about half length and width of basal segment, flagellum of four segments. Antenna consisting of 5-segmented peduncle, second segment bearing well- developed scale; first and second segments equal in length to third segment, latter two-thirds length of fourth segment; flagellum of twelve segments. Mandible bearing 3-segmented palp, distal segment curved, armed with seven serrate spines, middle segment with four slender serrate spines; incisor process of five teeth, setal row of six serrate setae well separated from distally truncate molar process. First maxilla, inner ramus bearing two stout setae plus several very fine setae, outer ramus with at least twelve serrate spines. Second maxilla, outer ramus slender, bearing three elongate simple setae; outer lobe of inner ramus slender, bearing four elongate simple setae, inner ramus stout, carrying numerous simple setae. Maxillipedal palp 5-segmented, two distal segments slender, three proximal segments expanded; endite bearing several fringed setae distally, two coupling hooks medially. Pereiopods similar, basal segment longest, all dactyli tipped with two curved spines. Pleopod I broad, two basal sections together forming almost complete sphere, distal area between median line and outer spine broadly convex, carrying about twenty alternately long and short setae. Pleopod 2 bearing eight elongate simple setae distally. Uropods with base almost hidden by distal margin of pleotelson, outer ramus slightly longer and broader than inner, both carrying numerous setae. Female: Similar in all head and pereional appendages to male. Operculum carrying numerous close-set setae on distal margin, latter somewhat concave medially. Holotype Paratypes AMS 16.1.1971 1 ~ 2,0 mm Paris Museum Is. 1007 AMS 133 2 ~~ 1,1 mm 1,7 mm 2 ~~ 1,3 mm 1,9 mm Paris Museum Is. 1008 AMS 17.1.1971 1 ~ 1,8 mm 2 n 1,3 mm 1,8 mm SAM-14996 AMS 39 2 n 1,9 mm 2,Omm Fig. 17. Ianisera trepidus sp. novo A-Holotype in dorsal view; B-Antennule; C-Antenna; D-First maxilla; E-Second maxilla; F - Mandible; G - Pereiopod I. Fig. 18. Ianisera trepidus sp. novo A-Maxilliped; B-Pleopod 10'; C-Pleopod 2 0'; D-Operculum!? Fig. 19. Janira capensis Barnard. A-.;J in dorsal view; B-First maxilla; C-Second maxilla; D-Mandible; E-Maxilliped. Fig. 20. Janira capensis Barnard. A-Antenna; B-Pleopod 1 ~; C-Pleopod 2~; D-Pleopod 3 ~. Janira capensis Barnard Figs 19A-E, 20A-D Janira capensis Barnard, 1914: 220, pI. 20b. non Iathrippa /ongicauda Chilton, Menzies, 1962: 72. Previous records Uideritzbucht, Saldanha Bay, Table Bay, False Bay. Material AMS a7 St Paul 6c 2 ~~ 2 ~~24a 1~ 7a 3 ~~ 2 ~~ B7 3 ~~ 1 ~ 1 juv. 7b 12M 3 ovig. ~~ 4 ~~ 18 13 ~~ 2ovig. ~~ 11 ~~ 20 4 ~~ 3 ~~ 22a 5 ~~ 1 ovig. ~ 2 ~~ 22c 7 ~~ 7 ovig. ~~ iO ~~ 4juv. 23 5 ~~ 1 ovig. ~ 8 ~~ 8 juv. 30a 1 ~ 1 ~ 30b 2 ~~ 1 ~ 32 1 ~ 91 7 ~~ 2ovig. ~~ 3 ~~ Remarks Nordenstam (1933), in his description of 1. longicauda, figures the pleo- telsonic margins entire, the carpus of pereiopod I without a distal curved spine, and mentions the distinct rostrum for the species. Menzies (1962, fig. 51f-g) also shows a well-developed rostrum, which is lacking in the present material. Thus 1. longicauda is easily distinguishable from Barnard's valid species. Ianiropsis palpalis Barnard Fig. 21 laniropsis palpalis Barnard, 1914: 222, pI. 21A. Wolff, 1962: 251. Previous records Ltideritzbucht, Table Bay, False Bay, Port Elizabeth, East London. Material AMS St Paul A6 1 ~ B7 2 ~~ 2 ~~ 1 ovig. ~B9 1 ~ B19 9 ~~ 6 ~~bl 6 ~~ 3 ~~ 3 ovig. ~~ 03 4 ~~ 1 ~b3 20 ~~ 11 ~~ 7 ovig. ~~ 05/a 1 ~ 3 ~~ 1 ovig. ~01 2 ~~ 4 ~~ 05/c 3 ~~ 2 ~~ 4 ovig. n07 1 ~ 06 20 ~~ 4 ~~ 5 ovig. ~~09 10 ~~ iOn 11 ovig. ~~ 08 1~012 11 ~~ 8n 7 ovig. ~~ 011 1~J11 1 ~ 2 ~~ 3 40~~ 22 ~~ 15 ovig. nPI 4 o-~ 7a 10 o-~ 7 ~~ 11 ovig. ~~P4 10- 7b 8 ~o- 6 ~~ 7 ovig. ~~P19 1 0- 2 ~~ 1 ovig. ~ 14 2 ovig. ~~ P28 1 ~ 16 2 ~~ 1 ~ 1 ovig. ~P34 1 ~ 18 14 ~~ 3 ~~ 3 ovig. ~~P45 1 ovig. ~ 19 2~~ 1 ~ 1 ovig. ~P83 1~ 20 20M 9 ~~ 13 ovig. ~~27.3.1970/b 1 ~ 3 ~~ 22a 8 ~~ 2 ~~ 6 ovig. ~~ 28.3.1970/b 2 ~~ 2n 22b 6 ~~ 2n 3 ovig. n12.12.1970 2 ~~ 1 ~ 1 ovig. ~ 22c 12 ~~ 7 ~~ 1 ovig. ~17.1.1971 3 ~~ 1 ovig. ~ 23 5 ~~ 2 ~~ 3 ovig. ~~16.1.1971 4 ~~ 1 ~ 23a 1 0- 1 ~ 2 ovig. ~~4 1 ~ 24b 2 ovig. n 306 ANNALS OF THE SOUTH AFRICAN MUSEUM Material 9 1 ~ 30a 8 ~~ 5 ~~ 3 ovig. ~~11 1 ~ 1