MA^^Ke, /^7i A New Crab-shaped Anomuran Living Commensally with a Gigantic Sea-anemone [Neopetrolisthes ohshimai gen. et sp. nov) Sadayoshi MiYAKE Zoological Laboratory, Kyushu Imperial University, Fukuoka HS ^11 12 ^ 1 J! Reprinted from The Zoological Magazine Vol. 49, No. 1 January, 1937
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A New Crab-shaped Anomuran Living Commensally with a Gigantic Sea-anemone {Neopetrolisthes ohshimai gen. et sp. nov.)'^ Sadayoshi MiYAKE Zoological Lahonitorii, Kyushu Imperial Univfrsitji. hvkuoka Received Dec. 20, li»3tl In his narrative, '' A (rlimpse on. Animals of the Yaeijaviu-Groiqj, Riukiu ", - Professoi' Hiroshi OHSiii^rA has described a crab-shaped A-uomuran living commensally with a gigantic sea-anemone. So far as I am aware no rei^resentative of this group as commensal with other animals has ever been discovered in the Indo-Pacific region. The form ill question seems to be new to science and may constitute a new genus. I have much pleasure in dedicating this new species to Profesior OHSHIJIA. I wish to express my hearty thanks to Professors Hiroshi OHSHI^FA and Teiso ESAKI by whojii the valuable specimens were collected (on Tune 25, 1934, during tlieir expedition to Riukiu) and were placed at my dis^iosal. Neopetrolisthes gen. nov. Carapace.sabovate, longer than broad and strongly convex in both directions. Frontal lobe broad, much flattened, laminated and convex above. Supraocular spine wanting. Ej^e small. Epibranchial spine small and acute. First antenna] article ver}" sliort. Chelipeds subequal, strongly short and robust. Wrist very short, being about lialf the length of carapace. Palm broad and flattened. Ambulator}^ legs short and robust, teririinating in a single claw. Orthotype. Neopetrolisthes ohshimai sp. nov. The present genus is allied to Petrolistlies STIMPSOX, but it is easily distinguishable from tlie latter by the following characters: (1) the carapace is strongly convex and longer than in Petrolistlies, (2) the front is broad and laminated, (3) the median furrow and the short oblique ones cannot be 1) Contributions from the Zoological Laboratory, Kyushu Imperial University, No. 95. 2) Botany and Zoology. Tokyo. 1935, vol. 3, no. 1. p. 100.
S. MrvAiv'i:: A New Aiiomuran Living Coirnneiisally witli a Sea-anemone 35 seen, (4) the eye is rather small, (5) the chelij^eds are remarkably snjall, (6) tlie aml)ulatory legs are subcylindrical and are destitute of sjnnes a.nd.hairs. Neopetrolisthes ohshimai sp. nov. Type, llolotype (^) and allotype (ovigerous?) are de])ositfd in the.zoological Laboratory, Kyushu Imperial University. Fukuoka. Tj/pe-locaJitjj. Coral reef. Shika, Ishigaki-sliima, Vaeyaina-Cu'oup. Ixiukiu islands. Colour (in life\ Wlnte with I'eddish round markings on both (h)rsal and ventral surfaces. ^^easurelno^t^i (in mm ) Length of carapace Breadth of carapace^ Heiglit of carapace Lengtli of wn.t f Ff'ft ^ ^..^^^^ Length of chef / J.elt '^ I Right First pair of ainbnl.itory leus Length of nierus Length of carpns + propodus... reiiultimatc pair ('f ambulatory le^s Length of meru? Length of carpus -^ propodus... llolotype (, r? ) Allotype (.? ).. n.s 14.5!).")»").0 7.*> 7.4 14.0 14.r> i).0 7.5 < ).<) 7.4 12.5 S.5 7.S 7.0 14.0 14.5 ti.o V\.b <).-!).0 i\('opcfrolmh('>f ojishimal gen. et sp. nov. L Ilolotyre {$), '2. Allotyj^e {SI) Descripfioii of type. Carapace subovate, strongly convex in botli directions and much longer than broad. Upper surface of carapace sm(.)()th, polislied and marked with delicate transverse lines on both postero-lateral ])orti()ns. Uront broad and much projecting forward and downward. Median lol)e of front triangular, with a]^ex rather acute. Frontal lol)e remarka.l)ly llattened,
Ml S. MiYAKi:: A New Anoinuran ]/vii)g Cominensally with a Sea-anen.or.e laminated and convex above. Supraocular spine wanting. Postocular tootli tria,ngular. Eye very sma,ll, half of which can scarcely be seen from above. Epibranchia.1 tooth small and acute. Cervical groove distinct. Gastric region most elevated. Lateral margins strongly cristate anteriorly; carinae a])proaching middle of branchial regions. Chelij^eds subequal. right one being larger in both sexes. Arm has a blunt tooth at distal end of anterior margin; its distal margin of under surface armed with a small blunt tooth at about its middle. "Wrist remarkably short, onlv about half the length of carapace, namely, a little longer in o, shorter in?, than half the length of caraj)ace. Anterior y margin of wrist armed with three teeth in both sexes. First tooth at proximal end, second.a little distance before middle. First two teetli acute. j Third rudimentary and slightly projecting. I'alm and lingers much dejn-essed and broad. Posterior margin of wrist furnished with a linear submarginal crest. Posterior margin of palm prolonged at its distal end into a rather acute spine. Movable tinger shorter than palm. No gap betweei! fingers. Surface of chelipeds smooth. P^irst two pairs of ambulatory leg>, shorter than the two preceding pairs. Propodus has a spinule at its distal end on posterior margin. Dactylus of ambulatory legs short, terminating in a black horny claw and armed with one or two spinules on their posterior margins. Ambulatory legs smooth and subcylindrical.