Crabs (Crustacea, Decapoda) from the Sea off East and Southeast Asia collected by the RV Hakuhō Maru (KH- 72 - 1 Cruise) 1. Sulu Sea and Sibutu Passage Author Takeda, Masatsune Department of Zoology, National Museum of Nature and Science, 4 - 1 - 1 Amakubo, Tsukuba, Ibaraki 305 - 0005, Japan E-mail: takeda @ kahaku. go. jp (MT) / h-komatu @ kahaku. go. jp (HK) takeda@kahaku.go.jp Author Ohtsuchi, Naoya International Coastal Research Center, Atmosphere and Ocean Research Institute, The University of Tokyo, 1 - 19 - 8 Akahama, Otsuchi, Iwate 028 - 1102, Japan E-mail: ohtsuchi @ g. ecc. u-tokyo. ac. jp ohtsuchi@g.ecc.u-tokyo.ac.jp Author Komatsu, Hironori Department of Zoology, National Museum of Nature and Science, 4 - 1 - 1 Amakubo, Tsukuba, Ibaraki 305 - 0005, Japan E-mail: takeda @ kahaku. go. jp (MT) / h-komatu @ kahaku. go. jp (HK) takeda@kahaku.go.jp text Bulletin of the National Museum of Nature and Science. Series A, Zoology 2021 2021-05-21 47 2 65 97 journal article 10.50826/bnmnszool.47.2-65 2434-091X 12759907 09E0EFF3-ABE7-43D7-AA85-DA3BF08E47B9 Platymaia bartschi Rathbun, 1916 ( Fig. 13 ) Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 20 (Sibutu Passage; 05°40.9′N , 119°46.3′E – 05°43.1′N , 119°47.0′E ; 460–514 m deep); otter trawl; 10 June, 1972; 1 young ˁ ( CB 36.1 mm ; CL 34.9 mm excluding rostral spine, soft shell) , NSMT-Cr 28975. Remarks . In addition to the soft shell male recorded above, the right half of the carapace and left cheliped are in the same vial. Considering the size of the half carapace with 73.7 mm in CL and the shape of the slender cheliped, the specimen is fully developed female. Although the rostral tooth is unfortunately broken off, the specimen is safely identified as Platymaia bartschi . In the soft shell male ( Fig. 13 ), the rostral tooth is warped for its distal half, but it is clear that the main rostrum is slender and much longer than the lateral rostral teeth. Griffin (1976) distinguished Platymaia bartschi from P. wyvillethomsoni Miers, 1886 based mainly on the Philippine specimens; in P. bartschi the inter-antennular spine is almost three times as long as the rostral spines (about twice as long as in P. wyvillethomsoni ). Griffin (1976) and Griffin and Tranter (1986) also reported develop- mental variation, namely that in juveniles the carapace bears numerous spines including six lateral branchial spines, two on each protogastric, mesogastric, cardiac, epibranchial and mesobranchial regions. Guinot and Richer de Forges (1986) finely illustrated the front-orbital details and had little doubt about the occurrence of this species in Japan . Distribution . Philippines ( Rathbun, 1916 ; Griffin, 1976; Guinot and Richer de Forges, 1986 ), South China Sea ( Griffin and Tranter, 1986 ), Taiwan (Griffin, 1976), and Japan ( Sakai, 1965b , 1976 ), 185–592 m deep.