Leucosiid Crabs (Crustacea : Decapoda : Brachyura) from the Osumi Islands, Southwest Japan, with Description of a New Species of Cryptocnemus

Abstract

Leucosiid crabs obtained by dredging at depths of 35-106 m off the Osumi Islands, southwest Japan, are referred to 12 species in seven genera. A new species, Cryptocnemus trigonus, is described, and three rare species unknown since their original descriptions, viz., Cryptocnemus macrognathus Ihle, 1915, Ebalia longispinosa Ihle, 1918, and Nursia elegans Ihle, 1918, are added to the carcinological fauna of Japan. Pseudophilyra dinops Takeda, 1977 is synonymized with P. tridentata Miers, 1879, and the records of P. tridentata from Japanese waters are corrected to P. intermedia Ihle, 1918.