A New Hymenosomatid Crab, Elamenopsis okinawaensis, n. sp. (Crustacea: hymenosomatidae), from Okinawa, the Ryukyu Islands, Japan

Abstract

A new species of the Hymenosomatidae (Crustacea, Brachyura), Elamenopsis okinawaensis Nakasone & Takeda, n. sp., is described on the basis of two specimens (male and female) from the Aha River, on Okinawa in the Ryukyu Islands. It is easily distinguished from its congeners, E. octagonalis (Kemp), E. hirtirostris Lucas & Davie, and E. mangalis Ng, by the different structure of the male abdomen, the dactyli of the walking legs, and the male first pleopod.