A new species of Antarctodius (Crustacea: Amphipoda: Odiidae) associated with a sea urchin Clypeaster japonicus

Abstract

Antarctodius echinicola, a new species of the odiid amphipod associated with a sea urchin Clypeaster japonicus, is described from Ehime Prefecture in Japan. This species can be distinguished from its congeners by the non-keeled pereonites, the pleonite 3 without posterolateral projection, and the antenna 1 flagellum. Diagnoses of the family Odiidae and the genus Antarctodius are emended and a key to the species of the genus is provided.