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.
Ariyama et al. (Fri,) studied this question.
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