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June 4, 2026Plankton and Benthos Research0 citationsOpen Access

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

HAHiroyuki AriyamaSHSonoko Hamada

Key Points

  • The study aims to describe a new amphipod species associated with a sea urchin, enhancing the taxonomy of the Odiidae family.
  • Description of the new species based on morphological characteristics
  • Emendation of the family and genus diagnoses
  • Development of a key for species identification within the genus Antarctodius.
  • Antarctodius echinicola is characterized by non-keeled pereonites and a unique flagellum structure
  • Pleonite 3 lacks a posterolateral projection, distinguishing it from similar species
  • Emended descriptions facilitate accurate identification of Odiidae family members.

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.

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Cite This Study

Ariyama et al. (2026) studied this question.

synapsesocial.com/papers/6a211591d499ed480b16e9c4https://doi.org/10.3800/pbr.21.128
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