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Deep-sea amphipod genus Eurythenes from Japan, with a description of a new Eurythenes species from off Hokkaido (Crustacea: Amphipoda: Lysianassoidea)


Two species of the giant deep-sea amphipod genus Eurythenes are reported from two bathyal habitats in Japanese waters based on a morphological examination and DNA analyses. The new species E. aequilatus collected off Hokkaido in the Sea of Okhotsk comprises a distinctive lineage within the known Eurythenes species and genetic groups. This finding sheds light onto the overlooked role of the marginal deep sea in the species diversification history of Eurythenes. Eurythenes specimens collected from the south off Okinawa Island in the Philippine Sea were identified as E. magellanicus, confirming the presence of a population in the western North Pacific. Past and present trans-oceanic dispersal of this species is briefly discussed based on the mitochondrial DNA sequences obtained from the Okinawa specimens of E. magellanicus.

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The authors are grateful to Keiichi Kakui (Hokkaido University), Atsushi Kaneko (Okinawa Churaumi Aquarium, OCA), and Kenta Yamada (OCA) for providing valuable specimens of Eurythenes species. We also express our sincere thanks to Hidetoshi Nagamasu (The Kyoto University Museum) for his helpful advice on a specific name for the new species, and to Cédric d’Udekem d’Acoz (Royal Belgian Institute of Natural Sciences) and one anonymous reviewer for their constructive comments and suggestions on this manuscript. Thanks are extended to the captain and crew of the R/V Soyo-Maru (Japan Fisheries Research and Education Agency). This study was partly supported by JSPS KAKENHI grant numbers JP25242015, JP25840140, and JP15J00720.

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Correspondence to Takafumi Nakano.

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Narahara-Nakano, Y., Nakano, T. & Tomikawa, K. Deep-sea amphipod genus Eurythenes from Japan, with a description of a new Eurythenes species from off Hokkaido (Crustacea: Amphipoda: Lysianassoidea). Mar Biodiv 48, 603–620 (2018).

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  • Eurytheneidae
  • Molecular phylogeny
  • Cryptic species
  • Pacific Ocean
  • Long-distance dispersal