First data on the family Dulichiidae (Amphipoda: Senticaudata) from communities of the Piip submarine volcano, the Bering Sea, with the description of a new species of Dulichiopsis

Abstract

During ROV surveys of the communities of the Piip submarine volcano in the Bering Sea, amphipods of the family Dulichiidae were observed in high abundance (up to ∼ 120 masts per 1 m²). Specimens sampled at a depth of 407 m on the northern summit were found to represent a new species, Dulichiopsis ogo sp. nov., which is described here. Dulichiopsis ogo sp. nov. most closely resembles D. barnardi Laubitz, 1977 known from the bathyal zone of the northeastern Pacific by having more developed eyes than in other congeners, and an unusually long urosomite 1 (which is longer than pleonites 1–3 combined). The new species can be distinguished from all known congeners by the presence of a dorsolateral suture between pereonites 6 and 7 and three apical spine teeth on the maxilliped inner plate. The taxonomic composition of the genus Dulichiopsis is discussed