What question did this study set out to answer?

This research aims to describe a new species of Epimeria found at extreme ocean depths and to update biogeographic knowledge of the genus.

March 24, 2026Open Access

A new species of Epimeria (Amphipoda, Epimeriidae) from hadal depths in the Aleutian Trench with biogeographic notes of the genus

Key Points

This research aims to describe a new species of Epimeria found at extreme ocean depths and to update biogeographic knowledge of the genus.
Description of the new species based on morphological characteristics
Collection from hadal depths in the Aleutian Trench at 6503 m
Comparison with previously described Epimeria species
Provision of an updated identification key for Pacific Epimeria species
Discovery of the deepest recorded Epimeria species at 6503 m
Identification of unique morphological features, including large size and distinct coxa characteristics
Inclusion of the new species in the existing count of 92 Epimeria species, enhancing knowledge of the genus's diversity in the Pacific.

Abstract

• A new, large species of Amphipoda from hadal depth. • Dorsal and medial sculpturation sets the new species apart from previously described species. The amphipod genus Epimeria comprises of hitherto 92 accepted species, of which with 19 are known from the Pacific. We here present a new species of Epimeria , from the first time from hadal depths, from the Aleutian Trench in the northern part of the North Pacific. From a depth of 6503 m this is the deepest Epimeria to record. The new species is easily recognised both by its large size of over 5 cm, as well as its coxa 4 which has a sharp mid-coxal protrusion, by having carinal bumps starting at pereon segment 1, and sharp drawn out teeth at the epimeron. An updated key to the Pacific species of Epimeria is provided.

A new species of Epimeria (Amphipoda, Epimeriidae) from hadal depths in the Aleutian Trench with biogeographic notes of the genus

Key Points

Abstract

Cite This Study

Also Consider

Also Consider