A revision of the genus Elimedon J. L. Barnard, 1962 (Crustacea, Amphipoda, Tryphosidae) with the addition of two new species from the Clarion-Clipperton Zone, Central Pacific Ocean

Two new species are described in the genus Elimedon within the family Tryphosidae from depths between 4026–4299 m in the Clarion-Clipperton Zone, Pacific Ocean. A revised diagnosis of Elimedon is provided clarifying the characters which distinguish the genus from the closely related Hippomedon and allied genera. Elimedon breviclunis sp. nov. is described from eight specimens collected between 4273–4299 m depth and is characterised by a strongly shortened uropod 3 inner ramus and a telson which is long and deeply cleft, with widely separated lobes.

Elimedon zabka sp. nov. is described from a single specimen of unknown sex collected at 4026 m depth. This species is characterised by a strongly shortened uropod 3 inner ramus, and a shortened (length equal to width) truncate telson. Molecular barcode data are also provided for the two species.

The new species are fully illustrated and a key to the four species of Elimedon is provided.