Abstract
A new apseudomorph tanaidacean, Deidamiapseudes poseidon n. gen., n. sp., is fully described and illustrated based on many specimens collected in the Mar del Plata Submarine Canyon, South West Atlantic, at 1144 m depth. The new genus Deidamiapseudes is closely related to the genus Hoplomachus Guţu, 2002, from which it can be distinguished by the lack of ommatidia, and by having antennule accessory flagellum of three articles, antenna with small scale, and pleopods with a few setae. In addition, Deidamiapseudes poseidon n. gen., n. sp. was found in deep-sea waters, whereas Hoplomachus is a shallow water genus. The uncertain family position of these two genera is discussed. The name Hoplomachus Guţu, 2002, preoccupied by Hoplomachus Fieber, 1858, is replaced with the name Hoplopolemius.
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