Abstract
Abstract The Pseudomma G.O. SARS, 1870 species found associated with North Atlantic waters have often been subject to mis-identification. Methods for identifying the species P. affine G. O. SARS, 1870, P. frigidum HANSEN, 1908, P. kruppi W.M. TATTERSALL, 1909, P. nanum Holt & Tatiersall, 1906, P. roseum G.O. SARS, 1870, P. truncatum SMITH, 1879, and a new species Pseudomma jasi n.sp. have been developed, resulting in a complete redescription and an update of their distribution in the Norwegian Sea. A key to the north Atlantic Pseudomma species is also given. Body length variation alone is so great between populations of a single species, that characters directly correlated to size are found to be practically useless. Characters reliable in distinguishing specimens on the species level include setae number on the mandibular palp's terminal segment, setae number on the maxillule and maxilla, and by outer setae number of the antennal scale's apex. In adult individuals armature ofthe telson's apex was reliabl...
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