The genus Orthopsyllus Brady & Robertson, 1873 (Harpacticoida, Orthopsyllidae) presently includes six species, as well as six subspecies considered within its type species. Orthopsyllus koprii, new species, is described from Barton Peninsula, Maxwell Bay, King George Island, Antarctica and can be distinguished from its congeners by the presence of an inner seta on the middle exopodal segments of P2 and P3. Orthopsyllus spinicaudatus Krishnaswamy, 1957 also carries an inner seta on these segments but differs in the presence of a single apical seta on the endopod of P2.
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