Özbek M.Rasouli H.2019-10-272019-10-2720141300-01791300-0179https://doi.org/10.3906/zoo-1306-1https://hdl.handle.net/11454/26118A new subspecies of freshwater amphipod, Gammarus komareki aznavensis subsp. nov., collected from Aznav County (Khalkhal-Ardabil), northwestern Iran, is described and illustrated. The new subspecies belongs to the Gammarus pulex-group and has characteristic features similar to Gammarus komareki. Shorter flagellum of antenna 1, kidney-shaped and bigger eyes, more setose outer margin of the exopodite of uropod 3, and shorter endopodite of uropod 3 are the most obvious features that differ from G. komareki. A detailed morphological description and illustrations of the new subspecies are given and differences from related species are discussed. © TÜBİTAK.en10.3906/zoo-1306-1info:eu-repo/semantics/openAccessAmphipodaFreshwaterGammarusIranNew subspeciesArticle383326333Q3