Ozbek, MuratYurga, LeventKulkoyluoglu, Okan2019-10-272019-10-2720131300-01791303-61141300-01791303-6114https://doi.org/10.3906/zoo-1209-14https://hdl.handle.net/11454/48086A new species of freshwater amphipod, Gammarus baysali sp. nov., collected from Cumayani Cave (Zonguldak Province, Turkey) is described and illustrated. The new species belongs to the Gammarus pulex-group. The most discriminant characters of this species are the minute eyes, densely setose fifth peduncle and flagellar segments of antenna 2, elongated pereopods, and setose anterior margins of pereopod 5 to 7. Additionally, the palp of right maxilla 1 has 4 setae along its outer margin. A detailed morphological description and illustrations of the new species are provided, and differences from related species are discussed.en10.3906/zoo-1209-14info:eu-repo/semantics/closedAccessGammarusnew speciesfreshwaterZonguldakTurkeyArticle372163171WOS:000321228800005Q4