Özbek, MuratYurga, LeventKülköylüo?lu, Okan2024-09-252024-09-2520131303-6114https://doi.org/10.3906/zoo-1209-14https://search.trdizin.gov.tr/tr/yayin/detay/146312https://hdl.handle.net/20.500.12491/12651A new species of freshwater amphipod, Gammarus baysali sp. nov., collected from Cumayani{dotless} 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. © TÜBİTAK.eninfo:eu-repo/semantics/openAccessFreshwaterGammarusNew speciesTurkeyZonguldakArticle10.3906/zoo-1209-143721631712-s2.0-84874409322Q3146312