Özbek, MuratYurga, LeventKülköylüoğlu, Okan2020-12-012020-12-0120131300-01791303-6114https://app.trdizin.gov.tr//makale/TVRRMk16RXlNZz09https://hdl.handle.net/11454/65180A new species of freshwater amphipod, Gammarus baysali sp. nov., collected from Cumayanı 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.eninfo:eu-repo/semantics/openAccessBiyolojiArticle372163171