Authors: MURAT ÖZBEK, LEVENT YURGA, OKAN KÜLKÖYLÜOĞLU
Abstract: A 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.
Keywords: Gammarus, new species, freshwater, Zonguldak, Turkey
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