Ozbek, MuratOzkan, Nurcan2024-06-122024-06-1220111175-53261175-5334https://hdl.handle.net/20.500.14551/21210A new amphipod species, Dikerogammarus istanbulensis sp. nov., is described. Specimens were collected from a reservoir, near Silivri district, Istanbul province, Turkey. The new species is similar to Dikerogammarus bispinosus Martynov, 1925 except for the presence of setae on inner surface of basal segment of pereopod 7 in both sexes and absence of long setae on the ventral side of second peduncle segment of antenna 1. In addition, epimeral plate 2 has many setae along the ventral margin in both sexes. A detailed morphological description and illustrations of the new species are given. Differences between the new species and related species are discussed. An identification key for the genus Dikerogammarus is presented.eninfo:eu-repo/semantics/closedAccessFresh WatersAmphipodaNew SpeciesPonto-CaspianSilivriBalkansArticle28135564Q3WOS:0002892279000022-s2.0-79953875947Q2