ZOOTAXA, sa.2033, ss.1-12, 2009 (SCI-Expanded)
Hydroporus artvinensis sp. n., H. cagrankaya sp. n., H. lundbergi sp. n., H. sivrikaya sp. n., and H. toledoi sp. n. (Coleoptera: Dytiscidae) are described from north-eastern Turkey. All five species belong to the longulus-group of Hydroporus Clairville, 1806. They are externally very similar and only the males can be distinguished with certainty by the shape of their aedeagi. These are figured for all five new species, together with the female genitalia of H. cagrankaya sp. n. The males of the species have the pro- and mesotarsi provided with sucker cups, what is demonstrated for H. cagrankaya sp. n. by some SEM photos. The DNA of this species was also studied; the results suggest a close relationship with H. dobrogeanus Ienistea, 1962, H. gueorguievi Wewalka, 1975, H. kraatzii Schaum, 1868, and H. sardomontanus Pederzani, Rocchi & Schizzerotto, 2004.