Abstract
Hydroporus sejilashan sp. n. is described from Xizang Autonomous Region (Qinghai-Tibet Plateau), China. It belongs tothe acutangulus-complex of the Hydroporus planus-group and can be separated from all four other members of the speciescomplex by the completely distinctly matt surface in both sexes. In addition it can be distinguished from Hydroporusacutangulus Thomson, 1856 and H. polaris Fall, 1923 by the shape of the anterior protarsal claw, which is strongly curvednear the base and more straight distally in the latter two species, but evenly curved in the new species and in the other twospecies of the complex, namely H. tibetanus Zaitzev, 1953 and H. tuvaensis Pederzani, 2001. The habitus of all fivemembers of the complex are provided, along with illustrations of the male and female genitalia of the new species andthose of H. tibetanus. The lectotype of H. sumakovi Poppius, 1912, a taxon which until now has been treated as a juniorsynonym of H. acutangulus, is designated. Preliminary studies reveal that H. sumakovi is probably more closely relatedto H. polaris than to H. acutangulus. Older, doubtful previous records of Hydroporus nigellus Mannerheim, 1853 fromChina are confirmed with new records from Qinghai and Sichuan Provinces. Twelve species of the genus Hydroporus Clairville, 1806 are now known from China, only two of which occur in Tibet.References
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