The comb-branchial snails fauna (Gastropoda: Pectinibranchia) of the east of the European Russia, the Urals and Western Siberia

The original and published data of the gastropods fauna of Pectinibranchia subclass of the East of the European Russia, the Urals and Western Siberia are summarized. Recent list of comb-branchial snails has 46 species. Valvatidae family is most diversely represented - it includes 27 species. Bithyniidae family has 15 species. Only 2 species are registered among Viviparidae snails. Lithoglyphidae and Neritidae families include one type of each. There are 33 species of comb-branchial snails in the East of the European Russia, including the western slopes of the Urals; 32 species of them are registered in the Volga river basin (including the Kama river). In the North-East of the European Russia (the basins of the Mezen', Vychegda, Pechora and Korotaikha rivers) 12 species are found. There are 39 species on the eastern slopes of the Urals and Western Siberia. Taxonomic and nomenclatural statuses of some species of comb-branchial snails are discussed. Spatial patterns of change in the amount of the fauna of comb-branchial snails and the ratio of zoogeographical groups are analyzed. Basis of the fauna are species with European-West Siberian (52.2%), Siberian (13.1%) and European (10.9%) types of areal.