Past and present distribution of Myxas glutinosa (O.F. Müller, 1774) in the waterbodies of the Urals and Siberia

The distribution of the glutinous snail, Myxas glutinosa (O.F. Müller, 1774) in the waterbodies of the Urals and Western Siberia has been assessed on the basis of the literary and authors’ own data. This species belongs to the rarest among the Euro-Siberian freshwater snails, and the Ural-Siberian region is the eastern part of its range. The first records of M. glutinosa in this area date back to 1889 but to the date only 48 trustworthy findings of the species in this region are known. The map of these findings is provided. Currently, M. glutinosa is extremely rare in Siberia though in the South Uralian waterbodies its abundance is still relatively high. Possible causes of decline of the glutinous snail are briefly discussed. It is shown that this species may tolerate (to some extent) water pollution, salinity and other factors that were invoked to explain its global decline.