Materials on the Fauna and Ecology of Rotifers in the Urals: The Family Synchaetidae (Rotifera, Eurotatoria, Ploima), the Genera Ploesoma and Synchaeta

—Information on the distribution in the Urals of the rotifer genera Ploesoma Herrick 1885 and Synchaeta Ehrenberg 1832, family Synchaetidae, is summarized based on the author’s research and an analysis of the literature sources. Data on their localities, biology, and quantitative development in the Urals’ waters are presented. Ploesoma hudsoni (Imhof 1891), Synchaeta grandis Zacharias 1893, Synchaeta oblonga Ehrenberg 1831 and Synchaeta pectinata Ehrenberg 1832 are the most common species in the Urals’ waters while the other species are rare and little-known because their habitats are poorly investigated. Some species of Synchaetidae from adjacent regions may well be recorded in the Urals due to climate change.