Investigation of diversity of free-living predatory mites of the family Cheyletidae in Western Siberia, Russia, undertaken for the first time, has recorded 10 species, of which eight species are new for this region. Description of a new species Eutogenes bicornissp. nov. includes all active stages; a male of Cheletomimus (Hemicheyletia) recki (Volgin, 1966) comb. nov. is redescribed and its remanining active stages are described for the first time; Cheyletus rashtiensisSalarzehi et al. 2018 is recorded from Russia for the first time, and its female is redescribed, and tritonymph is described for the first time; Chelacheles apanaskevichiBochkov and Abramov, 2016, Cheletacarus raptorVolgin, 1961, Paracheyletia pyriformis (Banks, 1904), Cunliffella whartoni (Baker, 1949), and Bothrocheyla pavlovskyi (Volgin, 1964) are recorded from Western Siberia for the first time. Nomenclature of some setal structures of legs is discussed.
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