Representatives of 2 families with 10 genera contained 30 species with some subspecies are known for territory of Russia and adjacent countries (former USSR). As a result of studying of research collection and literature data authors supplemented data on ecology and distribution of the representatives of these families, and specified diagnoses and taxonomic position of some rare and little-known species. Anatomical characters of genitalia for most species are given. Systematic position and synonymy for some species was revised. It is established that Leiostyla nemethi Hausdorf, 1996 belongs to the genus Euxinolauria and probably, is the representative of new subgenus. It is also established that Leiostyla adolfi Pokryszko, 1991 is junior synonym of Euxinolauria (Caucasipupa) p. paulinae (Lindholm, 1913). Systematic position of Orculella (?) pfeiferi Hausdorf, 1996 is discussed. The appendix contains the check-list of fossil forms of Orculoidea from the territory former the USSR. List of bibliography contains 132 references.