Early Kazanian (Middle Permian) Gastropods

Resumo

Taxonomy and stratigraphic distribution of the Early Kazanian gastropods of the Volga–Ural Region are studied. The material previously studied by Netchaev and collections from the northern areas of the paleobasin previously described by Licharew are reexamined. The Early Kazanian gastropod assemblages comprise 31 species, 20 genera, 16 families; of these four species and one genus are new; 67.7% species are in common with the Late Kazanian assemblages.