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Paleontological Journal

, Volume 50, Issue 6, pp 585–600 | Cite as

Evolution of the genus Baylea (Gastropoda) in the Kazan Paleobasin (Middle Permian, Volga–Ural Region)

  • A. V. MazaevEmail author
Article

Abstract

An assemblage of species of the genus Baylea (B. subpenea (Netchaev, 1894), B. vjatkensis Mazaev, 2015, B. praeburtasorum sp. nov., and B. shilovskyi sp. nov.) from the Lower Kazanian Substage (Middle Permian) is described. It is shown that this assemblage is phylogenetically connected with the Late Kazanian species B. rigida Mazaev, 2015, B. foraminata Mazaev, 2015, B. chimbulatiensis Mazaev, 2015, B. nemdaensis Mazaev, 2015, and B. burtasorum (Golowkinsky, 1868). Index species of three stratigraphic intervals are recognized: B. praeburtasorum sp. nov.–B. shilovskyi sp. nov., B. rigida–B. foraminata, and B. burtasorum. The morphology and polymorphism of the studied species are discussed.

Keywords

Gastropoda Baylea morphology polymorphism systematics Paleozoic Permian Roadian Kazanian Stage Volga–Ural region 

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© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  1. 1.Borissiak Paleontological InstituteRussian Academy of SciencesMoscowRussia

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