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Paleontological Journal

, Volume 52, Issue 7, pp 768–776 | Cite as

Revision of Late Permian Nonmarine Bivalves of the Genus Opokiella Plotnikov, 1949

  • M. N. UrazaevaEmail author
Article
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Abstract

The genus Opokiella occurs in the Upper Permian (upper part of the Guadalupian–Lopingian) of the East European Platform, sharply differing from members of the Palaeomutela Fauna, which prevails in this territory throughout the Permian Period. Distinctive characters of Opokiella, such as the hinge with a tubercular cardinal tooth and individual pseudotaxodont teeth anterior and posterior to the umbo, thick opisthodent parivincular ligament, and mostly homogeneous shell microstructure, suggest that this group of nonmarine bivalves should be assigned to the monogeneric family Opokiellidae Kanev, 1983 (of the suborder Anthracosiidina Silantiev and Carter, 2011, order Cardiida Férussac, 1822). The genus Opokiella is similar in external characters to nonmarine bivalves known from the Lopingian beds of Tanzania under the conventional name “Carbonicola.”

Keywords:

nonmarine bivalves paleogeography stratigraphy Permian Guadalupian Lopingian 

Notes

ACKNOWLEDGMENTS

I am grateful to A.V. Lopatin and E.A. Zhegallo (Borissiak Paleontological Institute, Russian Academy of Sciences (PIN)) for an opportunity to study the material in the Laboratory of Instrument Analytics of PIN, to V.K. Golubev (PIN), V.V. Bulanov (PIN), and V.V. Silantiev (KFU) for the valuable remarks, which allowed improvement of the manuscript.

This study was supported by the Russian Foundation for Basic Research (project no. 16-04-01062), the State Russian Government Program for Competitive Growth of Kazan Federal University among World’s Leading Scientific and Education Centers, and by the subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities.

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© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Kazan (Volga) Federal UniversityKazanRussia

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