A New Leptoropha (Kotlassiidae, Seymouriamorpha) Species from the Upper Urzhumian of European Russia

Abstract

A new species of the genus Leptoropha (Kotlassiidae, Seymouriamorpha), L. minima sp. nov, is described based on isolated teeth discovered in the Upper Urzhumian beds of the boundary stratotype of the Severodvinian Stage (Republic of Tatarstan, Russia). A sample from the type locality (Monastyrskii Ovrag-D) enabled the tracing of the modification of maxillar and mandibular tooth shape in individuals with skull lengths of 30–60 mm, from the tricuspid pattern to complex polycuspid fan-shaped crowns with a large (up to 14) number of complementary cusps that definitively formed the marginal portions of the protocingulum in the anteriormost jaw teeth. In addition to the type locality, individual teeth attributed to L. minima were identified from the Upper Urzhumian of the Southern Cis-Ural Region (Orenburg Region, Yashkino locality) and the lowermost Severodvinian beds of the Vyatka River basin (Kirov Region, Povoiska locality); findings of teeth of similar morphology at the Sundyr-1 locality (Mari El Republic, Russia) extend the stratigraphic distribution of Leptorophinae to the Upper Severodvinian (Lower Putyatinian) and indicate the presence of the group in the last fauna of the Dinocephalian Tetrapod Superassemblage of Eastern Europe, the Sundyr’ Tetrapod Assemblage.

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ACKNOWLEDGMENTS

The author is grateful to A.V. Minikh (Saratov State University) for the materials on Leptorophinae from localities in the Orenburg Region, and assistance in organizing excavations at tetrapod localities in the Monastery Ravine (Monastyrskii Ovrag).

Funding

This work was financially supported by grants nos. 17-04-01937 and 17-04-00410 from the Russian Foundation for Basic Research, the fundamental research program no. 22 “Evolution of the organic world and planetary processes” of the Presidium of the Russian Academy of Sciences, and also from a subsidy allocated within the Russian Government Program of Competitive Growth of Kazan Federal University.

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Correspondence to V. V. Bulanov.

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Translated by S. Semenova

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Bulanov, V.V. A New Leptoropha (Kotlassiidae, Seymouriamorpha) Species from the Upper Urzhumian of European Russia. Paleontol. J. 54, 290–296 (2020). https://doi.org/10.1134/S0031030120030053

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Keywords:

  • Kotlassiidae
  • Seymouriamorpha
  • Leptoropha minima sp. nov.
  • dental system
  • herbivory
  • Middle–Late Permian
  • Eastern Europe