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A New Pareiasaur (Parareptilia) from the Lower Vyatkian (Upper Permian) of Orenburg Region, Russia

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Abstract

A new genus and species of pareiasaurs, Senectosaurus karamzini Boyarinova et Golubev gen. et sp. nov., is described based on remains of the postcranial skeleton of a large adult individual from the Lower Vyatkian of the Preobrazhenka-2 locality (Orenburg Region). The new pareiasaur is characterized by large postcranial platform-type osteoderms. The osteoderms are flattened, with flat ventral and slightly convex dorsal surfaces, and one to three contact facets of serrate or squamous sutures with adjacent osteoderms, without dorsal elevation and fossae circumcinctae but with numerous large fossae on the dorsal surface of the platform. The absence of the dorsal elevation distinguishes the new pareiasaur from all known pareiasaurs with postcranial osteoderms.

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Notes

  1. In the largest specimen of Scutosaurus karpinskii (specimen PIN, no. 2005/1535), the axial length of the skull is 53 cm and that of the femur is 42–43 cm. For reconstructing the skull length of Senectosaurus karamzini gen. et sp. nov., we assumed that the proportions of these body parts were the same in Scutosaurus karpinskii and Senectosaurus karamzini.

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ACKNOWLEDGMENTS

The authors are sincerely grateful to I.O. Gromova for the excellent preparation of the material and V.V. Bulanov for providing additional samples from his collections and assistance in their preparation for study, as well as to A.A. Tyuryukanova and students of the Department of Paleontology of the Geological Faculty of Lomonosov Moscow State University Ya.E. Shpolskii and G.S. Shcherbakov for assistance in material treatment.

Funding

The study was supported by the Russian Science Foundation, grant no. 23-27-00311, https://rscf.ru/en/project/23-27-00311/.

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Authors and Affiliations

  1. Borissiak Paleontological Institute, Russian Academy of Sciences, 117647, Moscow, Russia

    E. I. Boyarinova & V. K. Golubev

  2. Kazan (Volga Region) Federal University, 420008, Kazan, Russia

    E. I. Boyarinova

Authors
  1. E. I. Boyarinova
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  2. V. K. Golubev
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Correspondence to E. I. Boyarinova or V. K. Golubev.

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The authors declare that they have no conflict of interest.

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Translated by D. Zabolotny

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Boyarinova, E.I., Golubev, V.K. A New Pareiasaur (Parareptilia) from the Lower Vyatkian (Upper Permian) of Orenburg Region, Russia. Paleontol. J. 57, 646–658 (2023). https://doi.org/10.1134/S0031030123060023

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  • DOI: https://doi.org/10.1134/S0031030123060023

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