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A New Primitive Therocephalian (Theromorpha) from the Middle Permian of Eastern Europe

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Abstract

The largest East European scylacosaurid therocephalian Julognathus crudelis gen. et sp. nov. is described based on materials from the middle Permian locality of Sundyr-1, Mari El Republic, Russia. Julognathus occupied the niche of the largest predator within the Sundyr tetrapod community, forming a trophic match with the herbivorous tapinocephalian.

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  1. Late Paleozoic and Mesozoic nonmarine tetrapod communities are distinctly structured into three blocks: dominant, subdominant and aquatic (Olson, 1966; Sennikov, 1995, 2006). The dominant block was formed by terrestrial herbivorous tetrapods and the carnivores that specialized on them. The subdominant block was composed of relatively small terrestrial amphibians and reptiles which fed on small invertebrates. The aquatic block comprised tetrapods which fed on diverse aquatic organisms: plants, invertebrates and vertebrates. Each of these blocks formed a separate trophic pyramid which hardly intersected with the trophic pyramids of the other blocks.

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FUNDING

This work was supported by the Russian Foundation for Basic Research (project nos. 17-04-01937, 17‑04-00410, 17-54-10013), the program of fundamental scientific research of the Presidium of the Russian Academy of Sciences No. 22 “The evolution of the organic world and planetary processes.” The work is performed according to the Russian Government Program of Competitive Growth of Kazan Federal University.

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Authors and Affiliations

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

    Yu. A. Suchkova & V. K. Golubev

  2. Kazan Federal University, 420008, Kazan, Russia

    V. K. Golubev

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  1. Yu. A. Suchkova
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  2. V. K. Golubev
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Correspondence to Yu. A. Suchkova or V. K. Golubev.

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Translated by D. Ponomarenko

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Suchkova, Y.A., Golubev, V.K. A New Primitive Therocephalian (Theromorpha) from the Middle Permian of Eastern Europe. Paleontol. J. 53, 305–314 (2019). https://doi.org/10.1134/S0031030119030158

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