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The Discovery of Diadectomorph Tetrapods in the Lower Permian of Eastern Europe

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Abstract

The systematic position of the bolosaurid Stephanospondylus (Bolosaurus) traati (Tatarinov, 1974) is examined and it is reassigned to the family Diadectidae (Diadectomorpha). This taxon is the first diadectomorph species described from Eastern Europe. The simple shape of the buccal teeth, as well as the pattern of tooth differentiation along the maxilla, indicate the basal position of S. traati within Diadectomorpha and its primitiveness compared to S. pugnax, the type species of genus Stephanospondylus. The Ambedus pussilus Kissel et Reisz, 2004 is excluded from the order Diadectomorpha based on differences in organization of the dental system from the pattern occurred within the order. The similarity of the dental system of Ambedus with that of diadectids is regarded as convergent rather than phylogenetic, so the systematic position of the above genus remains uncertain. The early stages of specialization of the dentition in evolution of the family Diadectidae are discussed.

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Notes

  1. The maxilla CM47677 from Badger Creek locality in Oklahoma (USA) attributed to D. hesperis has at least five teeth at this area (Berman and Sumida, 1995), which raises doubts about the correctness of the species identification of this specimen.

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Funding

This work was supported by the Russian Foundation for Basic Research and DFG within the framework of the project no. 20-54-12013 NNIO-a, and by of Russian Foundation for Basic Research (project no. 21-54-10003 KO-a).

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Correspondence to V. V. Bulanov.

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Translated by D. Voroshchuk

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Bulanov, V.V. The Discovery of Diadectomorph Tetrapods in the Lower Permian of Eastern Europe. Paleontol. J. 57, 206–216 (2023). https://doi.org/10.1134/S0031030123020065

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