On Taxonomic Affinity of Davletkulia gigantea Ivachnenko

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Abstract

The holotype (an isolated tooth) of the largest-known member of the family Bolosauridae, Davletkulia gigantea Ivachnenko, 1990, of middle Permian Yaman-Yushatyr’ locality, Orenburg Region, Russia, is reassigned to the herbivorous dinocephalians of the superfamily Tapinocephaloidea. This attribution is supported by the shape of tooth crown, patterns of wear and resorption, as well as the absence of reparative (tertiary) dentine inside the pulp cavity at the late stage of tooth functioning. The morphology of the holotype reveals the validity of D. gigantea which thus is the third representative of the group after Ulemosaurus svijagensis and U. gigas which was described from Eastern Europe, and, judging by the Otcher age of type locality, the oldest-known tapinocephaloid of the regional tetrapod assemblages.

About the authors

V. V. Bulanov

Borissiak Paleontological Institute, Russian Academy of Sciences

Author for correspondence.
Email: bulanov@paleo.ru
Russian Federation, Moscow, 117647

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