Sauropod remains from the Middle Jurassic Itat Formation of West Siberia, Russia

Abstract

Isolated sauropod teeth and caudal vertebrae from the Middle Jurassic Itat Formation of the Berezovsk coal mine, Krasnoyarsk Territory, Russia, are attributed to the endemic Asiatic eusauropod family Mamenchisauridae based mostly on phenetic similarity. The few large anterior teeth lack marginal denticles. In small, possible juvenile posterior teeth there are denticles on both mesial and distal crown margins. The anterior caudal vertebrae are deeply procoelous, while the posterior caudal vertebrae are amphicoelous, which is characteristic for the Mamenchisauridae. The Berezovsk sauropod remains represent the northernmost and westernmost record for the Mamenchisauridae and the first Middle Jurassic Asiatic eusauropod outside China.

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Acknowledgements

For assistance in the field and/or picking the concentrate, we thank I. Danilov, T. Engler, D. Grigoriev, O. Grigorieva, R. Hielscher, K. Jäger, J. Könen, I. Kuzmin, A. Lang, B. Peters, D. Rohkamp, M. Scheske, A. Schwermann, L. Schwermann, E. Syromyatnikova, and A. Valeev. We thank two anonymous reviewers for comments. Financial support was provided by the Deutsche Forschungsgemeinschaft (DFG) (grant MA 1643/14-1,3), the Russian Foundation for Basic Research (project 11-04-91331-NNIO), and the state task of the Ministry of Education and Science of the Russian Federation (project 5.4217.2017/4.6). The work was performed according to the Russian Government Program of Competitive Growth of Kazan Federal University.

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Correspondence to Alexander Averianov.

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Handling Editor: Hans-Dieter Sues.

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Averianov, A., Krasnolutskii, S., Ivantsov, S. et al. Sauropod remains from the Middle Jurassic Itat Formation of West Siberia, Russia. PalZ 93, 691–701 (2019). https://doi.org/10.1007/s12542-018-00445-8

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Keywords

  • Sauropoda
  • Mamenchisauridae
  • Middle Jurassic
  • Itat Formation
  • Siberia