Paleontological Journal

, Volume 43, Issue 4, pp 453–462 | Cite as

Early Cretaceous mammals of Western Siberia: 2. Tegotheriidae

  • A. V. Lopatin
  • A. O. Averianov
  • E. N. Maschenko
  • S. V. Leshchinskiy


New specimens of the tegotheriid docodont Sibirotherium rossicum Maschenko et al., 2003, including a maxillary fragment with two posterior teeth, an isolated upper molar, and mandibular fragments with teeth from the Early Cretaceous Shestakovo locality are described. The dental formula of Sibirotherium is I1 + ?C1P6M6?. The upper molars of Sibirotherium, with two main labial and three lingual cusps, are convergently similar to the molars of tribosphenic mammals. In the dentary, the symphysis is short and Meckel’s groove is reduced. Sibirotherium is similar in the structure of lower teeth to Tegotherium from the Upper Jurassic of Mongolia; it is the latest known representative of Docodonta.

Key words

Docodonta Tegotheriidae Lower Cretaceous Western Siberia 


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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • A. V. Lopatin
    • 1
  • A. O. Averianov
    • 2
  • E. N. Maschenko
    • 1
  • S. V. Leshchinskiy
    • 3
  1. 1.Borissiak Paleontological InstituteRussian Academy of SciencesMoscowRussia
  2. 2.Zoological InstituteRussian Academy of SciencesSt. PetersburgRussia
  3. 3.Tomsk State UniversityTomskRussia

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