Early Cretaceous mammals of Western Siberia: 2. Tegotheriidae |
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| Authors: | A V Lopatin A O Averianov E N Maschenko S V Leshchinskiy |
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| Institution: | (1) Borissiak Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya ul. 123, Moscow, 117997, Russia;(2) Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, St. Petersburg, 199034, Russia;(3) Tomsk State University, pr. Lenina 36, Tomsk, 634050, Russia |
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| Abstract: | 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. |
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| Keywords: | Docodonta Tegotheriidae Lower Cretaceous Western Siberia |
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