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Paleontological Journal

, Volume 40, Issue 6, pp 668–677 | Cite as

Itatodon tatarinovi (Tegotheriidae, Mammalia), a docodont from the Middle Jurassic of Western Siberia and phylogenetic analysis of Docodonta

  • A. O. Averianov
  • A. V. Lopatin
Article

Abstract

Itatodon tatarinovi Lopatin et Averianov, 2005 is represented by two lower molars and a lower molar fragment from the upper part of the Itat Formation (Bathonian Stage) of the Berezovskii quarry (southern Krasnoyarsk Region). Based on the presence of a pseudotalonid, bordered by the crests a-b, b-e, e-g, and a-g, Itatodon is assigned to the endemic Asian family Tegotheriidae. In this genus, the crest a-b is reduced and the thick lingual cingulid is better developed than that of other docodonts. Phylogenetic analysis of Docodonta shows paraphyly of Morganucodonta relative to docodonts and independent development of the pseudotalonid in the Tegotheriidae and the clade comprising Krusatodon, Castorocauda, Cyrtlatherium, and Dsungarodon.

Key words

Docodonta Middle Jurassic Western Siberia phylogenetic analysis 

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Copyright information

© Pleiades Publishing, Inc. 2006

Authors and Affiliations

  • A. O. Averianov
    • 1
  • A. V. Lopatin
    • 2
  1. 1.Zoological InstituteRussian Academy of SciencesSt. PetersburgRussia
  2. 2.Paleontological InstituteRussian Academy of SciencesMoscowRussia

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