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Temporal range: Middle Triassic
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Order: Therapsida
Suborder: Cynodontia
Stem group: Gomphodontia
Family: Trirachodontidae
Genus: Neotrirachodon
Tatarinov, 2002
N. expectatus
Binomial name
Neotrirachodon expectatus
Tatarinov, 2002[1]

Antecosuchus ochevi
Tatarinov, 1973 (in part)

Neotrirachodon is an extinct genus of cynodonts which existed in Russia during the Middle Triassic period. It contains the type and only species Neotrirachodon expectatus.[3]

It is known from a jaw fossil consisting of the left dentary with postcanines. It was recovered from the Donguz Formation, Orenburg Oblast of Russia.[4][5] The fossil was first described as belonging to the genus Antecosuchus (as Antecosuchus ochevi), a traversodont.[4]

It has tentatively been classified as a trirachodontid gomphodont pending further fossil discoveries. Gomphodonts (or tritylodonts) are herbivorous cynodonts.[6] If correct, it would be the first trirachodontid described from Russia.[4]

Its classification remains uncertain, however. Other studies treat it as an incertae sedis gomphodont, while others propose that it is more likely to be a bauriid therocephalian rather than a trirachodontid.[7]

See also[edit]


  1. ^ "Order: Theriodontia Owen, 1881". Retrieved June 22, 2011.
  2. ^ Mikko Haaramo (March 11, 2008). "Tritylodontoidea – tritylodonts, traversodonts and relatives". Mikko's Phylogeny Archive. Retrieved June 22, 2011.
  3. ^ L.P. Tatarinov (2002). "Gomphodont cynodonts (Reptilia, Theriodontia) from the Middle Triassic of Orenburg Region". Paleontological Journal. 36 (3): 176–179.
  4. ^ a b c Karin Dykes; Trevor Dykes; Natalie Dykes & Lukas Dykes. "Triassic Cynodonts; Cynognathia, an internet directory". Archived from the original on August 27, 2003. Retrieved June 22, 2011.
  5. ^ Tracy L. Ford. "2002 articles: Theriodontia". Dino Hunter. Retrieved June 22, 2011.
  6. ^ F. Abdala; J. Neveling & J. Welman (2006). "A new trirachodontid cynodont from the lower levels of the Burgersdorp Formation (Lower Triassic) of the Beaufort Group, South Africa and the cladistic relationships of Gondwanan gomphodonts". Zoological Journal of the Linnean Society. The Linnean Society of London. 147: 383–413. doi:10.1111/j.1096-3642.2006.00224.x.
  7. ^ Ke-Qin Gao; Richard C. Fox; Chang-Fu Zhou & Da-Qing Li (2010). "A New Nonmammalian Eucynodont (Synapsida: Therapsida) from the Triassic of Northern Gansu Province, China, and its Biostratigraphic and Biogeographic Implications" (PDF). Novitates. American Museum of Natural History (3685): 1–25. ISSN 0003-0082. Retrieved June 24, 2011.