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Temporal range: Middle Permian- Early Triassic, 261–247 Ma
Thrinaxodon liorhinus.jpg
Skull and neck vertebrae of Thrinaxodon liorhinus in CosmoCaixa Barcelona
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Order: Therapsida
Suborder: Cynodontia
Clade: Epicynodontia
Family: Thrinaxodontidae
Watson and Romer, 1956

Thrinaxodontidae is an extinct family of cynodonts that includes the genera Thrinaxodon, Nanictosaurus, Nanocynodon, and Novocynodon, and possibly Bolotridon and Platycraniellus.[1] All thrinaxodontids share a bony secondary palate. Thrinaxodontids are basal members of the cynodont clade Epicynodontia. Some studies consider the family a paraphyletic group, representing an evolutionary grade of basal epicynodonts rather than an actual clade.[2]


  1. ^ Ivakhnenko, M. F. (2012). "Permian Cynodontia (Theromorpha) of Eastern Europe". Paleontological Journal. 46 (2): 199–207. doi:10.1134/S0031030112020062. 
  2. ^ Abdala, F. (2007). "Redescription of Platycraniellus elegans (Therapsida, Cynodontia) from the Lower Triassic of South Africa, and the Cladistic Relationships of Eutheriodonts". Palaeontology. 50 (3): 591–618. doi:10.1111/j.1475-4983.2007.00646.x.