Dinodontosaurus

Dinodontosaurus (meaning "terrible-toothed lizard") is a genus of dicynodont therapsid. It was medium to large dicynodont of the Triassic (with skull up to 40 centimetres (16 in) long^[1]) and had a beak corneum. It lived in the Middle Triassic but disappeared in the Upper Triassic.

Dinodontosaurus Temporal range: Mid-Late Triassic ~242–235 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Mounted Dinodontosaurus skeleton
D. tener illustration
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Suborder:	†Anomodontia
Clade:	†Dicynodontia
Clade:	†Kannemeyeriiformes
Genus:	†Dinodontosaurus Romer, 1943
Type species
†Dinodontosaurus oliveirai Romer, 1943 [Junior synonym]
Species
D. brevirostris Cox, 1968 D. tener (Huene, 1935) D. turpior (Huene, 1935) [nomen dubium]
Synonyms[1]
Genus synonymy Chanaria Cox, 1968 Diodontosaurus Tupí-Caldas, 1936 [nomen suppressum] Species synonymy Synonyms of D. brevirostris: Chanaria platyceps Cox, 1968 D. platygnathus Cox, 1968 Synonyms of D. tener: Diodontosaurus pedroanum Tupí-Caldas, 1936 D. oliveirai Romer, 1943

Species

• Dinodontosaurus tener is the most common species of dicynodont that existed in the Middle Triassic, and more common in the fossil layers that age in Rio Grande do Sul, in Rota Paleontológica. They are found mainly in the Paleontological Site Chiniquá in São Pedro do Sul and Candelária, where a group of ten pups were found together, demonstrating that these animals had strategies for coexistence in a group and caring for their offspring. Diodontosaurus pedroanum Tupi-Caldas, 1936 and Dinodontosaurus oliveirai, Romer 1943 are synonyms.^[2]
• Dinodontosaurus brevirostris is known from remains found in Argentina. Chanaria platyceps Cox, 1968 and Dinodontosaurus platygnathus are synonyms.

Phylogeny

Dinodontosaurus in a cladogram from Szczygielski & Sulej (2023):^[3]

Kannemeyeriiformes	Shansiodontidae Rhinodicynodon Tetragonias Shansiodon Vinceria Dinodontosaurus "Kannemeyeriidae" Dolichuranus Acratophorus Rabidosaurus Wadiasaurus Sinokannemeyeria Parakannemeyeria Xiyukannemeyeria Rhadiodromus Shaanbeikannemeyeria Kannemeyeria Rechnisaurus Uralokannemeyeria Angonisaurus Woznikella Stahleckeriidae

Gallery

• 
  Skull (side)
• 
  Skull (front)
• 
  D. tener juveniles

References

1. Kammerer, C. F.; Ordoñez, M. D. (2021). "Dicynodonts (Therapsida: Anomodontia) of South America". Journal of South American Earth Sciences. 108: 103171. Bibcode:2021JSAES.10803171K. doi:10.1016/j.jsames.2021.103171. S2CID 233565963.
2. Paleobiology Database.
3. Szczygielski, T.; Sulej, T. (2023). "Woznikella triradiata n. gen., n. sp. – a new kannemeyeriiform dicynodont from the Late Triassic of northern Pangea and the global distribution of Triassic dicynodonts". Comptes Rendus Palevol. 22 (16): 279–406. doi:10.5852/cr-palevol2023v22a16.