Cynosphenodon
| Cynosphenodon Temporal range:
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|---|---|
| File:Cynosphenodon.svg | |
| Diagram of preserved skull elements | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Rhynchocephalia |
| Suborder: | Sphenodontia |
| Infraorder: | Eusphenodontia |
| Clade: | Neosphenodontia |
| Family: | Sphenodontidae |
| Subfamily: | Sphenodontinae |
| Genus: | †Cynosphenodon Reynoso, 1996 |
| Type species | |
| †Cynosphenodon huizachalensis Reynoso, 1996
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Cynosphenodon (/ˌsaɪnəˈsfɛnədɒn/ SY-nə-SFEN-ə-don; "Dog Sphenodontian") is an extinct genus of rhynchocephalian in the family Sphenodontidae from the Middle Jurassic La Boca Formation of Tamaulipas, Mexico. It is known from a largely complete lower jaw and fragments of the upper jaw. It is suggested to be among the closest known relatives of the tuatara, with both being placed in the Sphenodontinae,[1] which is supported by among other characters, the growth pattern of the teeth.[2]
Cladogram after Simoes et al. 2022.[3]
| Sphenodontia |
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References
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- ^ Reynoso, V. H. (2003). Growth patterns and ontogenetic variation of the teeth and jaws of the Middle Jurassic sphenodontian Cynosphenodon huizachalensis (Reptilia: Rhynchocephalia). Canadian Journal of Earth Sciences 40(4), 609–619
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