Cynosphenodon (/ˌsnəˈsfɛnədɒn/ 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]

Quick Facts Scientific classification, Type species ...
Cynosphenodon
Temporal range: Middle Jurassic
Diagram of preserved skull elements
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Rhynchocephalia
Family: Sphenodontidae
Genus: Cynosphenodon
Reynoso, 1996
Type species
Cynosphenodon huizachalensis
Reynoso, 1996
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Cladogram after Simoes et al. 2022.[3]

Sphenodontia

References

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