Cynosphenodon

Cynosphenodon; Temporal range: Middle Jurassic PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Subphylum:	Vertebrata
Class:	Sauropsida
Subclass:	Diapsida
Infraclass:	Lepidosauria
Order:	Sphenodontia
Family:	Sphenodontidae
Subfamily:	Sphenodontinae
Tribe:	Sphenodontini
Genus:	Cynosphenodon †
Species
	C. huizachalensis † (type) Reynoso, 1996;

Cynosphenodon (/ˌsaɪnəˈsfɛnədɒn/ SY-nə-SFEN-ə-don; "Dog Sphenodontian") is an extinct genus of the family Sphenodontidae from the Middle Jurassic La Boca Formation of Tamaulipas, Mexico. Growth patterns in the teeth of Cynosphenodon suggest its close relationship with the modern tuatara.^[2]

Notes

^ Reynoso, V. H. (1996). A middle Jurassic Sphenodon-like sphenodontian (Diapsida: Lepidosauria) from Huizachal Canyon, Tamaulipas, Mexico. Journal of Vertebrate Paleontology 16(2), 210-221.
^ 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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