Navajosphenodon

Navajosphenodon; Temporal range: Sinemurian–Pliensbachian PreꞒ Ꞓ O S D C P T J K Pg N
	Holotype specimen, scale bar: 1 cm
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Rhynchocephalia
Family:	Sphenodontidae
Subfamily:	Sphenodontinae
Genus:	†Navajosphenodon; Simões, Kinney-Broderick & Pierce, 2022
Type species
	Navajosphenodon sani; Simões, Kinney-Broderick & Pierce, 2022

CT scan of skull

Illustration of the skull in lateral view

Navajosphenodon is an extinct genus of sphenodontid reptile from the Early Jurassic Kayenta Formation of Arizona, United States. It is known from a fully articulated skeleton and is similar in many aspects to the extant tuatara, both belonging to the Sphenodontinae, including sharing a complete lower temporal bar. It is one of the oldest known sphenodontines.^[1]

Sphenodontia

†Diphydontosaurus

Eusphenodontia

†Planocephalosaurus

†Clevosaurus

Neosphenodontia

†Homoeosaurus

†Pleurosauridae

	†Leptosaurus +†Kallimodon

	†Sapheosauridae

Sphenodontidae

†Eilenodontinae

Sphenodontinae

†Navajosphenodon

†Cynosphenodon

†Sphenofontis

	†Kawasphenodon

	Sphenodon (tuatara)

^ Simões, Tiago R.; Kinney-Broderick, Grace; Pierce, Stephanie E. (2022-03-03). "An exceptionally preserved Sphenodon-like sphenodontian reveals deep time conservation of the tuatara skeleton and ontogeny". Communications Biology. 5 (1): 195. doi:10.1038/s42003-022-03144-y. ISSN 2399-3642. PMC 8894340. PMID 35241764.

[:0-1] Simões, Tiago R.; Kinney-Broderick, Grace; Pierce, Stephanie E. (2022-03-03). "An exceptionally preserved Sphenodon-like sphenodontian reveals deep time conservation of the tuatara skeleton and ontogeny". Communications Biology. 5 (1): 195. doi:10.1038/s42003-022-03144-y. ISSN 2399-3642. PMC 8894340. PMID 35241764.

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