Navajosphenodon

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)

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