Navajosphenodon

{{Short description|Extinct genus of reptile}}

{{Automatic taxobox

| fossil_range = {{fossilrange|Sinemurian|Pliensbachian}}

| image = Navajosphenodon.webp

| image_caption = Holotype specimen, scale bar: 1 cm

| taxon = Navajosphenodon

| authority = Simões, Kinney-Broderick & Pierce, 2022

| type_species = Navajosphenodon sani

| type_species_authority = Simões, Kinney-Broderick & Pierce, 2022

}}{{Multiple image

| image1 = Navajosphenodon skull.webp

| caption1 = CT scan of skull

| image2 = Navajosphenodon.png

| caption2 = Illustration of the skull in lateral view

| direction = vertical

| align = left

}}

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.{{Cite journal |last1=Simões |first1=Tiago R. |last2=Kinney-Broderick |first2=Grace |last3=Pierce |first3=Stephanie E. |date=2022-03-03 |title=An exceptionally preserved Sphenodon-like sphenodontian reveals deep time conservation of the tuatara skeleton and ontogeny |journal=Communications Biology |language=en |volume=5 |issue=1 |page=195 |doi=10.1038/s42003-022-03144-y |pmid=35241764 |pmc=8894340 |issn=2399-3642}}

{{clade|{{clade

|1=†Diphydontosaurus

|label2=Eusphenodontia

|2={{clade

|1=†Planocephalosaurus

|2=†Clevosaurus

|label3=Neosphenodontia

|3={{clade

|1= {{clade

|1={{clade

|1=†Homoeosaurus

|2= †Pleurosauridae

|3={{clade

|1=†Leptosaurus +†Kallimodon

|2=†Sapheosauridae

}}

}}

|label2=Sphenodontidae

|2={{clade

|label2=Sphenodontinae

|1=†Eilenodontinae

|2={{clade

|1=†Navajosphenodon

|2=†Cynosphenodon

|3={{clade

|1=†Sphenofontis

|2={{clade

|1=†Kawasphenodon

|2=Sphenodon (tuatara)

}}}}}}}}}}}}}}}}|label1=Sphenodontia}}