Genus: Navajosphenodon SIMOES, KINNEY-BRODERICK & PIERCE, 2022
Etymology: Genus epithet comes from a combination of "Navajo," in honor of the native people from North America that inhabit the Colorado Plateau where teh specimens were found, and "sphenodon," in reference to the modern tuatara Sphenodon punctatus.

Species: sani SIMOES, KINNEY-BRODERICK & PIERCE, 2022
Etymology: Navajo, sani, "old age."

Holotype: MNA.V.12442 (previously MCZ VP 9016)

Locality: Gold Springs Quarry and Main Quarry, Adeii Eechii Cliffs, Coconino County, Arizona.

Horizon: "Silty facies" Kayenta Formation, Glen Canyon Group.

Biostratigraphy:

Age: Sinemurian-Pliensbachian Stage, Early Lias Epoch, Early Jurassic.

Material: Skull, mandibles, axis and appendicular skeleton.

Referred material:

MCZ VP 8726 (A-F), 8727, 9094, 9098, 9099, 9102, 9103, 101562, 101563, 101564, 101569, 101575: