The (Sphenodontidae) - family
The Tuataras (Sphenodon)
Northern Tuatara
(Sphenodon punctatus )
Brothers Island Tuatara
(Sphenodon guntheri )
Tuatara
(Sphenodon diversum )
-extinct-
(Oenosaurus) -extinct-

(Oenosaurus muehlheimensis)
-extinct-
(Cynosphenodon) -extinct-

(Cynosphenodon huizachalensis)
-extinct-
(Zapatadon) -extinct-

(Zapatadon ejidoensis)
-extinct-