The Tuataras (Sphenodontidae) - family
(Ankylosphenodon)

(Ankylosphenodon pachyostosus)
(Cynosphenodon)

(Cynosphenodon huizachalensis)
(Oenosaurus)

(Oenosaurus muehlheimensis)
(Sphenodon)

(Sphenodon diversum)
Brothers Island Tuatara
(Sphenodon guntheri)
Northern Tuatara
(Sphenodon punctatus)
(Zapatadon)

(Zapatadon ejidoensis)