Sphenodontia
The Order Sphenodontia contains only one living genus, Sphenodon, which represents the two living species of tuatara.
The order also contains several extinct groups: the Gephyrosauridae and the Pleurosauridae.
The Order Sphenodontia contains only one living genus, Sphenodon, which represents the two living species of tuatara.
The order also contains several extinct groups: the Gephyrosauridae and the Pleurosauridae.