Rhynchocephalia (Tuataras and their relatives)
There are numerous fossil Rhynchocephalan families, however none are listed here since they did not persist until the Late Pleistocene.
Suborder: Sphenodontida
Family: Sphenodontidae (Tuataras)
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Sphenodon diversum | Colenso, 1886 | North Island tuatara | Subfossil | North Island, New Zealand | Invalid (synonym) | Access |