| Rhynchocephalia | Gephyrosauridae †Deltadectes |
|  Rhynchocephalia | Gephyrosauridae †Gephyrosaurus |
| Rhynchocephalia | Gephyrosauridae †Penegephyrosaurus |
|  Rhynchocephalia | Sphenodontia †Diphydontosaurus |
| Rhynchocephalia | Sphenodontia †Micromenodon |
| Rhynchocephalia | Sphenodontia †Pelecymala |
| Rhynchocephalia | Sphenodontia †Rebbanasaurus |
| Rhynchocephalia | Sphenodontia †Sphenocondor |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia †Godavarisaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia †Planocephalosaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia †Theretairus |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia †Opisthiamimus |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia †Brachyrhinodon |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia †Clevosaurus |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia †Colobops |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia †Lanceirosphenodon |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia †Polysphenodon |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia †Lamarquesaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia †Pamizinsaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia †Tingitana |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia †Whitakersaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Opisthodontia †Fraserosphenodon |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Opisthodontia †Opisthias |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Opisthodontia †Trullidens |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Opisthodontia | Eilenodontinae †Eilenodon |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Opisthodontia | Eilenodontinae †Kaikaifilusaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Opisthodontia | Eilenodontinae †Patagosphenos |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Opisthodontia | Eilenodontinae †Priosphenodon |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Opisthodontia | Eilenodontinae †Toxolophosaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Sphenodontidae †Pamizinsaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Sphenodontidae †Zapatadon |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Sphenodontidae | Sphenodontinae †Sphenovipera |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Sphenodontidae | Sphenodontinae †Cynosphenodon |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Sphenodontidae | Sphenodontinae †Tika |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Sphenodontidae | Sphenodontinae †Sphenofontis |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Sphenodontidae | Sphenodontinae †Navajosphenodon |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Sphenodontidae | Sphenodontinae †Kawasphenodon |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Sphenodontidae | Sphenodontinae †Derasmosaurus |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Sphenodontidae | Sphenodontinae Sphenodon punctatus tuatara |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia †Vadasaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia †Ankylosphenodon |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia †Homoeosaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia †Sigmala |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia | Sapheosauridae †Kallimodon |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia | Sapheosauridae †Leptosaurus |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia | Sapheosauridae †Oenosaurus |
| Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia | Sapheosauridae †Piocormus |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia | Sapheosauridae †Sapheosaurus |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia | Pleurosauridae †Palaeopleurosaurus |
|  Rhynchocephalia | Sphenodontia | Acrosphenodontia | Eusphenodontia | Neosphenodontia | Leptorhynchia | Pleurosauridae †Pleurosaurus |