Phylogeny
The cladogram presented here illustrates the "family tree" of sauropsids, and follows a simplified version of the relationships found by Laurin and Gauthier (1996), presented as part of the Tree of Life Web Project.
| Sauropsida |
| unnamed |
| Anapsida |
|
Mesosauridae
|
|
| unnamed |
|
Millerettidae
|
|
| unnamed |
|
Lanthanosuchidae
|
|
| unnamed |
|
Nyctiphruretia
|
|
| unnamed |
|
Pareiasauria
|
|
|
Procolophonoidea
|
|
|
|
|
?Testudines (turtles, tortoises, and terrapins)
|
|
|
|
|
|
|
|
|
|
| Romeriida |
|
Captorhinidae
|
|
| unnamed |
|
Protorothyrididae*
|
|
| Diapsida |
|
Araeoscelidia
|
|
| unnamed |
|
Younginiformes
|
|
| Sauria |
|
?Ichthyosauria
|
|
|
?Sauropterygia
|
|
|
Lepidosauromorpha (lizards, snakes, tuatara, and their extinct relatives)
|
|
|
Archosauromorpha (crocodiles, birds, and their extinct relatives)
|
|
|
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|
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|
|
|
|
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|
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