genus of reptiles
Temporal range: Pennsylvanian
|Paleothyris (details not accurate)|
Paleothyris was an early sauropsid, yet it still had some features that were more labyrinthodont-like than reptile-like. Its skull lacked fenestrae, holes found in the skulls of most reptiles and mammals.
- Pederpes, an early Mississippian tetrapod, 359–345 million years ago (mya).
- Westlothiana, from 350mya, either an early amniote or a sister group to the amniotes
- Casineria, from 340 mya, a basal amniote.
- Protoclepsydrops, from the middle Pennsylvanian, 314 mya, probable earliest synapsid
- Hylonomus, from 312 mya, another early anapsid sauropsid
- Archaeothyris, from 306 mya, an early synapsid
- Petrolacosaurus, from 302 mya, the first diapsid sauropsid