Sphenodontia Squamata Eosuchia Conservation status: Fossil
The Lepidosauria are a subclass of reptiles comprising the orders :
Lepidosaurians are the most successful of modern reptiles. They comprise all the reptiles with overlapping scales such as the tuataras, amphisbaenians, lizards, and snakes.
http://animaldiversity.ummz.umich.edu/site/accounts/pictures/Lepidosauria.html
