Cladogram showing relationships of extant members of the Sauria. Numbered items are:
1. Tuatara
2. Lizards
3. Snakes
4. Crocodiles
5. Birds
"Lizards" are paraphyletic. Branch lengths do not indicate divergence times.
Prehistoric fish are various groups of fishes that lived before recorded history. A few, such as the coelacanth still exist today and are considered living fossils.
Cladogram showing relationships of extant members of the Sauria. Numbered items are:
Fish fossil from Cretaceous period
