Dinosaurs and Prehistoric Animals:Texas 280 Million Years Ago

Dimetrodon and Edaphosaurus were both distant relatives of mammals which looked like big lizards with sails and lived in North America during the early Permian period, but Edaphosaurus ate plants and had a small flat head while Dimetrodon was a predator with sharp canines and other teeth for cutting up meat.

Dimetrodon - a big sail-backed predator

Edaphosaurus - a big sail-backed plant-eater

Ophiacodon - a carnivorous pelycosaur with no sail

Diadectes - an herbivore similar to amphibians and reptiles

Eryops - a semi-aquatic fish-eating amphibian