Greek for "ground lizard"
Permian (275 million years ago)
Texas, Oklahoma, New Mexico, West Virginia, Germany
11.5 ft long
One of the oldest known plant-eating backboned animals on land. It was probably lunch for the larger Dimetrodon. Edaphrosaurus's sail was stronger than Dimetrodon's though since it was supported by bones that ran across the sail as well as up and down.