Edaphosaurus (name meaning "Pavement Lizard") is a genus of edaphosaurid synapsid that originated during the Early Permian Era in what is now North America and Europe. The size of a hippopotamus, this sail-back mammal-like reptilian herbivore was the first plant-eating reptile to evolve.
Thought to have been extinct for 260 million years, there are still groups that remain alive on Primeval Island.