pelycosaur

Any of various extinct, chiefly carnivorous synapsids of the Carboniferous and Permian Periods, including the dimetrodon and other species with saillike structures along the back.

A large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America.

large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America