Sapient Dimetrodon

Dimetrodon (pronounced /daɪˈmiːtrədɒn/; meaning "two measures of teeth" ) is a genus of synapsid that lived in the Cisuralian (Early) Permian period. The name Dimetrodonrefers to a range of animals under the genus, and it currently includes up to 20 subspecies in it, but the name is synonymous amongst them.

As a synapsid, it was more closely related to mammals than to true reptiles such as lizards and snakes. It is classified as a pelycosaur, which is an informal grouping composed of basal or primitive Late Paleozoic synapsids. Fossils of Dimetrodonhave been found in North America and Europe.