Dimetrodon (meaning "two measures of teeth") was a predatory synapsid genus that flourished during the Permian period, living between 280-265 million years ago (Artinskian to Capitanian stages). It was more closely related to mammals than to true reptiles such as lizards. It is classified as a pelycosaur. Fossils of Dimetrodon have been found in North America and Europe. Read more