FLTXCAA9LODRCA82GGGMCAABAKJBCA1H1941CALDV1CDCA8GSYEYCAEVCJE9CA5OM0XTCAV1LRUZCAV2NAE3CAUN6PAQCA5L8AHRCACLM3DACAVXEH5JCA1CCOXXCAUPQXCVCA4PAKWUCABSVG2ACAMQ0XNR.jpgDimetrodon named in 1884 (meaning "two measures of teeth") was a predatory synapsid ("mammal-like reptile") genus that flourished during the permian period, living between 280-265 million years ago. It was about 11.5 feet long and weighed about 550 LBS. It was about 3 feet tall at the hips. It was more closely related to mammals than to true reptiles such as lizards.
Dimetrodon was not a dinosaur, despite being popularly grouped with them. Rather, it is classified as a pelycosaur. Fossils of Dimerodon have been found in North America and Europe, as well as a significant discovery if Dimetrodon foot print in Southern New Mexico.

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Another protomammal was called Diictodon.

Another protomammal was called a Goronops.

Another protomammal was called a Dimetrodon.

Another protomammal was called Ophiacodontidae

Another porotomammal was called Cynognathus.