Cynodontia

Epicynodontia

Cynodont. The cynodonts ("dog teeth"), in the clade Cynodontia, are therapsids that first appeared in the Late Permian (approximately 260 Ma).

The group includes modern mammals as well as their extinct ancestors and close relatives. Nonmammalian cynodonts spread throughout southern Gondwana and are represented by fossils from South America, Africa, India, and Antarctica. In the northern continents, fossils have been found in eastern North America as well as in Belgium and northwestern France.