Emydochampsa, a non-mammalian synapsid described in paleontology in 1912, is 300 million years old.
Emydochampsa is an extinct genus of non-mammalian synapsids. The distinctive temporal fenestra developed in the ancestral synapsid about 312 million years ago, during the Late Carboniferous period. He studied, described and listed hundreds of species of fossil fish, beginning the serious study into the lives of extinct animals. With the publication of the Origin of Species by Charles Darwin in 1849, the field got a theoretical framework. 
