Synapsids were mammal-like reptiles that lived 310-0 mya if we count with it's descendants mammals.
In Dinosaur Revolution[]
Three synapsids (without counting with mammals) appeared in Evolution's Winners. Inostrancevia, at the beginning of the episode, Ischigualastia, and Probelesodon. Although they were not dinosaurs, a relatively small number of species did survive the Permian extinction.
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