Synapsids and sauropsids are two evolutionary lineages of amniotes, which include all non-amphibian tetrapods and their descendants. Synapsids have an extra hole in their skulls, while sauropsids have a pair of holes behind their eyes. Synapsids diversified faster than sauropsids and gave rise to most of the large Permian animals, including pelycosaurs. The sauropsids took […]