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 […]
Synapsids are a group of amniotes that includes mammals and their extinct relatives, while sauropsids include reptiles, birds, and extinct relatives. The only living synapsids are mammals, and early synapsids were sometimes called “naked lizards.” Synapsids evolved differentiated teeth and became more mammalian over time. The first synapsid, Archaeothyris, was slightly larger than the earliest […]
