The Synapsids, or mammal-like reptiles, were the dominant land animals of the late Palaeozoic and early Triassic. They include mammals and their ancestors, the pelycosaurs, therapsids and cynodonts. They are distinguished by the position of temporal openings in the skull behind the eyes which provides an anchor for jaw muscles, resulting in stronger jaws.- Category ID : 424200
Information from the Tree of Life Web Project on the synapsids which include mammals and all extinct amniotes more closely related to mammals than to reptiles.
Provides information on the characteristics and anatomy of synapsids with a diagram of a typical early period skull showing the synapsid arch and undifferentiated teeth.