anapsid

Subclass Anapsida (turtles, tortoises, terrapins) No temporal skull openings; body encased in bony shell; no teeth in living members; oviparous. Subclass Lepidosauria No bipedal specializations; 2 complete temporal openings; complete palate; oviparous; male is without penis. Subclass

…the snakes and lizards; early anapsids, ancestors of turtles; early archosaurs, ancestors of the large ruling reptiles of the Mesozoic; and synapsids, a common and varied group of mammal-like reptiles that eventually gave rise to mammals in the Mesozoic.

…primitive group, the anapsids (or Parareptilia). The early reptiles were usually small animals and generally were not as abundant as some of the synapsids, such as the sailback pelycosaurs (Edaphosaurus, Dimetrodon, and others). Assorted parareptiles occurred throughout the Permian Period (299 million to 251 million years ago), but they largely…