Protorothyrids are groups of small, lizard-like reptiles.
Eureptilia includes the small, lizard-like Protorothyrididae family of extinct reptiles. They did not have fenestrae in their heads, unlike the more advanced diapsids. In what is now North America, protorothyridids existed from the Late Carboniferous through the Early Permian periods. Many prehistoric reptile genera were supposed to belong to the protorothyridid order. While three taxa, Protorothyris, Anthracodromeus, and Cephalerpeton, were recovered as a monophyletic group, Muller and Reisz determined that Brouffia, Coelostegus, Paleothyris, and Hylonomus were more basal eureptiles, rendering the family as traditionally constituted paraphyletic. Moreover, Protorothyrids differ from other dinosaurs in that they have a relatively larger body size, a larger skull, and longer limbs, and the axis intercentrum and atlas pleurocentrum have fused.
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