Thecodont

High Quality Content by WIKIPEDIA articles! Thecodont (socket-toothed reptile), now considered an obsolete term, was formerly used to describe a diverse range of early archosaurs that first appeared in the Latest Permian and flourished until the end of the Triassic period. The group includes the ancestors of dinosaurs, birds, pterosaurs, and crocodilians, as well as a number of extinct forms that did not give rise to any descendants.