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Thecodont ('socket-toothed' reptile), is a catch-all ("paraphyletic") group, now considered an obsolete term, that was formerly used to describe a group of the earliest archosaurs that lived during the Permian and Triassic periods. See Archosaur for more information.
The 'Thecodonts' are not now considered monophyletic, that is, descended from a single ancestor. The group included ancestors of dinosaurs, (including birds), and ancestors of pterosaurs, and crocodilians, groups that diverged during the early Triassic.
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