any reptile of the subclass Archosauria, including the dinosaurs, pterosaurs, and crocodilians and characterized by two pairs of openings in the temporal region of the skull.
Any of various mostly reptilian animals of the subclass Archosauria. Archosaurs are diapsids that began to evolve in the late Permian Period, and are characterized by skulls with long, narrow snouts and teeth set in sockets. Archosaurs include the extinct dinosaurs and pterosaurs and the modern crocodilians and birds.


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