Clade of diapsids, characterized by a minimum of the following traits: openings anterior to the orbits (antorbital fenestrae), teeth with serrations compressed laterally and none on the palate, dentary fenestrae, differently shaped calcaneum, and elongated ilium and pubis. Part of lineage of dinosaurs.

a large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts

"ruling lizards." The Division to which the Dinosaurs, Pterosaurs, and Crocodiles belong. Defined by the presence of antorbital fenestrae. Frequently shortened to archosaur.