and dinosauromorphs together formed the group Ornithodira, which encompasses almost all avemetatarsalians.

Dinosauriformes was coined in 1992 by F.E. Novas, who used it to encompass dinosaurs, Lagosuchus, "Pseudolagosuchus" (=Lewisuchus), and the herrerasaurids, which he did not consider to be "eudinosaurs" (true dinosaurs like ornithischians and saurischians). Contrary to Novas,