Aetosaurs (aetosaur /eɪˌɛtoʊˈsɔr/; order name Aetosauria /eɪˌɛtoʊˈsɔriə/; from Greek, ἀετός (aetos, "eagle") and σαυρος (sauros, "lizard")) are an extinct order of heavily armoured, medium- to large-sized Late Triassic herbivorous archosaurs. They have small heads, upturned snouts, erect limbs, and a body covered by plate-like scutes. All aetosaurs belong to the family Stagonolepididae.