Alternative spelling: Thecodonta
Invalid subtaxa: Crenelosaurus Ortlam 1967 [nomen dubium], Crenelosaurus nigrosilvanus Ortlam 1967 [nomen dubium], Ocoyuntaia Rusconi 1947 [nomen dubium], Ocoyuntaia arquata Rusconi 1947 [nomen dubium], Ocuyuntaia Rusconi 1947 [nomen dubium], Ocuyuntaia arquata Rusconi 1947 [nomen dubium], Seemannia Huene 1958 [nomen dubium], Seemannia palaeotriadica Huene 1958 [nomen dubium], Shansisuchus heiyuekouensis Young 1964 [nomen dubium]
Parent taxon: Archosauria according to R. L. Carroll 1988
Sister taxa: Avemetatarsalia, Dongusia, Erpetosuchidae, Longisquamidae, Neoarchosauria, Proterochampsidae, Pseudosuchia, Razanandrongobe, Shimmelia, Sikannisuchus, Smok, Theropodomorpha
Subtaxa: Aetosauridae, Clarencea, Doswelliina, Gracilisuchidae, Pallisteria, Pelycosimia, Platyognathidae, Proterosuchia, Teleocrater
Ecology: carnivore