The thecodonts were a diverse group of Triassic reptiles that included large four-legged carnivores, armoured herbivores, small, agile two- and four-legged forms, and crocodile-like aquatic reptiles. They gave rise to crocodiles, dinosaurs, and pterosaurs. The term Thecodontia is no longer used, as they are a paraphyletic group. The thecodonts are therefore an evolutionary grade of animals, rather than a clade. Most palaeontologists now use the term "basal archosaur" to refer to thecodonts. As a group, they are defined by certain shared ancestral features, such as teeth in sockets, an archosaurian characteristic that was inherited by the dinosaurs. The name thecodont is actually Latin for "socket-tooth. " Members of the group show a general trend toward a more upright, less sprawling stance, with the hindlimbs especially being progressively positioned more directly beneath the body, until some could walk upright on two legs.