synonym of Staurikosaurus pricei. Both taxa are known from single incomplete and somewhat poorly preserved specimens, therefore the former holotype specimen of "Teyuwasu" would be the second specimen ascribed to Staurikosaurus within almost 50 years of its naming. The synonymy was based on a combination of five osteological features that are only present in both specimens among Triassic early dinosauriforms: (i) femur without a trochanteric shelf; (ii) symmetric fourth trochanter of the femur; (iii) crista tibiofibularis poorly separated from the lateral condyle at the distal end of the femur; (iv) posterolateral flange of the distal end of the tibia does not exceeds the lateral margin of the bone; (v) and rounded distal end of the tibia. The synonymy is commented in two subsequent papers, which cast doubt in the association of "Teyuwasu" with Staurikosaurus. In the first paper, the authors only mention that the holotype of "Teyuwasu" is not well preserved, and thus cannot be attributed to Staurikosaurus. In the second, the authors argue that several of the five character states cited to unite the taxa are present in immature specimens of other dinosauriforms. However, the combination (that is, the simultaneous presence) of the five characters listed by Garcia et al. is not present in any of the aforementioned dinosauriforms, and therefore remains unique between "Teyuwasu" and Staurikosaurus. Therefore, further investigations are needed in order to whether confirm or not the synonymy between "Teyuwasu barberenai" and Staurikosaurus pricei. Paleobiology Feeding Staurikosaurus was a small but active bipedal predator, that preyed on small and medium-sized terrestrial vertebrates such as cynodonts, rhynchosaurs, and herbivorous synapsids. The mandible of Staurikosaurus suggests that a sliding joint in the jaw allowed it to move backwards and forwards, as well as up and down. However, some authors questioned the presence of an intramandibular joint in Staurikosaurus, due to the poor preservation of the holotype. Smaller prey could be worked backwards towards Staurikosauruss throat, aided along by its small, backwards-curving teeth. This feature was common in theropods of its time, but would disappear in later theropods. Paleoecology During the Late Triassic dinosaurs played only a minor role in terrestrial life; a fact that would change by the Early Jurassic. Staurikosaurus coexisted with large rauisuchian archosaurs like Rauisuchus, which were the top carnivores in their ecosystem Staurikosauruss paleocommunity included medium- to large-sized herbivorous rhynchosaurs and dicynodonts. Medium-sized omnivorous aetosaurs and cynodonts were also present. Dinosaurs were represented by