Biostratigraphic significance of a new early sauropodomorph specimen from the Upper Triassic of southern Brazil

摘要: AbstractThe Wachholz site (Caturrita Formation, Late Triassic), in Agudo, Rio Grande do Sul (RS), southern Brazil, has yielded several sauropodomorphs. This includes CAPPA/UFSM 0002, described here based on associated elements from the basalmost portion of site. The specimen possesses a set traits shared with typical ‘prosauropods’: concave caudal margin trunk neural spines and broadly convex proximal end metacarpal V. However, it also retains some plesiomorphic features, for instance, slender pedal digit I. Some bones closely resemble those Unaysaurus tolentinoi, other definitive sauropodomorph Caturrita an affinity corroborated by new phylogenetic analysis. An updated biostratigraphic framework correlates Wachholz, Agua Negra (Sao Martinho da Serra/RS) Botucarai Hill (Candelaria/RS) sites their sample In addition, record Jachaleria site, dicynodont known early Norian deposi...