South America's Adeopapposaurus is very similar to South Africa's Massospondylus and when its remains were first described in 1999 that's exactly where they were assigned.∝ A decade later Ricardo Martínez revisited its fossils and noticed things he hadn't before, like weird features of the jaw and an extra neck vertebrae, and realised he had a new dinosaur on his hands. New features or not, it's still closely related to Massospondylus and therefore a member of Massospondylidae—a family of basal sauropodomorphs (aka prosauropods) that paleontologists had long suspected of omnivory or even carnivory.
Scrutiny of its snout-end revealed an "overbite", meaning its lower jaw was shorter than its upper jaw, and it sported a series of bony ridges and hollows which could be interpreted as anchor points for fleshy lips if dinosaurs were well endowed in the facial muscle department. But we don't know if they were. Overbites are not uncommon in the animal kingdom, especially among birds of prey whose upper jaw is tipped with a hook-over beak that wont allow the lower jaw to extend further. So its likely that the snout of Adeopapposaurus anchored a beak too, but it was wide and bill-like for snipping vegetation rather than sharp and pointy for tearing at flesh.
The holotype (PVSJ610) includes most of a skeleton from the hips up, including a skull.