Bonaparte’s (1999) description of the Early Cretaceous sauropod Agustinia ligabuie was notable for its identification of nine bony fragments as representing dermal armour, which he classified into Types 1–4. Here are some examples: Consequently, Augustinia was for many years restored as uniquely spiky, a sort of “stegosaur sauropod”: But Bellardini and Cerda (2017) showed that […]