 South American aetosaurs have been found from Argentina , Brazil , and Chile . In Argentina , they are known from the Carnian Ischigualasto Formation . Common genera from Ischigualasto include Aetosauroides and Stagonolepis . In Brazil , fossils have been found in the Santa Maria and <unk> Formations in Rio Grande do Sul ( <unk> ) . Chilean aetosaurs are represented by one genus , <unk> , from the Antofagasta Region . Aetosaurs have also been found from India , which , along with South America , was part of Gondwana during the Late Triassic . Early descriptions of aetosaurs included material from the Maleri Formation in south @-@ central India , although it was too inadequate to assign specimens to any particular genus . Based on such descriptions , the Indian aetosaurs most closely resemble Longosuchus and Paratypothorax . Reports of aetosaurs from Madagascar are based on probable <unk> scutes . 
