Revision of Amygdalodon patagonicus Cabrera, 1947 (Dinosauria, Sauropoda)

The type material of the oldest known sauropod dinosaur from South America, Amygdalodon patagonicus , from the Cerro Carnerero Formation (Toarcian‐Bajocian) of Chubut province. Argentina, is reviewed. The material includes elements of at least two individuals plus a remain of another, indeterminate vertebrate, and a posterior dorsal vertebra is designated as the lectotype of Amygdalodon. All of the sauropod material originally referred to this species represents very basal, non‐neosauropodan eusauropods. Amygdalodon is the only South American evidence for a probable Early to early Middle Jurassic global dispersal of basal eusauropodan sauropods.