Puertasaurus is a genus of titanosaurid sauropod that appeared during the Late Cretaceous, 70 million years ago. It lived in what is now Patagonia. The type species is Puertasaurus reuili.
The neck had a huge vertical range of flexibility, and it may have been able to bend over backwards so that Puertasaurus could reach higher branches behind its head.
Puertasaurus was up to 40 meters (131 ft) long and weighed between 80 and 100 tons.