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Riojasaurus (meaning "Rioja lizard") was a prosauropod plant-eating dinosaur named after La Rioja Province in Argentina where it was found by José Bonaparte. It lived during the Late Triassic. It grew to about 11 metres long, had a heavy body, bulky legs and a long neck and tail. It probably moved slowly on all fours and was unable to rear up on its back legs[citation needed]. Experts think that Riojasaurus probably travelled in herds for protection[citation needed]. Unlike smaller prosauropods such as Plateosaurus, Riojasaurus could not rear up on its hind legs[citation needed]. No skull was found with the first skeleton of Riojasaurus, but its long slender neck suggests that its head was quite small. Riojasaurus is the only known melanosaurid to live in South America.
Size comparison chart of Riojasaurus.
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