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"Lizard from La Rioja (a province of Argentina) "
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Riojasaurus was a massive quadrupedal (walked on four legs) herbivore. It was a about 30-36 feet (9-11 m) long and was heavily built. It had a long neck, a long tail, a small head, a long, bulky body, and thick, elephant-like legs with claws. The back legs were only slightly larger than the front legs. Its limb bones were solid and thick, but its backbone was hollow. It had spoon-shaped, serrated teeth.
Riojasaurus was an herbivore, a plant eater. Given its leg and ankle structure, it probably couldn't rear up on its back legs to graze or run.
Riojasaurus was a sauropodomorpha, whose intelligence (as measured by its relative brain to body weight, or EQ) was the lowest among the dinosaurs.
Riojasaurus was a Saurischian dinosaur, the order of lizard-hipped dinosaurs. It was a sauropodomorph (large, long-necked herbivores) and perhaps a melanorosaurid (the largest prosauropods; quadrupedal, thick-limbed herbivores). The type species is R. incertus (Bonaparte, 1969).
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