Rinconsaurus is a genus of sauropod dinosaur from the Late Cretaceous Period. It lived in what is now Argentina. It was discovered in 1997 in the Neuquen province of Argentina. It was described by Calvo and Riga in 2003, based on three incomplete skeletons that included the vertebrae, limbs, scapula, hips, and several ribs. Some cranial fragments and a few teeth have also been found. The type species is R. caudamirus. The genus was named for the location of the discovery: Rincón de los Sauces. The specific name, caudamirus, means “amazing tail”, in reference to its unusual vertebrae shape of the tail.

Rinconsaurus was a large long-necked quadrupedal dinosaur. It also had a long, whip-like tail. Its legs were huge and pillar-like. It was a slender beast for a sauropod. It is estimated that this dinosaur was about 36 feet in length and stood 8 feet high at the shoulder. Based on a single partial skull discovered, it is believed that Rinconsaurus had a long, narrow head.

Rinconsaurus was a herbivorous dinosaur. Based on dung that was found fossilized along with the remains of Rinconsaurus, diet most likely consisted of conifers, cycads, palms and even grasses. It thrived on the ancestors of common rice and bamboo. Some scientists speculate that grasses and herbivorous dinosaurs co-evolved. Foliage was stripped from the trees with its chisel-like teeth and sharp facets.

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