(8.9 ft), as evidenced by the anatomy of its neck and inner ear. Probably fed above ground level at heights of up to 2.7 meters Titanosauriforms showed proportionally longer necks, longer forelimbs,Īnd broader tooth crowns than Dicraeosaurids and Rebbachisaurids, The high diversity suggests that different sauropod species exploitedĭifferent food sources in order to reduce competition. The sauropod fauna of the La Amarga Formation was diverse and included the basal rebbachisaurid Zapalasaurus, the dicraeosaurid Amargatitanis, and unnamed remains of basal titanosauriforms. The Amargasaurus skeleton itself was recovered from a layer composed of sandy conglomerates. In thickness and mainly composed of sandstones deposited by braided rivers. This member is approximately 29 meters (95 ft) Have been found in the lowermost (oldest) part of the formation, the Most vertebrate fossils, including Amargasaurus, Within the Sauropoda, Amargasaurus is classified as a member of the family Dicraeosauridae, which differs from other sauropods in showing shorter necks and smaller body sizes.Īmargasaurus stems from sedimentary rocks of the La Amarga Formation, which is part of the Neuquén Basin and dates to the Barremian and late Aptian of the Early Cretaceous. Position of the snout 80 centimeters (31 inches) above the ground and a Amargasaurus probably fed at mid-height, as shown by the orientation of its inner earĪnd the articulation of its neck vertebrae, which suggest a habitual Which might have exploited different food sources in order to reduceĬompetition. It shared its environment with at least three other sauropod genera, They might have been used for display, combat, or defense.Īmargasaurus was discovered in sedimentary rocks of the La Amarga Formation, which dates back to the Barremian and late Aptian stages of the Early Cretaceous. An alternate hypothesis, now less favored, postulates that they could have formed a scaffold supporting a skin sail. Out of the body as solitary structures that supported a keratinous sheath. In life, these spines most likely could have stuck Parallel rows of tall spines down its neck and back, taller than in any It was a large animal, but small for a sauropod, reaching 9 to 10 Amargasaurus was first described in 1991 and contains a single known species, Amargasaurus cazaui. The only known skeleton was discovered in 1984 and is virtually complete, including a fragmentary skull, making Amargasaurus one of the best-known sauropods of its epoch. Amargasaurus is a genus of sauropod dinosaur from the Early Cretaceous epoch (129.4–122.46 mya) of what is now Argentina.
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