Named for the La Amarga geographic formation in Argentina, Amargasaurus is known from an almost entirely complete skeleton that showcases its most distinct feature – two rows of large spines along the back of its neck.
Amargasaurus was small for a sauropod, measuring only about 33 feet long. The function of its spines isn’t known, though it may have been used the same way modern day antelopes use their horns (to ward off predators who try to attack by leaping onto their backs).
Amargasaurus is known from a single, nearly complete skeleton discovered in 1984 by Guillermo Rougier. The only significant piece missing from this specimen was most of the skull. However, based on similar related sauropods with known skull material, paleontologists are able to agree with some certainty with regards to the basic look of Amargasaurus’s head.
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