Apatosaurus was a herbivore. It lived in the Jurassic period and inhabited North America. Its fossils have been found in places such as Utah, Texas and South Dakota.
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Apatosaurus was a sauropod that lived during the late Jurassic period. Like most sauropods, it was an herbivore that moved about on four legs, with a long craning neck and protruding tail for balance. It is believed that Apatosaurus held its head upright for grazing, more like Brachiosaurus, and not cast forward like Diplodocus.
For a long time, people used the term Brontosaurus to refer to the Apatosaurus, due to a long feud between the paleontologist-adventurers Cope and Marsh. Eventually it was decided that Marsh’s discovery took precedence, and that Apatosaurus was indeed the correct name for the genus. However, in 2015 it was resolved that Brontosaurus was a legitimate genus of its own!
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Apatosaurus, (genus Apatosaurus), genus of at least two species of giant herbivorous sauropod dinosaurs that lived between about 156 million and 151 million years ago, during the late Jurassic Period. Its fossil remains are found in North America and Europe. Although the genus has subsumed Brontosaurus formally since 1903, a body of evidence suggests that Apatosaurus and Brontosaurus should be classified as separate genera.
Apatosaurus, which is considered to be one of the largest land animals of all time, weighed as much as 41 tonnes (roughly 45 tons) and measured up to 23 metres (about 75 feet) long, including its long neck and tail. It had four massive and pillarlike legs, and its tail was extremely long and whiplike. Although some scientists have suggested that the tail could have been cracked supersonically like a bullwhip, this is unlikely, as damage to the vertebrae would have been a more probable result.
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The size, shape, and features of the Apatosaurus head were disputed for more than a century after its remains were first uncovered. Certainty was clouded in part by incomplete fossil finds and by a suspected mix-up of the first fossils during shipment from an excavation site. The head was originally and mistakenly represented in models like that of a camarasaurid, with a square, snubnosed skull and spoonlike teeth. In 1978, however, scientists rediscovered a long-lost skull in the basement of the Carnegie Museum in Pittsburgh, Pennsylvania. This was the skull that actually belonged to an Apatosaurus skeleton; it was slender and elongated and contained long peglike teeth, like those of a diplodocid. Henceforth, Apatosaurus skull models in museums around the world were changed accordingly.
Much discussion has centred on whether Apatosaurus and related forms were able to support their great bulk on the land or were forced to adopt aquatic habits. Many lines of evidence, including skeletal structure and footprints, show that Apatosaurus and all sauropods were terrestrial, like elephants. No skeletal features are indicative of an aquatic existence, and analyses suggest that the dinosaur’s bones could easily have supported its great weight. Footprints show that the toes were covered in horny pads like those of elephants. Furthermore, the ribcage was heart-shaped in cross-section like those of elephants, not barrel-shaped like that of the amphibious hippopotamus. Even the massive Brachiosaurus, which weighed about 80 tonnes (roughly 88 tons), was probably more often on land than in the water.
Apatosaurus was first described by American paleontologist O.C. Marsh in 1877. Two years later he described another sauropod, Brontosaurus. American paleontologist Elmer Riggs in 1903 ascribed the differences between the two genera to growth and deemed Apatosaurus to be a young Brontosaurus. Since Apatosaurus had been described first, that became the species name. The change took some time to become accepted in museums—and much longer in popular culture—but by the 1970s Apatosaurus had supplanted Brontosaurus. However, in 2015 the classification question was reopened when an analysis of 81 sauropod skeletons claimed that the specimens that had been labeled Brontosaurus were a genus distinct from Apatosaurus.
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