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Concept
Megatherium
Summary
Megatherium (mɛɡəˈθɪəriəm ; from Greek méga (μέγα) 'great' + theríon (θηρίον) 'beast') is an extinct genus of ground sloths endemic to South America that lived from the Early Pliocene through the end of the Pleistocene. It is best known for the elephant-sized type species M. americanum, sometimes called the giant ground sloth, or the megathere, native to the Pampas through southern Bolivia during the Pleistocene. Various other smaller species belonging to the subgenus Pseudomegatherium are known from the Andes.
Megatherium is part of the sloth family Megatheriidae, which also includes the similarly giant Eremotherium, comparable in size to M. americanum, which was native to tropical South America, Central America and North America as far north as the southern United States. Only a few other land mammals equaled or exceeded M. americanum in size, such as large proboscideans (e.g., elephants) and the giant rhinoceros Paraceratherium. Megatherium was first discovered in 1788 on the bank of the Luján River in Argentina. The holotype specimen was then shipped to Spain the following year wherein it caught the attention of the paleontologist Georges Cuvier, who was the first to determine, by means of comparative anatomy, that Megatherium was a sloth. Megatherium became extinct around 12,000 years ago during the Quaternary extinction event, which also claimed most other large mammals in the New World. The extinction coincides with the settlement of the Americas, and one and potentially multiple kill sites where M. americanum was slaughtered and butchered is known, suggesting that hunting could have caused its extinction.
Megatherium americanum was one of the largest animals in its habitat, weighing up to , with a shoulder height of and length of from head to tail. It was one of the largest ground sloths, about as big as modern Asian elephants. Megatherium species were members of the abundant Pleistocene megafauna, large mammals that lived during the Pleistocene epoch.
Megatherium had a robust skeleton with a large pelvic girdle and a broad muscular tail.
Official source
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