Classification of the species Megatherium jeffersonii
†Megalonyx jeffersonii Desmarest 1822 [Jefferson's ground sloth]
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Invalid names: Megalonyx brachycephalus Sellards 1941 [synonym], Megalonyx californicus Stock 1913 [synonym], Megalonyx hogani Stovall 1940 [synonym], Megalonyx laqueatus Harlan 1831 [synonym], Megalonyx milleri Lyon 1938 [synonym]