Description
English: Megalonyx jeffersonii skeleton cast produced and distributed by Triebold Paleontology Incorporated
Date 9 August 2013
Author MCDinosaurhunter
Source: https://commons.wikimedia.org/wiki/File:Megalonyx_Clean.png

Megalonyx (Greek, "large claw") is an extinct genus of ground sloths of the family Megalonychidae endemic to North America from the Hemphillian of the Late Miocene through to the Rancholabrean of the Pleistocene, living from ~10.3 Mya—11,000 years ago, existing for approximately 10.289 million years. Type species, M. jeffersonii, measured about 3 m and weighed up to 1,000 kilograms. Superorder: Xenarthra, Order: Pilosa, Family: Megalonychidae, Subfamily: Megalonychinae, Genus: Megalonyx
Species:
M. matthisi Hirschfeld & Webb, 1963
M. wheatleyi Cope, 1871
M. leptostomus Cope, 1893
M. jeffersonii Desmarest, 1822