ground slothn. one of an extinct group of New World herbivorous mammals of the group Edentata, intermediate between the existing sloths and ant-eaters.
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the world > animals > mammals > order Edentata > [noun] > family Bradypodidae (sloth) > extinct sloths
sloth1791
Megalonyx1796
gravigrade1847
ground sloth1860
1860 R. Owen (title) Memoir on the Megatherium, or Giant Ground-Sloth of America.
1896 B.M. Guide Fossil Mammals 69 The entire skeleton of the great extinct ‘Ground Sloth’.