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(mĕgəthēr`ēəm) [Gr.,=large beast], extinct ground sloth, of the genus Megatherium, that was widely distributed in North and South America in the Pleistocene epoch. Fossil evidence shows that these mammals became extinct comparatively recently, about the time that the first explorers reached the New World. A huge beast, the megatherium attained a length of 18 ft (5.5 m) and probably weighed several tons. The hind legs and tail were massive, the forelegs slender and supple; the animal probably supported itself much of the time in a semierect position on its hind legs and tail and used its forelegs to pull from trees the foliage on which it fed. The megatherium is classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Mammalia, order Edentata, family Megatheriidae.



a genus of fossil mammals of the order Edentata; giant ground sloths. Remains, including complete skeletons, have been found in Pleistocene deposits of North and South America. Megatherium had a massive trunk measuring up to 6 m long and short legs. It fed on leaves and young shoots, which it obtained by standing upright and, resting on its powerful tail, bending the branches with the long curved claws of its forelimbs.

References in periodicals archive ?
The case of the Megatherium of Lujan, described by Cuvier in 1796, is a very good example.
We all need a Whale hanging from the ceiling and a Megatherium marching in the halls.
In these experiments plants were either inoculated with five introduced or locally isolated Rhizobium or Bradyrhizobium strains each alone or with Bacillus megatherium var.
Plants were either inoculated with the introduced Rhizobium strain (USDA 3100) or with Bacillus megatherium var.
Plants were either inoculated with the introduced Rhizobium strain (TAL 1399) which was obtained from NifTAL project, University of Hawaii USA or with Bacillus megatherium var phosphaticum strain (BMP) which was locally isolated, in addition to combination of each (TAL 1399 + BMP).