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Pliometanastes
''Pliometanastes'' is an extinct genus of giant ground sloths of the family Megalonychidae endemic to North America during the Miocene epoch through very early Pliocene epoch. Its fossils have been found across the southern U. S. from California to Florida.
''Pliometanastes'' and ''Thinobadistes'' were the first of the giant sloths to appear in N. America. Both were in N. America before the Panamanian Land Bridge formed around 2.5 million years ago. It is then reasonable to presume that the ancestors of ''Pliometanastes'' island-hopped across the Central American Seaway from South America, where ground sloths arose.〔(Tetrapod Zoology ), Scienceblogs, Ten things you didn't know about sloths, by Darien Naish, University of Portsmouth January 23, 2007.〕
''Pliometanastes'' gave rise to ''Megalonyx''. Their closest extant relatives are the two-toed arboreal sloths (''Choloepus'').
==Taxonomy==
''Pliometanastes'' was named by Hirschfeld and Webb (1968). Its type is ''Pliometanastes protistus''. It was assigned to Megalonychidae by Hirschfeld and Webb (1968) and Carroll (1988).〔S. E. Hirschfeld and S. D. Webb. 1968. Bulletin of the Florida State Museum 12(5)〕〔R. L. Carroll. 1988. Vertebrate Paleontology and Evolution. W. H. Freeman and Company, New York 1-698〕
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