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Trigonias
''Trigonias'' is an extinct genus of rhinoceros from the late Eocene (Chadronian) some 35 million years ago of North America (Prothero, 2005). It is the oldest rhino of which a well-preserved skeleton has been found. ''Trigonias'' was about 2.1 m (7 ft) long and, despite lacking horns, looked a lot like modern rhinos. Its front legs had five toes (as contrasted with three in modern rhinos), the fifth of which was vestigal. A specimen of ''T. osborni'' was estimated to have a weight of about 391.4 kg (862.9 lbs).〔http://paleodb.org/cgi-bin/bridge.pl?a=basicTaxonInfo&taxon_no=52444〕 ==Notes==
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