This article is about the extinct rhinoceros. For the bivalves, see Trigoniidae. Trigonias is an extinct genus of rhinoceros from the late Eocene (Chadronian) some 35 milion years ago of North America (Prothero, 2005).
It is the oldest rhino of which a well-preserved skeleton has been found. Trigonias was about 2.5 m (8 ft 2 in) 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.
Notes
- ^ Prothero, 2005, p. 184.
- ^ Prothero, 2005, pp. 35-37.
- ^ Prothero, 2005, p. 35.
References
- Prothero, Donald R. 2005. The Evolution of North American Rhinoceroses. Cambridge University Press, Cambridge, 218 pp. ISBN 0-521-83240-3
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