Temporal range: late Eocene
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).
- Prothero, 2005, p. 184.
- Prothero, 2005, pp. 35-37.
- Prothero, 2005, p. 35.
- Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 264. ISBN 1-84028-152-9.
- 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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