Trigonias

Trigonias is an extinct genus of rhinoceros from the late Eocene (Chadronian) some 35 million years ago of North America (Prothero, 2005). 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 vestigial.[4]

This article is about the extinct rhinoceros. For the bivalves, see Trigoniidae.

Trigonias
Temporal range: late Eocene[1]
T. osborni
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Mammalia
Order:
Perissodactyla
Family:
Rhinocerotidae
Genus:
†Trigonias

Lucas, 1900
Type species
†Trigonias osborni
Species[2]
  • †T. osborni
  • †T. wellsi
Synonyms
  • †Procaenopus Figgins, 1934[3]

A specimen of T. osborni was estimated to have a weight of about 391.4 kg (862.9 lbs).[5]

Notes
  1. Prothero, 2005, p. 184.
  2. Prothero, 2005, pp. 35-37.
  3. Prothero, 2005, p. 35.
  4. Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 264. ISBN 1-84028-152-9.
  5. http://paleodb.org/cgi-bin/bridge.pl?a=basicTaxonInfo&taxon_no=52444

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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