Trigonias

Taxobox
name = "Trigonias"
fossil_range = late EoceneProthero, 2005, p. 184.]

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image_width = 250px
image_caption = "Trigonias" skeleton.
regnum = Animalia
phylum = Chordata
classis = Mammalia
ordo = Perissodactyla
familia = Rhinocerotidae
genus = †"Trigonias"
genus_authority = Lucas, 1900
type_species = †"Trigonias osborni"
subdivision_ranks = SpeciesProthero, 2005, pp. 35-37.]
subdivision =
* †"T. osborni"
* †"T. wellsi"
synonyms =
* †"Procaenopus" Figgins, 1934Prothero, 2005, p. 35.]

"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

References

*Prothero, Donald R. 2005. "The Evolution of North American Rhinoceroses." Cambridge University Press, Cambridge, 218 pp. ISBN 0-521-83240-3