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Temporal range: Miocene
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Perissodactyla
Family: Rhinocerotidae
Subfamily: Aceratheriinae
Genus: Peraceras
Cope, 1880

Peraceras is an extinct genus of rhinoceros endemic to North America during the Miocene, living from 20.6—10.3 mya and existing for approximately 10.3 million years.[1]


Peraceras was named by Cope (1880). Its type is Peraceras superciliosum. It was assigned to Rhinocerotidae by Cope (1880) and Carroll (1988); and to Aceratheriinae by Prothero (1998).[2][3]


Four specimens were examined by M. Mendoza, C. M. Janis, and P. Palmqvist as well as M. Fortelius and J. Kappelman for estimated body mass with the results as follows:[4][5]

  • Specimen 1: 98.7 kg (220 lb)
  • Specimen 2: 315.7 kg (700 lb)
  • Specimen 3: 408.6 kg (900 lb)
  • Specimen 4: 121.7 kg (270 lb)


  1. ^ PaleoBiology Database: Peraceras, basic info
  2. ^ R. L. Carroll. 1988. Vertebrate Paleontology and Evolution. W.H. Freeman and Company
  3. ^ D. R. Prothero. 1998. Rhinocerotidae. in C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary mammals of North America 595-605
  4. ^ M. Mendoza, C. M. Janis, and P. Palmqvist. 2006. Estimating the body mass of extinct ungulates: a study on the use of multiple regression. Journal of Zoology 270(1):90-101
  5. ^ M. Fortelius and J. Kappelman. 1993. The largest land mammal ever imagined. Zoological Journal of the Linnean Society 108(1):85-101 Interscience