Peraceras is an extinct genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of rhinoceros

Rhinoceros

Rhinoceros , also known as rhino, is a group of five extant species of odd-toed ungulates in the family Rhinocerotidae. Two of these species are native to Africa and three to southern Asia....

 endemic to North America

North America

North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

 during the Miocene

Miocene

The Miocene is a geological epoch of the Neogene Period and extends from about . The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words and and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene...

, living from 20.6—10.3 mya and existing for approximately .

Taxonomy

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

Aceratheriinae

Aceratheriinae is an extinct subfamily of rhinoceros endemic to Asia, Africa, Europe, and North America during the Oligocene through Pliocene living from 33.9—3.4 mya, existing for approximately .It consists of 6 genera:...

 by Prothero (1998).

Morphology

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:

• Specimen 1: 98.7 kg (217.6 lb)
• Specimen 2: 315.7 kg (696 lb)
• Specimen 3: 408.6 kg (900.8 lb)
• Specimen 4: 121.7 kg (268.3 lb)