Notiotitanops is a brontothere 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 Eocene

Eocene

The Eocene Epoch, lasting from about 56 to 34 million years ago , is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era. The Eocene spans the time from the end of the Palaeocene Epoch to the beginning of the Oligocene Epoch. The start of the...

 living from 48.6—37.2 mya, existing for approximately .

Taxonomy

Notiotitanops was named by Gazin and Sullivan (1942). Its type is Notiotitanops mississippiensis. It was assigned to Titanotheriidae by Gazin and Sullivan (1942); and to Brontotheriidae

Brontotheriidae

Brontotheriidae, also called Titanotheriidae, is a family of extinct mammals belonging to the order Perissodactyla, the order that includes horses, rhinoceroses, and tapirs. Superficially they looked rather like rhinos, although they were not true rhinos and are probably most closely related to...

by Mader (1998).

Morphology

Two specimens were examined by M. Mendoza for body mass The first specimen was estimated to have a weight of 167.1 kg (368.4 lb). The second was estimated to have a weight of 617 kg (1,360.3 lb).