Mesatirhinus
Encyclopedia
Mesatirhinus is a genus of 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 50.3—42 mya, existing for approximately .

Taxonomy

Mesatirhinus was named by Osborn (1908). It is not extant. It was assigned 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 Osborn (1908) and Carroll (1988); and to Dolichorhininae by Mader (1998).
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