File:Pseudodiplacodon progressum.jpg

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English: Pseudodiplacodon progressum (Peterson, 1934) - fossil brontothere skeleton from the Eocene of Utah, USA. (CM 11879, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA)

Formerly known as Diplacodon progressum.

This is the holotype specimen of Pseudodiplacodon progressum. This species is a brontothere (a.k.a. titanothere), an extinct group of moderately large, rhinoceros-like mammals. Many brontotheres had nasal horns - this feature was sexually dimorphic (present in males, absent in females).

From museum signage: "[Pseudodiplacodon] had two distinctive nasal horns. This huge titanothere was one of the earliest to develop horns, a characteristic shared by later animals of the family."

Classification: Animalia, Chordata, Vertebrata, Mammalia, Perissodactyla, Brontotheriidae

Stratigraphy: lower Myton Member, Uinta Formation, Uintan Stage, Lower Eocene

Locality: Skull Pass Quarry, ~7 miles north of the town of Ouray, Uintah County, northeastern Utah, USA


Some info. from: Mader (2000) - Pseudodiplacodon, a new generic name for Diplacodon progressum Peterson (Mammalia, Perissodactyla, Brontotheriidae). Journal of Vertebrate Paleontology 20: 164-166.


See info. at:

en.wikipedia.org/wiki/Brontotheriidae
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Source https://www.flickr.com/photos/jsjgeology/33097734656/
Author James St. John

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