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Temporal range: Eocene
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Protoceratidae
Genus: Poabromylus
Peterson, 1931
  • P. golzi
  • P. kayi
  • P. robustus
Poabromylus range.png
Range of Poabromylus based on fossil record

Poabromylus is a small extinct genus of Artiodactyla, of the family Protoceratidae, endemic to North America from the Eocene epoch (Uintan to Chadronian stage) 46.2—33.9 Ma, existing for approximately 12.3 million years.[1]


Poabromylus was named by Peterson (1931). Its type is Poabromylus kayi. It was assigned to Protoceratidae by Peterson (1931), Carroll (1988), Prothero (1998) and Prothero and Ludtke (2007).[2][3][4][5]


Poabromylus resembled deer. However they were more closely related to camelids. In addition to having horns in the more usual place, protoceratids had additional, rostral horns above the orbital cavity.

Body mass[edit]

Three fossil specimens of Poabromylus were measured by M. Mendoza, C. M. Janis, and P. Palmqvist for body mass.[6] The specimens were determined to weigh:

  • Specimen 1: 19.6 kg (43 lb)
  • Specimen 2: 25.9 kg (57 lb)
  • Specimen 3: 12.8 kg (28 lb)

Fossil distribution[edit]

Fossils have been recovered from:


  1. ^ PaleoBiology Database: Poabromylus, basic info
  2. ^ O. A. Peterson. 1931. Annals of Carnegie Museum 21(2):61-78
  3. ^ O. A. Peterson. 1919. Annals of Carnegie Museum 12(2)
  4. ^ R. L. Carroll. 1988. Vertebrate Paleontology and Evolution. W. H. Freeman and Company, New York 1-698
  5. ^ D. R. Prothero and J. A. Ludtke. 2007. Family Protoceratidae. in D. R. Prothero and S. Foss (eds.), The Evolution of Artiodactyls 169-176
  6. ^ 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