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Temporal range: 35–5 Ma
Late Eocene[1]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Suborder: Tylopoda
Family: Merycoidodontidae
Genus: Aclistomycter
  • A. middletoni

Aclistomycter is an extinct genus of oreodont during the early Chadronian subepoch (42—39.9 mya) existing for approximately 2.1 million years.[2]

Aclistomycter was a very small herbivorous artiodactyl with a short face, small, but tusk-like canine teeth, heavy body, and long tail, short feet.


Aclistomycter was named and assigned to Merycoidodontidae by Wilson (1971) and Lander (1998)[3][4]


A single specimen was examined by M. Mendoza for body mass and estimated to have a weight of 87.9 kg (193.7 lbs). [5]


  1. ^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 270. ISBN 1-84028-152-9. 
  2. ^ PaleoBiology Database: Aclistomycter, basic info
  3. ^ J. A. Wilson. 1971. Early Tertiary vertebrate faunas, Vieja Group. Trans-Pecos Texas: Agriochoeridae and Merycoidodontidae. Texas Memorial Museum Bulletin
  4. ^ B. Lander. 1998. Oreodontoidea. In C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary mammals of North America 402-425
  5. ^ 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