Bison occidentalis

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Bison occidentalis
Temporal range: Pleistocene-Holocene
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Class: Mammalia
Order: Artiodactyla
Family: Bovidae
Subfamily: Bovinae
Genus: Bison
Species: B. occidentalis
Binomial name
Bison occidentalis
Lucas, 1898 [1]

Bison occidentalis is an extinct species of bison that lived in North America from about 11,000 to 5,000 years ago, spanning the end of the Pleistocene to the mid-Holocene.[2] Likely evolving from Bison antiquus, B. occidentalis was smaller overall from its ancestor and other species such as the steppe bison. B. occidentalis had a highly variable morphology, and their horns, which pointed rearward, were much thinner and pointed than Pleistocene species of bison.[2] Around 5,000 years ago, B. occidentalis was replaced by today's smaller Bison bison.

B. occidentalis may have declined in numbers because of competition with other grass eaters of the megafauna epoch.[3] More recently ancient DNA studies have proven interbreeding between B. occidentalis and ancestral modern bisons, so B. occidentalis was proposed to have been a localized offshoot of B. antiquus and part of the transition from that chronospecies to modern bisons.

See also[edit]


  1. ^ Stephen Austin Hall (1972). "Holocene Bison occidentalis from Iowa". Journal of Mammalogy. 53 (3): 604–606. JSTOR 1379052. 
  2. ^ a b McDonald, J. N. (1981). North American bison: their classification and evolution. Berkeley: University of California Press. ISBN 0520040023. 
  3. ^ Lott, Dale F. (2002). American Bison: A Natural History. Berkeley: University of California Press. ISBN 0-520-23338-7.