# Hayoceros

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***Hayoceros*** is an extinct [genus](/source/Genus) of the [artiodactyl](/source/Artiodactyla) [family](/source/Family_(taxonomy)) [Antilocapridae](/source/Antilocapridae), endemic to [North America](/source/North_America) during the [Pleistocene](/source/Pleistocene) epoch (1.8 [mya](/source/Annum)—300,000 years ago), existing for about 1.5 million years.[1]

## Taxonomy

*Hayoceros* was named by Skinner (1942) and named as a subgenus of *[Tetrameryx](/source/Tetrameryx)* by Frick 1937; it was later raised to genus level. It was assigned to the Antilocapridae by Skinner (1942) and Carroll (1988).[2][3]

## Morphology

It was about 1.8 m (5.9 ft) in body length, and in most respects, resembled modern pronghorns. However, in addition to the pair of forked [horns](/source/Horn_(anatomy)) located above the eyes, as in modern pronghorns, it also possessed a second, longer and unforked, pair on the back of the [skull](/source/Skull). Most likely, males used these to fight in a fashion similar to modern pronghorns, locking horns and then pushing until the opponent gives in.[4]

## References

1. ["PaleoBiology Database: *Dinictis*, basic info"](https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=41039). [Archived](https://web.archive.org/web/20121013062018/http://paleodb.org/cgi-bin/bridge.pl?action=checkTaxonInfo&taxon_no=41039&is_real_user=1) 2012-10-13 at the Wayback Machine. Retrieved 2009-08-08.

1. M. F. Skinner. 1942. The fauna of Papago Springs Cave, Arizona, and a study of Stockeros; with three new antilocaprines from Nebraska and Arizona. Bulletin of the American Museum of Natural History 80(6):143-220

1. R. L. Carroll. 1988. Vertebrate Paleontology and Evolution. W. H. Freeman and Company, New York 1-698

1. Palmer, D. (ed.) (1999). *The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals*. London: Marshall Editions. p. 280. ISBN 1-84028-152-9.

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