| Hemiacodon Temporal range:
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|---|---|
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| Upper jaw of H.gracilis | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Infraclass: | Placentalia |
| Order: | Primates |
| Family: | †Omomyidae |
| Genus: | †Hemiacodon Marsh, 1872 |
| Species | |
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Hemiacodon is a genus of early Eocene omomyid from North America.1
Description
Hemiacodon is known from mainly dentary material, and the various species are differentiated by the shape and development of shearing crests on the molar. This variation in molar shape indicates the different species had varied diets.2
Paleoecology
Hemiacodon lived alongside many other primates in western North America, including Pelycodus, Notharctus and Macrotarsius.2 Older literature speculates that the diversity of primates in early Eocene California was caused by them being temporary "safe havens", meaning the environment was more accommodating than surrounding areas.3
References
References
- "Mindat.org". www.mindat.org. Retrieved 2025-09-17.
- Murphey, Paul C.; Dunn, Rachel H. (August 2009). "Hemiacodon engardae, a new species of omomyid primate from the earliest Uintan Turtle Bluff Member of the Bridger Formation, southwestern Wyoming, USA". Journal of Human Evolution. 57 (2): 123–130. Bibcode:2009JHumE..57..123M. doi:10.1016/j.jhevol.2009.05.006. ISSN 1095-8606. PMID 19625072.
- Lillegraven, Jason A. (1980). "Primates from Later Eocene Rocks of Southern California". Journal of Mammalogy. 61 (2): 181–204. doi:10.2307/1380040. ISSN 0022-2372. JSTOR 1380040.