Castor californicus
| Castor californicus Temporal range: late Miocene to early Pleistocene | |
|---|---|
| Scientific classification | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Chordata | 
| Class: | Mammalia | 
| Order: | Rodentia | 
| Family: | Castoridae | 
| Genus: | Castor | 
| Species: | †C. californicus | 
| Binomial name | |
| †Castor californicus Kellogg, 1911 | |
| Sites of C. californicus finds | |
| Synonyms | |
| †Castor accessor Hay, 1927 | |
Castor californicus is an extinct species of beaver that lived in western North America from the end of the Miocene to the early Pleistocene. Castor californicus was first discovered in the Kettleman Hills of California, United States. The species was similar to but larger than the extant North American beaver, C. canadensis.
Unlike other members of the Castor genus, Castor californicus possessed a total of three enamel folds, the folds of the internal enamel epithelium.