Castor_californicus
Castor californicus
Species of mammal (fossil)
Castor californicus is an extinct species of beaver that lived in western North America from the end of the Miocene to the early Pleistocene.[2] Castor californicus was first discovered in Kettleman Hills in California, United States. The species was similar to but larger than the extant North American beaver, C. canadensis.[4]
Unlike other members of the Castor genus, the Castor californicus has a total of three enamel folds, the folds of the internal enamel epithelium.[5]