''Eucastor'' is an extinct

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of beaver-grouped

rodent Rodents (from Latin , 'to gnaw') are mammals of the Order (biology), order Rodentia ( ), which are characterized by a single pair of continuously growing incisors in each of the upper and Mandible, lower jaws. About 40% of all mammal specie ...

s. Based on the available evidence of the foramina, ''Eucastor'' most likely is closely related to ''Castor'', but not in its direct lineage. It has two species, the type ''Eucastor'' (formerly ''Castor'') ''tortus'', and ''E. malheurensis'' Eucastor tortus skull

References

* McKenna, Malcolm C., and Bell, Susan K. 1997. ''Classification of Mammals Above the Species Level''. Columbia University Press, New York, 631 pp. Prehistoric beavers Prehistoric rodent genera Taxa named by Joseph Leidy {{paleo-rodent-stub