|It has been suggested that Castoroides ohioensis and Castoroides leiseyorum be merged into this article or section. (Discuss) Proposed since April 2010.|
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- Castoroides leiseyorum (found in Florida only)
- Castoroides ohioensis, synonym Castoroides nebrascensis (found throughout continental United States and Canada)
Either species grew over 8 feet in length, easily dwarfing all other known beaver species, including the modern species.
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