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Genus Petaurista
- very large Asiatic flying squirrels
Genus Castor
- type genus of the Castoridae: beavers
Genus Castoroides
- extinct beavers of the Pleistocene; of eastern and southern United States
Genus Aplodontia
- type genus of the Aplodontiidae: comprising the mountain beavers
Genus Cavia
- type genus of the Caviidae: guinea pigs
Genus Hydrochoerus
- a genus of Hydrochoeridae
Genus Dasyprocta
- type genus of the Dasyproctidae: agoutis