Classification of Storer 2004

G. Sorex Linnaeus 1758 [long-tailed shrew]
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Sorex cinereus Kerr 1792 [cinereus shrew]
G. Eutamias Trouessart 1880 [chipmunk]
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Eutamias minimus Bachman 1839 [least chipmunk]
G. Spermophilus Cuvier 1825 [ground squirrel]
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Spermophilus parryii Richardson 1825 [arctic ground squirrel]
G. †Guildayomys Zakrzewski 1984
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†Guildayomys matthewsi Storer 2004
G. Microtus Schrank 1798 [vole]
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†Microtus deceitensis Guthrie and Matthews, Jr. 1971
†Microtus morlani Storer 2004
G. Ochotona Link 1795 [pika]
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†Ochotona whartoni Guthrie and Matthews, Jr. 1971
G. Equus Linnaeus 1758 [horse]
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†Equus lambei Hay 1917