Classification of Helgen et al. 2009

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G. Ammospermophilus Merriam 1892 [antelope squirrel]
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Callospermophilus lateralis Say 1823 [golden-mantled ground squirrel]
G. Cynomys Rafinesque 1817 [prairie dog]
G. Ictidomys Allen 1877 [lined ground squirrels]
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Ictidomys mexicanus Erxleben 1877
Ictidomys tridecemlineatus Mitchell 1821 [thirteen-lined ground squirrel]
G. Marmota Frisch 1775 [marmot]
G. Notocitellus Howell 1938
G. Otospermophilus Brandt 1844
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Otospermophilus beecheyi Richardson 1823 [California ground squirrel]
Otospermophilus variegatus Erxleben 1777 [rock squirrel]
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Otospermophilus variegatus grammurus Helgen et al. 2009 [rock squirrel]
G. Poliocitellus Howell 1938 [Franklin's gruond squirrel]
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G. Spermophilus Cuvier 1825 [ground squirrel]
G. Urocitellus Obolenskij 1927 [Holarctic ground squirrel]
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Urocitellus elegans Kennicott 1863 [Wyoming ground squirrel]
Urocitellus parryii Richardson 1825 [arctic ground squirrel]
Urocitellus townsendii Bachman 1839 [Townsend's ground squirrel]
Invalid names: Anisonyx Rafinesque 1817 [replaced]
G. Xerospermophilus Merriam 1892 [pygmy ground squirrel]