Classification of Black 1963
Fm. Sciuridae Gray 1821 [squirrel]
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G. †Miospermophilus Black 1963
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†Miospermophilus bryanti Wilson 1960
†Miospermophilus wyomingensis Black 1963
G. †Protosciurus Black 1963
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†Protosciurus condoni Black 1963
†Protosciurus mengi Black 1963
†Protosciurus rachelae Black 1963
†Protosciurus tecuyensis Bryant 1945
G. Ammospermophilus Merriam 1892 [antelope squirrel]
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†Ammospermophilus junturensis Shotwell and Russell 1963
G. Marmota Frisch 1775 [marmot]
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†Marmota minor Kellogg 1910
†Marmota nevadensis Kellogg 1910
†Marmota vetus Marsh 1871
G. †Protospermophilus Gazin 1930
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†Protospermophilus angusticeps Matthew 1933
†Protospermophilus kelloggi Black 1963
†Protospermophilus malheurensis Gazin 1932
†Protospermophilus oregonensis Downs 1956
†Protospermophilus quatalensis Gazin 1930
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Invalid names: Sciurus venturus Bryant 1945 [synonym]
†Protospermophilus vortmani Cope 1879
G. †Citellus Oken 1816
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†Citellus argonautus Stirton and Goeriz 1942
†Citellus bensoni Gidley 1922
†Citellus cochisei Gidley 1922
†Citellus cragini Hibbard 1941
†Citellus dotti Hibbard 1954
†Citellus fricki Hibbard 1942
†Citellus gidleyi Merriam et al. 1925
†Citellus howelli Hibbard 1941
†Citellus matachicensis Wilson 1949
†Citellus matthewi Black 1963
†Citellus mckayensis Shotwell 1956
†Citellus meadensis Hibbard 1941
†Citellus pattersoni Wilson 1949
†Citellus primitivus Bryant 1945
†Citellus shotwelli Black 1963
†Palaearctomys montanus Douglass 1903
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Invalid names: Palaearctomys macrorhinus Douglass 1903 [synonym]