Classification of Munthe 1988
†Horatiomys montanus Wood 1935
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G. †Horatiomys Wood 1935
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G. †Cynarctoides McGrew 1938
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†Cynarctoides acridens Barbour and Cook 1914
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Invalid names: Cynarctus mustelinus Matthew 1932 [synonym]
G. †Mesogaulus Riggs 1899
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†Mesogaulus novellus Matthew 1924
†Mesogaulus vetus Matthew 1924
Fm. Heteromyidae Gray 1868
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