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Fossil collection records
Fossil organisms
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Classifications of taxa in groups
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Classification of Stirton 1933
G. †
Merychippus
Leidy 1856
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Merychippus perditus
Leidy 1858
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Merychippus sejunctus
Cope 1874
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Merychippus sumani
Merriam 1915
G. †
Pliohippus
Marsh 1874
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Pliohippus simus
Gidley 1906
G. †
Protohippus
Leidy 1858
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Protohippus intermontanus
Merriam 1915