Classification of Leidy 1857
G. †Lepidotus Agassiz 1832
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†Lepidotus haydeni Leidy 1856
†Lepidotus occidentalis Leidy 1856
G. †Mosasaurus Parkinson 1822
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†Mosasaurus missouriensis Harlan 1834
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Invalid names: Mosasaurus maximilliani Goldfuss 1845 [synonym]
G. Testudo Linnaeus 1758
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†Testudo nebrascensis Leidy 1851
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Invalid names: Emys culbertsonii Leidy 1852 [synonym], Emys hemispherica Leidy 1851 [synonym], Emys oweni Leidy 1851 [synonym]
G. †Megalosaurus Parkinson 1822
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G. †Hyaenodon Laizer and Parieu 1838
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†Hyaenodon crucians Leidy 1853
†Hyaenodon cruentus Leidy 1853
†Hyaenodon horridus Leidy 1853
G. †Amphicyon Lartet 1836
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†Amphicyon gracilis Leidy 1856
†Amphicyon vetus Leidy 1853
G. †Choeropotamus Desmarest 1822
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Subg. †Choeropotamus (Hyopotamus) Leidy 1857
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†Choeropotamus (Hyopotamus) americanus Leidy 1856
Invalid names: Choeropotamus (Hyopotamus) Leidy 1857 [replaced], Choeropotamus (Hyopotamus) Leidy 1857 [replaced], Choeropotamus (Hyopotamus) americanus Leidy 1856 [valid]
G. †Entelodon Aymard 1846
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†Entelodon ingens Leidy 1856
Invalid names: Arctodon Leidy 1852 [synonym]
G. †Agriochoerus Leidy 1850
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G. †Leptauchenia Leidy 1856
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†Leptauchenia decora Leidy 1856
†Leptauchenia major Leidy 1856
G. †Hipparion de Christol 1832
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†Hipparion occidentale Leidy 1856
†Hipparion speciosum Leidy 1854
G. Rhinoceros Linnaeus 1758 [one-horned rhinoceros]
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†Rhinoceros occidentalis Leidy 1850
†Entelodon mortoni Leidy 1850
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Invalid names: Archaeotherium robustum Leidy 1852 [synonym]
G. †Oreodon Leidy 1851
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†Oreodon culbertsoni Leidy 1848
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Invalid names: Cotylops speciosa Leidy 1851 [synonym], Oreodon priscus Leidy 1851 [synonym]
†Oreodon gracilis Leidy 1851
†Oreodon major Leidy 1853
G. †Titanotherium Leidy 1852
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†Titanotherium proutii Leidy 1850
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Invalid names: Palaeotherium giganteum Pomel 1849 [synonym], Rhinoceros americanus Leidy 1852 [synonym]