Classification of Wood 1934

G. †Chasmotheroides Wood 1934
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†Chasmotheroides intermedius Osborn et al. 1878
G. †Ephyrachyus Wood 1934
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†Hyrachyus crassidens Osborn et al. 1878
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†Hyrachyus paradoxus Osborn 1878
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G. †Hyracotherium Owen 1841
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Invalid names: Systemodon Cope 1881 [synonym]
G. †Heptodon Cope 1882
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†Heptodon singularis Cope 1875
Superfm. Tapiroidea Gill 1872
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G. †Helaletes Marsh 1872
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†Helaletes boops Marsh 1872
†Helaletes nanus Marsh 1871
†Helaletes pumilus Marsh 1871
G. †Hyrachyus Leidy 1871
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†Hyrachyus affinis Marsh 1871
†Hyrachyus douglassi Wood 1934
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Invalid names: Hyrachyus priscus Douglass 1903 [replaced]
†Hyrachyus eximius Leidy 1871
†Hyrachyus grandis Peterson 1919
†Hyrachyus hypostylus Wood 1934
†Hyrachyus modestus Leidy 1870
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Invalid names: Hyrachyus agrarius Leidy 1871 [synonym], Hyrachyus agrestis Leidy 1871 [synonym], Lophiodon bairdianus Marsh 1871 [synonym]
†Hyrachyus princeps Marsh 1872
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Invalid names: Hyrachyus imperialis Osborn et al. 1878 [synonym]
G. †Metahyrachyus Troxell 1922
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G. †Prothyracodon Scott and Osborn 1887
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†Prothyracodon obliquidens Scott and Osborn 1887