Classification of Troxell 1922
†Hyrachyus crassidens Osborn et al. 1878
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†Hyrachyus paradoxus Osborn 1878
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G. †Hyrachyus Leidy 1871
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†Hyrachyus affinis Marsh 1871
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Invalid names: Hyrachyus implicatus Cope 1873 [synonym], Hyrachyus intermedius Osborn et al. 1878 [synonym]
†Hyrachyus agrarius Leidy 1871
†Hyrachyus agrestis Leidy 1871
†Hyrachyus bairdianus Marsh 1871
†Hyrachyus modestus Leidy 1870
Invalid names: Hyrachyus eximius Leidy 1871 [synonym]
†Hyrachyus princeps Marsh 1872
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Invalid names: Hyrachyus imperialis Osborn et al. 1878 [synonym]