Classification of McCarroll et al. 1996
G. †Isectolophus Scott and Osborn 1887
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†Isectolophus latidens Osborn et al. 1878
G. †Hyrachyus Leidy 1871
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†Hyrachyus eximius Leidy 1871
†Hyrachyus modestus Leidy 1870
G. †Forstercooperia Wood 1939
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†Forstercooperia grandis Peterson 1919
Invalid names: Cooperia Wood 1938 [replaced]
†Helaletes intermedius Osborn et al. 1878
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Invalid names: Desmatotherium guyotii Scott 1883 [synonym]