Classification of Gingerich 1989
Fm. †Esthonychidae Cope 1883
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G. †Azygonyx Gingerich 1989
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†Azygonyx ancylion Gingerich and Gunnell 1979
†Azygonyx grangeri Simpson 1937
†Azygonyx gunnelli Gingerich 1989
†Azygonyx latidens Simpson 1937
†Azygonyx xenicus Gingerich and Gunnell 1979
G. †Esthonyx Cope 1874
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†Esthonyx acutidens Cope 1881
†Esthonyx spatularius Cope 1880
G. †Ectoganus Cope 1874
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†Ectoganus bighornensis Schoch 1981
†Ectoganus lobdelli Simpson 1929
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Invalid names: Lampadophorus expectatus Patterson 1949 [synonym]
Fm. †Oxyaenidae Cope 1877
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G. †Dipsalidictis Matthew and Granger 1915
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†Dipsalidictis platypus Matthew and Granger 1915
†Dipsalidictis transiens Matthew and Granger 1915
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Invalid names: Dipsalidictis amplus Jepsen 1930 [synonym]
Invalid names: Dipsalidictides Denison 1938 [synonym]
Fm. †Arctocyonidae Murray 1866 [condylarth]
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Fm. †Phenacodontidae Cope 1881 [condylarth]
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G. †Hyracotherium Owen 1841
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†Hyracotherium grangeri Gingerich 1989
†Hyracotherium index Cope 1873
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Invalid names: Hyracotherium sulcatus Gingerich 1989 [synonym], Orohippus angustidens Cope 1875 [synonym], Orohippus cuspidatus Cope 1875 [synonym], Orotherium loevii Cope 1877 [synonym]
†Hyracotherium sandrae Gingerich 1989