Classification of Matthew 1909
†Elomeryx mitis Marsh 1894
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†Heptacodon armatus Marsh 1894
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†Stypolophus aculeatus Cope 1872
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†Stypolophus insectivorus Cope 1871
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†Triacodon fallax Marsh 1871
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†Triacodon grandis Marsh 1872
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†Triacodon nanus Marsh 1872
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G. †Triacodon Marsh 1871
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†Viverravus nitidus Marsh 1872
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†Ziphacodon rugatus Marsh 1872
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G. †Ziphacodon Marsh 1872
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G. †Pantolestes Cope 1872
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†Pantolestes elegans Marsh 1872
†Pantolestes intermedius Matthew 1909
†Pantolestes longicaudus Cope 1872
†Pantolestes natans Matthew 1909
†Pantolestes phocipes Matthew 1909
Invalid names: Anisacodon Marsh 1872 [synonym], Passalacodon Marsh 1872 [synonym]
Fm. Erinaceidae Fischer von Waldheim 1817 [hedgehog]
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G. †Nyctitherium Marsh 1872
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†Nyctitherium curtidens Matthew 1909
†Nyctitherium nitidus Marsh 1872
†Nyctitherium serotinum Marsh 1872
Invalid names: Nyctilestes Marsh 1872 [synonym], Talpavus Marsh 1872 [synonym]
Fm. †Microsyopidae Osborn and Wortman 1892
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G. †Notharctus Leidy 1870
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Invalid names: Limnotherium Marsh 1871 [synonym], Tomitherium Cope 1872 [synonym]
Fm. †Omomyidae Gazin 1958
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G. †Pterodon Blainville 1839
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Invalid names: Hemipsalodon Cope 1885 [synonym], Hemipsalodon grandis Cope 1885 [synonym]
G. †Sinopa Leidy 1871
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†Sinopa hians Cope 1877
†Sinopa multicuspis Cope 1875
†Sinopa pungens Cope 1872
†Sinopa secundaria Cope 1875
†Sinopa viverrina Cope 1874
†Sinopa whitiae Cope 1882
Invalid names: Prototomus Cope 1874 [synonym], Stypolophus Cope 1871 [synonym]
G. †Tritemnodon Matthew 1906
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Fm. †Limnocyonidae
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G. †Thinocyon Marsh 1872
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†Thinocyon cledensis Matthew 1909
†Thinocyon medius Wortman 1902
†Thinocyon minimus Matthew 1909
†Thinocyon mustelinus Matthew 1909
†Thinocyon velox Marsh 1872
Fm. †Oxyaenidae Cope 1877
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G. †Patriofelis Leidy 1870
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†Patriofelis coloradensis Matthew 1909
†Patriofelis ferox Marsh 1872
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Invalid names: Aelurotherium bicuspis Wortman 1901 [synonym], Aelurotherium latidens Marsh 1872 [synonym], Limnofelis latidens Marsh 1872 [synonym], Patriofelis leidyanus Osborn and Wortman 1892 [synonym]
†Patriofelis tigrinus Cope 1880
Invalid names: Aelurotherium Adams 1896 [synonym], Limnofelis Marsh 1872 [synonym], Oreocyon Marsh 1872 [synonym], Protopsalis Cope 1880 [synonym]
Fm. †Miacidae Cope 1880
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G. †Miacis Cope 1872
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†Miacis hargeri Wortman 1901
†Miacis medius Matthew 1909
†Miacis parvivorus Cope 1872
†Miacis sylvestris Marsh 1872
†Miacis vulpinus Scott and Osborn 1887
†Miacis washakius Wortman 1901
Invalid names: Harpalodon Marsh 1872 [synonym]
G. †Oodectes Wortman 1901
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†Oodectes proximus Matthew 1909
†Oodectes pugnax Wortman and Matthew 1899
G. †Uintacyon Leidy 1873
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Subg. †Uintacyon (Miocyon) Matthew 1909
†Uintacyon bathygnathus Scott 1888
†Uintacyon jugulans Matthew 1909
†Uintacyon major Matthew 1909
†Uintacyon massetericus Cope 1882
†Uintacyon scotti Wortman and Matthew 1899
G. †Vulpavus Marsh 1871
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†Vulpavus canavus Cope 1881
†Vulpavus completus Matthew 1909
†Vulpavus ovatus Matthew 1909
†Vulpavus profectus Matthew 1909
Fm. †Viverravidae Wortman and Matthew 1899
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G. †Viverravus Marsh 1872
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†Viverravus dawkinsianus Cope 1881
†Viverravus sicarius Matthew 1909
G. †Prosciurus Matthew 1903
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†Prosciurus jeffersoni Douglass 1902
†Prosciurus relictus Cope 1873
G. †Hyopsodus Leidy 1870
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†Hyopsodus despiciens Matthew 1909
†Hyopsodus lepidus Matthew 1909
†Hyopsodus minusculus Leidy 1873
Invalid names: Lemuravus Marsh 1875 [synonym]
G. †Leptochoerus Leidy 1856
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†Leptochoerus lemurinus Cope 1874
†Leptochoerus robustus Marsh 1875
G. †Anthracotherium Cuvier 1822
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†Anthracotherium curtum Marsh 1894
Invalid names: Heptacodon Marsh 1894 [synonym]
Fm. Camelidae Gray 1821 [camel]
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G. †Paratylopus Matthew 1904
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†Paratylopus cameloides Wortman 1898
†Paratylopus sternbergi Cope 1879
Fm. †Hapalodectidae Szalay and Gould 1966 [condylarth]
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G. †Hapalodectes Matthew 1909
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†Hapalodectes compressus Matthew 1909
†Hapalodectes leptognathus Osborn and Wortman 1892
Fm. †Mesonychidae Cope 1875 [condylarth]
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G. †Synoplotherium Cope 1872
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†Synoplotherium vorax Marsh 1876
Invalid names: Dromocyon Marsh 1876 [synonym]
G. †Eohippus Marsh 1876
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†Eohippus pernix Marsh 1876
†Eohippus vasacciensis Cope 1872
†Eohippus venticolus Cope 1881
Invalid names: Protorohippus Wortman 1896 [synonym]
G. †Merychippus Leidy 1856
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†Merychippus isonesus Cope 1889
†Merychippus paniensis Cope 1874
†Merychippus sejunctus Cope 1874
†Merychippus seversus Cope 1878
†Merychippus sphenodus Cope 1889
Invalid names: Stylonus Cope 1878 [synonym]
G. †Miohippus Marsh 1874
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†Miohippus condoni Leidy 1870
†Miohippus gidleyi Osborn 1904
†Miohippus validus Osborn 1904
G. †Neohipparion Gidley 1903
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†Neohipparion eurystyle Cope 1893
†Neohipparion gratum Leidy 1869
†Neohipparion ingenuum Leidy 1885
†Neohipparion lenticularis Cope 1893
†Neohipparion montezuma Leidy 1882
†Neohipparion occidentale Leidy 1856
†Neohipparion peninsulatum Cope 1885
†Neohipparion plicatile Leidy 1887
†Neohipparion rectidens Cope 1886
†Neohipparion relictum Cope 1889
†Neohipparion retrusum Cope 1889
†Neohipparion sinclairi Wortman 1882
†Neohipparion speciosum Leidy 1854
†Neohipparion whitneyi Gidley 1903
G. †Protohippus Leidy 1858
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†Protohippus cumminsii Cope 1893
†Protohippus interpolatus Cope 1893
†Protohippus perditus Leidy 1858
†Protohippus pernix Marsh 1874
†Protohippus phlegon Hay 1899
†Protohippus profectus Cope 1889
†Protohippus robustus Marsh 1874
†Protohippus spectans Cope 1880
†Protohippus supremus Leidy 1869
G. †Alticamelus Matthew 1901
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†Alticamelus giraffinus Matthew 1909
†Alticamelus leptocolon Matthew 1909
†Didymictis haydenianus Cope 1882
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Invalid names: Didymictis primus Cope 1884 [synonym]
†Entomacodon minutus Marsh 1872
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Invalid names: Centracodon delicatus Marsh 1872 [synonym]
G. †Hyopotamus Leidy 1857
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†Hyopotamus brachyrhynchus Osborn and Wortman 1894
†Hyopotamus rostratus Scott 1894
†Hyopsodus paulus Leidy 1870
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Invalid names: Lemuravus distans Marsh 1875 [synonym], Microsyops vicarius Cope 1873 [synonym]
†Pantolestes longieundus Cope 1872
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Invalid names: Passalacodon littoralis Marsh 1872 [synonym]
†Viverravus gracilis Marsh 1872
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Invalid names: Harpalodon vulpinus Marsh 1872 [synonym]
Subg. †Miolabis (Paratylopus) Matthew 1904
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†Miolabis (Paratylopus) primaevus Matthew 1904
Subg. †Sciurus (Prosciurus) Matthew 1903
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†Sciurus (Prosciurus) vetustus Matthew 1903