Classification of Williamson 1996
†Ellipsodon aequidens Matthew 1937
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†Triisodon heilprinianus Cope 1882
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Fm. Didelphidae Gray 1821 [opossum]
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G. †Coriphagus Douglass 1908
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†Coriphagus encinensis Matthew and Granger 1921
Invalid names: Mixoclaenus Matthew and Granger 1921 [synonym]
G. †Adunator Russell 1964
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†Adunator fredericki Rigby, Jr. 1980
†Adunator martinezi Rigby, Jr. 1980
Invalid names: Mckennatherium Van Valen 1965 [synonym]
G. †Plesiolestes Jepsen 1930
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†Plesiolestes wilsoni Gazin 1968
Invalid names: Torrejonia Gazin 1968 [synonym]
Fm. †Arctocyonidae Murray 1866 [condylarth]
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G. †Arctocyon Blainville 1841
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†Arctocyon ferox Cope 1883
Invalid names: Claenodon Scott 1892 [synonym]
G. †Chriacus Cope 1883
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Invalid names: Metachriacus Simpson 1935 [synonym], Spanoxyodon Simpson 1935 [synonym], Tricentes Cope 1884 [synonym]
G. †Colpoclaenus Patterson and McGrew 1962
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†Colpoclaenus procyonoides Matthew 1937
G. †Loxolophus Cope 1885
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†Loxolophus priscus Cope 1888
†Loxolophus stenognathus Matthew 1897
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Invalid names: Protogonodon grangeri Simpson 1936 [synonym]
Invalid names: Protogonodon Scott 1892 [synonym]
G. †Prothryptacodon Simpson 1935
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†Prothryptacodon ambiguus Van Valen 1967
†Prothryptacodon hilli Rigby, Jr. 1980
Invalid names: Pantinomia Van Valen 1967 [synonym]
Fm. †Mioclaenidae Osborn and Earle 1895 [condylarth]
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G. †Protoselene Matthew 1897
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†Protoselene griphus Gazin 1939
Invalid names: Dracoclaenus Gazin 1939 [synonym]
Fm. †Periptychidae Cope 1882 [condylarth]
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G. †Gillisonchus Rigby 1981
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G. †Oxyacodon Osborn and Earle 1895
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†Oxyacodon priscilla Matthew 1937
Invalid names: Fimbrethil Van Valen 1978 [synonym]
G. †Periptychus Cope 1881
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†Periptychus coarctatus Cope 1883
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Invalid names: Periptychus hamaxitus Gazin 1941 [synonym], Plagioptychus matthewi Simpson 1936 [synonym]
Invalid names: Carsioptychus Simpson 1936 [synonym], Catathlaeus Cope 1881 [synonym], Plagioptychus Matthew 1936 [synonym]
G. †Oxyclaenus Cope 1884
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†Oxyclaenus antiquus Simpson 1936
Invalid names: Thangorodrim Van Valen 1978 [synonym]
G. †Triisodon Cope 1881
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†Acmeodon secans Matthew and Granger 1921
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Invalid names: Acmeodon hyoni Rigby, Jr. 1980 [synonym]
†Anisonchus sectorius Cope 1881
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Invalid names: Anisonchus dracus Gazin 1939 [synonym]
†Chriacus baldwini Cope 1882
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Invalid names: Chriacus schlosserianus Cope 1888 [synonym], Chriacus truncatus Cope 1884 [synonym], Metachriacus provocator Simpson 1935 [synonym], Oxyclaenus pearcei Gazin 1941 [synonym], Spanoxyodon latrunculus Simpson 1935 [synonym], Tricentes crassicollidens Cope 1884 [synonym]
†Conacodon kohlbergeri Archibald et al. 1983
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Invalid names: Conacodon utahensis Robison 1986 [synonym]
†Desmatoclaenus hermaeus Gazin 1941
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Invalid names: Desmatoclaenus paracreodus Gazin 1941 [synonym]
†Ectoconus ditrigonus Cope 1882
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Invalid names: Ectoconus majusculus Matthew 1937 [synonym]
†Ellipsodon grangeri Wilson 1956
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Invalid names: Ellipsodon witkoi Van Valen 1978 [synonym], Ellipsodon yotankae Van Valen 1978 [synonym]
†Haploconus angustus Cope 1881
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Invalid names: Haploconus corniculatus Cope 1888 [synonym], Haploconus inopinatus Gazin 1939 [synonym]
†Litomylus dissentaneus Simpson 1935
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Invalid names: Litomylus osceolae Van Valen 1978 [synonym]
†Loxolophus hyattianus Cope 1885
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Invalid names: Mimotricentes mirielae Van Valen 1978 [synonym]
†Mimotricentes subtrigonus Cope 1881
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Invalid names: Tricentes elassus Gazin 1941 [synonym], Tricentes latidens Gidley 1935 [synonym]
†Mioclaenus turgidus Cope 1881
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Invalid names: Mioclaenus lydekkerianus Cope 1888 [synonym]
†Mixodectes malaris Cope 1884
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Invalid names: Oxyacodon tecumsae Van Valen 1978 [synonym]
†Mixodectes pungens Cope 1883
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Invalid names: Mixodectes crassiusculus Cope 1883 [synonym]
†Oxyacodon agapetillus Cope 1884
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Invalid names: Fimbrethil ambaronae Van Valen 1978 [synonym]
†Oxyclaenus pugnax Simpson 1935
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Invalid names: Thangorodrim thalion Van Valen 1978 [synonym]
†Oxyclaenus simplex Cope 1884
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Invalid names: Mioclaenus filholianus Cope 1888 [synonym]
†Pantolambda intermedius Simpson 1935
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Invalid names: Titanoides simpsoni Simons 1960 [synonym]
†Periptychus carinidens Cope 1881
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Invalid names: Catathlaeus rhabdodon Cope 1881 [synonym], Periptychus gilmorei Gazin 1938 [synonym], Periptychus superstes Matthew 1935 [synonym]
†Prolimnocyon durini Van Valen 1978
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Invalid names: Prolimnocyon macfaddeni Rigby, Jr. 1980 [synonym]
†Promioclaenus acolytus Cope 1882
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Invalid names: Ellipsodon aquilonius Simpson 1935 [synonym]
†Promioclaenus lemuroides Matthew 1897
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Invalid names: Ellipsodon shepherdi Gazin 1939 [synonym], Jepsenia mantiensis Gazin 1939 [synonym]
†Tetraclaenodon puercensis Cope 1881
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Invalid names: Protogonia plicifera Cope 1882 [synonym]
†Triisodon quivirensis Cope 1881
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Invalid names: Sarcothraustes antiquus Cope 1882 [synonym], Triisodon conidens Cope 1882 [synonym]