Classification of Mader 1989

Anisacodon montanus Marsh 1875
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Brontotherium gigas Marsh 1873
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Brontotherium ingens Marsh 1873
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Brontotherium leidyi Osborn 1902
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G. †Brontotherium Marsh 1873
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G. †Diconodon Marsh 1876
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Megacerops riggsi Osborn 1916
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Menodus dolichoceras Scott and Osborn 1887
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Menodus tichoceras Scott and Osborn 1887
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G. †Menodus Pomel 1848
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Palaeosyops manteoceras Matthew 1899
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Palaeotherium proutii Leidy 1850
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Symborodon bucco Cope 1873
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Symborodon copei Osborn 1908
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Symborodon hypoceras Cope 1874
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Symborodon torvus Cope 1873
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G. †Symborodon Cope 1873
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Titanops medius Marsh 1891
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G. †Titanotherium Leidy 1852
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Fm. †Brontotheridae Marsh 1873 [brontothere]
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G. †Brontops Marsh 1887
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Brontops amplus Marsh 1890
Brontops bicornutus Osborn 1902
Brontops dispar Marsh 1887
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Invalid names: Brontops validus Marsh 1891 [synonym]
Brontops robustus Marsh 1887
Brontops selwynianus Cope 1889
Brontops tyleri Lull 1905
Invalid names: Diploclonus Marsh 1890 [synonym]
G. †Eotitanops Osborn 1907
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Eotitanops borealis Cope 1880
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Invalid names: Eotitanops gregoryi Osborn 1913 [synonym]
G. †Eotitanotherium Peterson 1914
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Eotitanotherium osborni Peterson 1914
Invalid names: Diploceras Peterson 1914 [synonym]
G. †Megacerops Leidy 1870
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Megacerops acer Cope 1873
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Invalid names: Symborodon altirostris Cope 1873 [synonym]
Megacerops curtus Marsh 1887
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Invalid names: Menodus peltoceras Cope 1891 [synonym]
Megacerops elatus Marsh 1887
Megacerops hatcheri Osborn 1908
Invalid names: Megaceratops Cope 1873 [synonym], Titanops Marsh 1887 [synonym]
G. †Menops Marsh 1887
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Menops bakeri Stovall 1948
Menops crassicornis Marsh 1891
Menops heloceras Cope 1873
Menops marshi Osborn 1902
Menops serotinus Marsh 1887
Menops trigonoceras Cope 1873
Menops varians Marsh 1887
Menops walcotti Osborn 1916
Invalid names: Allops Marsh 1887 [synonym]
G. †Protitanotherium Osborn 1908
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Invalid names: Titanotheriidae [synonym]
G. †Dolichorhinus Hatcher 1895
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Dolichorhinus cornutum Osborn 1895
Dolichorhinus hyognathus Osborn 1889
G. †Duchesneodus Lucas and Schoch 1982
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Duchesneodus uintensis Peterson 1931
G. †Mesatirhinus Osborn 1908
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G. †Metatelmatherium Granger and Gregory 1938
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Metatelmatherium ultimum Osborn 1908
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Invalid names: Manteoceras uintensis Douglass 1909 [synonym]
G. †Palaeosyops Leidy 1870
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Palaeosyops priscus Osborn 1908
Invalid names: Eometarhinus Osborn 1919 [synonym], Limnohyops Marsh 1890 [synonym], Limnohyus Marsh 1872 [synonym]
G. †Rhadinorhinus Riggs 1912
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Rhadinorhinus diploconum Osborn 1895
G. †Sthenodectes Gregory 1912
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Sthenodectes incisivum Douglass 1909
G. †Telmatherium Marsh 1872
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Telmatherium cultridens Osborn et al. 1878
Telmatherium foris Cook 1926
Invalid names: Leurocephalus Osborn et al. 1878 [synonym], Manteoceras Hatcher 1895 [synonym], Telmatotherium Marsh 1872 [synonym]
G. †Palaeosyops Marsh 1872
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Palaeosyops laticeps Leidy 1872