Classification of Mader 1989
†Anisacodon montanus Marsh 1875
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†Brontotherium gigas Marsh 1873
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†Brontotherium ingens Marsh 1874
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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 assiniboiensis Lambe 1908
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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 giganteum Pomel 1849
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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 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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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 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]
Invalid names: Titanotheriidae [synonym]
G. †Dolichorhinus Hatcher 1895
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†Dolichorhinus cornutum Osborn 1895
†Dolichorhinus hyognathus Osborn 1889
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. †Telmatherium Marsh 1872
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†Telmatherium cultridens Osborn et al. 1878
†Telmatherium foris Cook 1926
†Telmatherium pratensis Cook 1926
†Telmatherium vallidens Cope 1872
†Telmatherium washakiensis Osborn 1908
Invalid names: Leurocephalus Osborn et al. 1878 [synonym], Manteoceras Hatcher 1895 [synonym], Telmatotherium Marsh 1872 [synonym]