Classification of Mader 1998

†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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†Heterotitanops parvus Peterson 1914
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G. †Heterotitanops Peterson 1914
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†Megaceratops acer Cope 1873
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G. †Megaceratops Cope 1873
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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 junior Leidy 1872
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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 elatus Marsh 1887
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†Titanops medius Marsh 1891
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G. †Titanotherium Leidy 1852
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Or. Perissodactyla Owen 1848 [odd-toed ungulate]
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G. †Lambdotherium Cope 1880
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 brachycephalus 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]
Subfm. †Brontotheriinae Marsh 1873
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G. †Duchesneodus Lucas and Schoch 1982
G. †Protitanops Stock 1936
G. †Telmatherium Marsh 1872
Subfm. †Dolichorhinae Riggs 1912
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G. †Mesatirhinus Osborn 1908
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Invalid names: Mesatirhinus petersoni Osborn 1908 [synonym]
G. †Metarhinus Osborn 1908
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†Metarhinus diploconus Osborn 1895
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Invalid names: Rhadinorhinus abbotti Riggs 1912 [synonym]
Invalid names: Rhadinorhinus Riggs 1912 [synonym]
G. †Sphenocoelus Osborn 1895
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†Sphenocoelus blairi Cook 1926
†Sphenocoelus bridgeri Cook 1926
†Sphenocoelus hyognathus Osborn 1889
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Invalid names: Dolichorhinus longiceps Douglass 1909 [synonym], Telmatotherium cornutum Osborn 1895 [synonym]
†Sphenocoelus intermedius Osborn 1908
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Invalid names: Dolichorhinus fluminalis Riggs 1912 [synonym], Dolichorhinus heterodon Douglass 1909 [synonym], Mesatirhinus superior Riggs 1912 [synonym]
Invalid names: Dolichorhinus Hatcher 1895 [synonym], Tanyorhinus Cook 1926 [synonym]
G. †Eotitanops Osborn 1907
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†Eotitanops borealis Cope 1880
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Invalid names: Eotitanops major Osborn 1913 [synonym], Eotitanops princeps Osborn 1913 [synonym], Lambdotherium brownianum Cope 1881 [synonym]
†Eotitanops gregoryi Osborn 1913
G. †Megacerops Leidy 1870
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†Megacerops curtus Marsh 1887
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Invalid names: Menodus peltoceras Cope 1891 [synonym]
†Megacerops hatcheri Osborn 1908
†Megacerops platyceras Scott and Osborn 1887
Invalid names: 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. †Notiotitanops Gazin and Sullivan 1942
Subfm. †Palaeosyopinae Steinmann and Döderlein 1890
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G. †Palaeosyops Leidy 1870
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Invalid names: Eometarhinus huerfanensis Osborn 1919 [synonym]
†Palaeosyops paludosus Leidy 1870
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Invalid names: Canis marshii Hay 1899 [synonym], Limnohyops matthewi Osborn 1908 [synonym], Limnohyops monoconus Osborn 1908 [synonym], Limnohyops priscus Osborn 1908 [synonym], Limnohyus laevidens Cope 1873 [synonym], Palaeosyops humilis Leidy 1872 [synonym], Palaeosyops longirostris Earle 1892 [synonym], Palaeosyops major Leidy 1871 [synonym]
†Palaeosyops robustus Marsh 1872
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Invalid names: Palaeosyops copei Osborn 1908 [synonym], Palaeosyops diaconus Cope 1873 [synonym], Palaeosyops grangeri Osborn 1908 [synonym], Palaeosyops leidyi Osborn 1908 [synonym]
Invalid names: Eometarhinus Osborn 1919 [synonym], Limnohyops Marsh 1890 [synonym], Limnohyus Marsh 1872 [synonym]
Invalid names: Titanotheriidae [synonym]
G. †Sthenodectes Gregory 1912
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†Sthenodectes incisivum Douglass 1909
†Metarhinus fluviatilis Osborn 1908
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Invalid names: Metarhinus riparius Riggs 1912 [synonym]