Classification of Mader 2008

Fm. †Brontotheriidae Marsh 1873 [brontothere]
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Subfm. †Brontotheriinae Marsh 1873
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G. †Eotitanotherium Peterson 1914
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Eotitanotherium osborni Peterson 1914
Invalid names: Diploceras Peterson 1914 [replaced]
G. †Protitanotherium Osborn 1908
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G. †Pseudodiplacodon Mader 2000
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Pseudodiplacodon progressum Peterson 1934
G. †Telmatherium Marsh 1872
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Telmatherium validus Marsh 1872
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Invalid names: Telmatherium cultridens Osborn et al. 1878 [synonym], Telmatherium manteoceras Matthew 1899 [synonym], Telmatherium washakiensis Osborn 1908 [synonym]
Invalid names: Leurocephalus Osborn et al. 1878 [synonym], Manteoceras Hatcher 1895 [synonym], Telmatotherium Marsh 1872 [synonym]
Subfm. †Dolichorhininae Riggs 1912
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G. †Mesatirhinus Osborn 1908
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Invalid names: Mesatirhinus petersoni Osborn 1908 [synonym]
Invalid names: Mesatirhinus junius Leidy 1872 [nomen dubium]
G. †Metarhinus Osborn 1908
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Metarhinus diploconus Osborn 1895
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Invalid names: Metarhinus pater Stock 1937 [synonym]
Metarhinus fluviatilis Osborn 1908
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Invalid names: Metarhinus riparius Riggs 1912 [synonym]
Invalid names: Heterotitanops Peterson 1914 [synonym], Rhadinorhinus Riggs 1912 [synonym]
G. †Sphenocoelus Osborn 1895
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Sphenocoelus hyognathus Osborn 1889
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Invalid names: Dolichorhinus longiceps Douglass 1909 [synonym], Sphenocoelus 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]
Sphenocoelus uintensis Osborn 1895
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Invalid names: Sphenocoelus blairi Cook 1926 [synonym], Sphenocoelus bridgeri Cook 1926 [synonym], Sphenocoelus harundivoras Cook 1926 [synonym]
Invalid names: Dolichorhinoides Granger and Gregory 1943 [synonym], Dolichorhinus Hatcher 1895 [synonym], Tanyorhinus Cook 1926 [synonym]
Invalid names: Rhadinorhininae Osborn 1929 [synonym]
G. †Metatelmatherium Granger and Gregory 1938
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Metatelmatherium cristatum Granger and Gregory 1938
Metatelmatherium ultimum Osborn 1908
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Invalid names: Manteoceras uintensis Douglass 1909 [synonym]
G. †Sthenodectes Gregory 1912
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Sthenodectes incisivum Douglass 1909