Classification of Kohno and Ray 2008
Cl. Mammalia Linnaeus 1758 [mammal]
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Or. Carnivora Bowdich 1821 [carnivoran]
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Unr. Pinnipedia Illiger 1811 [pinniped]
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Fm. Odobenidae Allen 1880 [walrus]
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Subfm. Odobeninae Allen 1880
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Tr. Odobenini Allen 1880
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G. †Ontocetus Leidy 1859
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†Ontocetus emmonsi Leidy 1859
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Invalid names: Alachtherium africanum Geraads 1997 [synonym], Alachtherium antverpiensis Rutten 1907 [synonym], Alachtherium cretsii Du Bus 1867 [synonym], Prorosmarus alleni Berry and Gregory 1906 [synonym], Trichecodon huxleyi Lankester 1865 [synonym]
Invalid names: Alachtherium Du Bus 1867 [synonym], Prorosmarus Berry and Gregory 1906 [synonym], Trichechodon Lankester 1865 [synonym], Trichecodon koninckii Van Beneden 1871 [nomen dubium]
†Odobenus antverpiensis Rutten 1907
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Invalid names: Alachtherium antwerpiensis Hasse 1909 [synonym]