Classification of Boessenecker 2011

Fm. †Desmatophocidae Hay 1930
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G. †Allodesmus Kellogg 1922
Fm. Cetotheriidae Brandt 1872
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G. †Nannocetus Kellogg 1929
Fm. Equidae Gray 1821 [horse]
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G. †Archaeohippus Gidley 1906
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†Archaeohippus mourningi Merriam 1913
G. †Hipparion de Christol 1832
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†Hipparion forcei Richey 1948
Fm. †Gomphotheriidae Hay 1922 [gomphothere]
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G. †Gomphotherium Burmeister 1837
Fm. Dugongidae Gray 1821 [dugong]
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G. †Dusisiren Domning 1978
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†Dusisiren jordani Kellogg 1925
G. †Cormohipparion Skinner and MacFadden 1977
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Unr. †Desmostylia Reinhart 1953 [desmostylian]
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Fm. †Desmostylidae Osborn 1905
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G. †Desmostylus Marsh 1888
Fm. †Paleoparadoxiidae Reinhart 1959
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G. †Paleoparadoxia Reinhart 1959
Fm. †Allodelphinidae Barnes 2006
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G. †Zarhinocetus Barnes and Reynolds 2009
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†Zarhinocetus errabundus Kellogg 1931
Fm. Odobenidae Allen 1880 [walrus]
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G. †Imagotaria Mitchell 1968
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†Imagotaria downsi Mitchell 1968
Subfm. Herpetocetinae Steeman 2007
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Invalid names: Herpetocetus sendaicus Hatai et al. 1963 [nomen dubium]
Fm. Otariidae Gray 1825 [eared seal]
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G. †Pithanotaria Kellogg 1925
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†Pithanotaria starri Kellogg 1925