Classification of Simpson 1932

Fm. Sirenia Illiger 1811 [sirenian]
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Subor. †Desmostyliformes Hay 1923
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Fm. †Desmostylidae Osborn 1905
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G. †Desmostylus Marsh 1888
Subor. Trichechiformes Hay 1923
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Fm. Dugongidae Gray 1821 [dugong]
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Subfm. Dugonginae Gray 1821
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G. Dugong Lacépède 1799 [dugong]
Fm. †Halitheriinae Gill 1872
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G. †Felsinotherium Capellini 1872
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Felsinotherium gunteri Simpson 1932
G. †Halitherium Kaup 1838
G. †Hesperosiren Simpson 1932
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Hesperosiren crataegensis Simpson 1932
G. †Manatherium Hartlaub 1886
G. †Metaxytherium de Christol 1840
G. †Thalattosiren Sickenberg 1928
Subfm. †Hydrodamalinae Palmer 1895
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G. †Hydrodamalis Retzius 1794 [Steller's sea cow]
Subfm. †Miosireninae Abel 1919
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G. †Miosiren Dollo 1889
Subfm. †Rytiodinae Simpson 1932
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G. †Rytiodus Lartet 1866
Fm. †Prorastomidae Cope 1889
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G. †Eotheroides Palmer 1899
G. †Prorastomus Owen 1855
Fm. Trichechidae Gray 1821 [manatee]
Or. Sirenia Illiger 1811 [sirenian]
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Invalid names: Manatus antiquus Leidy 1856 [nomen dubium], Manatus inornatus Leidy 1873 [nomen dubium]