Classification of Simpson 1932

Fm. Sirenia Illiger 1811 [sirenian]
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Invalid names: Desmostyliformes Hay 1923 [empty], Trichechiformes Hay 1923 [empty]
Or. Sirenia Illiger 1811 [sirenian]
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Invalid names: Manatus antiquus Leidy 1856 [nomen dubium], Manatus inornatus Leidy 1873 [nomen dubium]