Classification of de Muizon and Domning 1985

Or. Sirenia Illiger 1811 [sirenian]
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Fm. Dugongidae Gray 1821 [dugong]
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Fm. †Halitheriinae Gill 1872
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G. †Metaxytherium de Christol 1840
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Metaxytherium calvertense Kellogg 1966