Classification of Domning 2018
Or. Sirenia Illiger 1811 [sirenian]
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Fm. Dugongidae Gray 1821 [dugong]
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Subfm. †Halitheriinae Gill 1872
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G. †Metaxytherium de Christol 1840
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†Metaxytherium crataegense Simpson 1932
†Metaxytherium floridanum Hay 1922
G. †Nanosiren Domning and Aguilera 2008