Classification of Domning and Pervesler 2012
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 medium Desmarest 1822
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Invalid names: Halitherium cordieri de Christol in de Blainville 1844 [synonym], Metaxytherium catalaunicum Pilleri et al. 1989 [synonym], Metaxytherium cuvierii de Christol 1832 [synonym], Metaxytherium petersi Abel 1904 [synonym]
Invalid names: Thalattosiren Sickenberg 1928 [synonym]