Classification of Domning and Furusawa 1995
G. †Hydrodamalis Retzius 1794 [Steller's sea cow]
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†Hydrodamalis spissa Furusawa 1988 [Takikawa sea cow]
Or. Sirenia Illiger 1811 [sirenian]
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Fm. Dugongidae Gray 1821 [dugong]
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Fm. †Halitheriinae Gill 1872
Subfm. †Hydrodamalinae Palmer 1895