Classification of Domning 1994
Fm. Sirenia Illiger 1811 [sirenian]
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Fm. Trichechidae Gray 1821 [manatee]
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Subfm. †Miosireninae Abel 1919
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Fm. Trichechinae Gray 1825
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G. †Potamosiren Reinhart 1951
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†Potamosiren magdalenensis Savage 1951
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Invalid names: Metaxytherium ortegense Kellogg 1966 [synonym]
G. Trichechus Linnaeus 1758 [manatee]
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Trichechus inunguis Natterer 1883 [Amazonian manatee]
Trichechus senegalensis Link 1795 [West African manatee]
Or. Sirenia Illiger 1811 [sirenian]
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Fm. Dugongidae Gray 1821 [dugong]
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Subfm. Dugonginae Gray 1821
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G. †Corystosiren Domning 1990
G. †Dioplotherium Cope 1883
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†Dioplotherium allisoni Kilmer 1965
†Dioplotherium manigaulti Cope 1883
G. †Xenosiren Domning 1989
Invalid names: Rytiodontinae Kretzoi 1941 [synonym]
Fm. †Halitheriinae Gill 1872
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G. †Eosiren Andrews 1902
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†Eosiren abeli Sickenberg 1934
†Eosiren libyca Andrews 1902
†Eosiren stromeri Abel 1913
G. †Metaxytherium de Christol 1840
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†Metaxytherium calvertense Kellogg 1966
†Metaxytherium floridanum Hay 1922
†Metaxytherium krahuletzi Depéret 1895
†Metaxytherium medium Desmarest 1822
†Metaxytherium serresii Gervais 1847
†Metaxytherium subapenninum Bruno 1839
G. †Prototherium de Zigno 1887
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†Prototherium intermedium Bizzotto 1983
†Prototherium veronense de Zigno 1875
Subfm. †Hydrodamalinae Palmer 1895
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G. †Dusisiren Domning 1978
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†Dusisiren dewana Takahashi et al. 1986
†Dusisiren jordani Kellogg 1925
G. †Hydrodamalis Retzius 1794 [Steller's sea cow]
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†Hydrodamalis cuestae Domning 1978 [Cuesta sea cow]
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Invalid names: Hydrodamalis spissa Furusawa 1988 [synonym]
†Hydrodamalis gigas Zimmermann 1780 [Steller's sea cow]