Classification of Heal 1973

Subfm. Dugonginae Gray 1821
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G. Dugong Lacépède 1799 [dugong]
Or. Sirenia Illiger 1811 [sirenian]
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Superfm. †Prorastomoidea Heal 1973
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Fm. †Prorastomidae Cope 1889
Fm. †Protosirenidae Sickenberg 1934
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G. †Protosiren Abel 1904
Invalid names: Eotherioididae Kretzoi 1941 [empty], Eotheroididae Heal 1973 [empty]
G. †Sirenavus Kretzoi 1941
Invalid names: Dugongoidea Heal 1973 [empty], Trichechoidea Gill 1872 [empty]
Subfm. †Halitheriinae Gill 1872
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G. †Anomotherium Siegfried 1965
G. †Halitherium Kaup 1838
G. †Thalattosiren Sickenberg 1928