Mammalia Linnaeus, 1758
Dugongidae Gray, 1821
Ishatherium Sahni & Kumar, 1980
Lophiodolus
Prorastomidae Cope, 1889
Protosirenidae Sickenberg, 1934
Pseudopalaeotherium Franzen, 1972
Rhytinidae
Trichechidae Gill, 1872
