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Genus Monodon
- type genus of the Monodontidae
Genus Trichecus
- type and sole genus of the Trichechidae
Genus Dugong
- type genus of the Dugongidae comprising only the dugongs
Genus Hydrodamalis
- a genus of the family Dugongidae comprising only Steller's sea cow
Genus Otaria
- type genus of the Otariidae