సముద్రపు ఆవు

• ORDER SIRENIA
  • Genus †Ishatherium
    • †Ishatherium subathuensis
  • Family †Prorastomidae
    • Genus †Pezosiren
      • †Pezosiren portelli
    • Genus †Prorastomus
      • †Prorastomus sirenoides
  • Family †Protosirenidae
    • Genus †Protosiren
      • †Protosiren minima
      • †Protosiren sattaensis
      • †Protosiren fraasi
      • †Protosiren smithae
  • Family Dugongidae
    • Genus †Nanosiren
      • †Nanosiren garciae
      • †Nanosiren sanchezi
    • Genus †Sirenotherium
      • †Sirenotherium pirabense
    • Subfamily Dugonginae
      • Genus Dugong
        • Dugong dugon, దుగోంగ్ (Dugong)
    • Subfamily †Hydrodamalinae
      • Genus †Dusisiren
        • †Dusisiren dewana
        • †Dusisiren jordani
        • †Dusisiren takasatensis
      • Genus †Hydrodamalis
        • †Hydrodamalis cuestae
        • †Hydrodamalis gigas, Steller's Sea Cow
  • Family Trichechidae
    • Subfamily †Miosireninae
      • Genus †Anomotherium
        • †Anomotherium langewieschei
      • Genus †Miosiren
        • †Miosiren canhami
        • †Miosiren kocki
    • Subfamily Trichechinae
      • Genus †Potamosiren
        • †Potamosiren magdalenensis
      • Genus Trichechus
        • Trichechus manatus, West Indian Manatee
          • Trichechus manatus manatus, Antillean Manatee
          • Trichechus manatus latirostris, Florida Manatee
        • Trichechus senegalensis, African Manatee
        • Trichechus inunguis, Amazonian Manatee
        • Trichechus "pygmaeus", Dwarf Manatee – validity questionable
    • Genus †Ribodon
      • †Ribodon limbatus

† extinct