Dugongidae

• Family Dugongidae
  • Genus †Anisosiren
  • Genus †Caribosiren
  • Genus †Indosiren
  • Genus †Lentiarenium
  • Genus †Kaupitherium^[2]
  • Genus †Paralitherium
  • Genus †Priscosiren^[3]
  • Genus †Prohalicore
  • Genus †Sirenavus
  • Subfamily †Halitheriinae
    • Genus †Halitherium (nomen dubium)
  • Subfamily Dugonginae
    • Genus †Bharatisiren
    • Genus †Callistosiren^[4]
    • Genus †Crenatosiren
    • Genus †Corystosiren
    • Genus †Culebratherium
    • Genus †Dioplotherium
    • Genus †Domningia
    • Genus Dugong
      • Species Dugong dugon, dugong
    • Genus †Italosiren^[5]
    • Genus †Kutchisiren
    • Genus †Nanosiren
    • Genus †Norosiren
    • Genus †Rytiodus
    • Genus †Salwasiren^[6]
    • Genus †Xenosiren
  • Subfamily †Metaxytheriinae
    • Genus †Metaxytherium
  • Subfamily †Hydrodamalinae
    • Genus †Dusisiren
    • Genus †Hydrodamalis
      • Species †Hydrodamalis cuestae
      • Species †Hydrodamalis spissa^[7]
      • Species †Hydrodamalis gigas, Steller's sea cow

The genera Eosiren, Eotheroides, and Prototherium have been assigned to Halitheriinae in the past, but recent cladistic analysis recovers these genera as basal to the clade formed by Trichechidae and Dugongidae. Moreover, Halitheriinae is paraphyletic with respect to Dugonginae and Hydrodamalinae, and further use of the name should be discontinued because the type genus is based on a non-diagnostic tooth.^[8]