Mamalyang pandagat

Ang mga mamalayang pandagat o marine mammals ang mga mamalya na nakatira sa dagat o katubigan. Ito ay nahahati sa apat na mga pangkat: ang cetacea(mga balyena, mga dolphin, mga porpoise at narwhal), mga pinniped( (mga seal, mga sea lion at mga walruses), sirenia (mga manatees at mga dugong), at mga fissiped na pangkat ng mga karniborang may hiwalay na digit(osong polar at dalawang species ng otter). Ang parehong mga cetacean at mga sirenian ay buong pantubig.

A Humpback whale (Megaptera novaeangliae), a member of order Cetacea

A Leopard seal (Hydrurga leptonyx), a member of suborder Pinnipedia of order Carnivora

Taksonomiya

A Polar bear (Ursus maritimus), a member of family Ursidae

A Sea Otter (Enhydra lutris), a member of family Mustelidae

Ang mga mamalya ay bumalik sa katubigan sa hindi bababa sa 9 na magkakahiwalay na mga linyang ebolusyonaryo: Cetacea, Sirenia, Desmostylia, Pinnipedia, Ursus maritimus (polar bear), Kolponomos (marine bear), Thalassocnus (aquatic sloth), Enhydra lutris (sea otter) atLontra feline (marine otter)). Ang tatlo sa mga linyang ito ay mga ekstintong Desmostylia, Kolponomos at Thalassocnus. Sa kasalukuyan, ang mga mamalyang pandagat ay kabilang sa 3 orden: Cetacea, Sirenia, o Carnivora.

• Order Cetacea
  • Suborder Mysticeti (baleen whales)
    • Family Balaenidae (right and bowhead whales) = 2 genera; four species
    • Family Neobalaenidae (pygmy right whale) = one species
    • Family Balaenopteridae (rorquals) = 2 genera; 8 species
    • Family Eschrichtiidae (gray whale) = 1 species
  • Suborder Odontoceti (toothed whales)
    • Family Physeteridae (sperm whale) = 1 species
    • Family Kogiidae (pygmy and dwarf sperm whales = 1 genera; 2 species
    • Family Monodontidae (narwhal and beluga) = two genera; two species
    • Family Ziphiidae (beaked whales) = 6 genera; 21 species
    • Family Delphinidae (oceanic dolphins) = 17 genera; 36 species
    • Family Phocoenidae (porpoises) = 2 genera; 6 species
    • Family Platanistidae (South Asia river dolphin) = 1 species
    • Family Iniidae (boto) 1 species
    • Family Lipotidae (Baji) probably extinct
    • Family Pontoporiidae (franciscana) = 1 species
• Order Sirenia (sea cows)
  • • Family Trichechidae (manatees) = 1 genus; 3 species
    • Family Dugongidae (dugongs) = 1 species
• Order Carnivora (carnivores):
  • • Family Mustelidae (otters) Enhydra lutris (sea otter) Lontra feline (marine otter)
    • Family Ursidae (bears) Ursus maritimus (polar bear)
  • Suborder Pinnipedia (sealions, walruses, seals)
    • Family Otariidae (fur seals and sea lions) = 7 genera; 16 species
    • Family Odobenidae (walrus) = 1 species
    • Family Phocidae (true seals) = 13 genera; 18 species