Cetacea

Cetaceans Temporal range: Early Eocene – Present
humpback whale breaching
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Infraclass:	Eutheria
Superorder:	Laurasiatheria
Order:	Cetacea Brisson, 1762
Suborders
Mysticeti Odontoceti †Archaeoceti

Some Cetacea: 1- Bowhead Whale; 2- Orca; 3- Right Whale; 4- Sperm Whale; 5- Narwhal; 6- Blue Whale; 7- Rorqual; 8- Beluga

The order Cetacea are marine mammals that live in oceans, seas, and even a few rivers around the world. Whales, dolphins, and porpoises are part of this group. The study of cetaceans is called cetology.

Taxonomy

• Order Cetacea
  • Suborder Mysticeti: Baleen whales
    • Family Balaenidae: Right whales and Bowhead Whale
      • Bowhead Whale, Balaena mysticetus
      • Genus Eubalaena: Right whales
        • North Atlantic Right Whale, Eubalaena glacialis
        • North Pacific Right Whale, Eubalaena japonica
        • Southern Right Whale, Eubalaena australis
    • Family Balaenopteridae: Rorquals
      • Genus Balaenoptera
        • Blue Whale, Balaenoptera musculus
        • Fin Whale, Balaenoptera physalus
      • Humpback Whale, Megaptera novaeangliae
    • Family Eschrichtiidae
      • Gray Whale, Eschrichtius robustus
    • Family Neobalaenidae
      • Pygmy Right Whale, Caperea marginata
  • Suborder Odontoceti: Toothed whales
    • Family Delphinidae: Oceanic dolphins
    • Family Phocoenidae: Porpoises
    • Family Monodontidae
      • Beluga, Delphinapterus leucas
      • Narwhal, Monodon monoceros
    • Family Physeteridae: Sperm Whales
      • Sperm Whale, Physeter catodon
      • Dwarf Sperm Whale, Kogia sima
      • Pygmy Sperm Whale, Kogia breviceps
    • Superfamily Platanistoidea: River dolphins

Wikibooks Dichotomous Key has more about this subject:

Cetacea