Sharks constitute the superorder Selachimorpha in the subclass Elasmobranchii in the class Chondrichthyes. The Elasmobranchii also include rays and skates; the Chondrichthyes also include Chimaeras. It is currently thought that the sharks form a polyphyletic group: in particular, some sharks are more closely related to rays than they are to some other sharks.

Sharks are split into eight orders:

  • Carcharhiniformes: ground sharks, the largest order of sharks, including requiem sharks, catsharks, swellsharks, houndsharks, weasel sharks and hammerheads
  • Heterodontiformes: bullhead sharks
  • Hexanchiformes: cow sharks and frilled sharks
  • Lamniformes: mackerel sharks, including thresher sharks
  • Orectolobiformes: carpetsharks
  • Pristiophoriformes: sawsharks
  • Squaliformes: bramble sharks, dogfish, sleeper sharks and lanternsharks
  • Squatiniformes: angelsharks


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Pages in category "Sharks"

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