Category:Sharks

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