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500 species
* There are more than 500 species of sharks split across thirteen orders, including several orders of sharks that have gone extinct:[24][25] * Carcharhiniformes: Commonly known as ground sharks, the order includes the blue, tiger, bull, grey reef, blacktip reef, Caribbean reef, blacktail reef, whitetip reef, and oceanic whitetip sharks (collectively called the requiem sharks) along with the houndsharks, catsharks, and hammerhead sharks. They are distinguished by an elongated snout and a nictitating membrane which protects the eyes during an attack. * Heterodontiformes: They are generally referred to as the bullhead or horn sharks. * Hexanchiformes: Examples from this group include the cow sharks and frilled sharks, which somewhat resembles a marine snake. * Lamniformes: They are commonly known as the mackerel sharks. They include the goblin shark, basking shark, megamouth shark, the thresher sharks, shortfin and longfin mako sharks, and great white shark. They are distinguished by their large jaws and ovoviviparous reproduction. The Lamniformes also include the extinct megalodon, Otodus megalodon. * Orectolobiformes: They are commonly referred to as the carpet sharks, including zebra sharks, nurse sharks, wobbegongs, and the whale shark. * Pristiophoriformes: These are the sawsharks, with an elongated, toothed snout that they use for slashing their prey. * Squaliformes: This group includes the dogfish sharks and roughsharks. * Squatiniformes: Also known as angel sharks, they are flattened sharks with a strong resemblance to stingrays and skates. * Echinorhiniformes: This group includes the prickly shark and bramble shark. Phylogenetic placement of this group has been ambiguous in scientific studies.[26] They are sometimes given their own order, Echinorhiniformes.[25]
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