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Shark is the naming term of all members of Selachimorpha suborder in the subclass Elasmobranchii, in the class Chondrichthyes. The Elasmobranchii also include rays and skates; the Chondrichthyes also include Chimaeras. The first shark-like chondrichthyans appeared in the oceans 400 million years ago,<ref>Template:Cite journal</ref> developing into the crown group of sharks by the Early Jurassic.<ref>Template:Cite journal</ref>

Listed below are extant species of shark. Sharks are spread across 557 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in alphabetical order. Also included is a field guide to place sharks into the correct order.

Cow and frilled sharks (2 Families)Edit

Dogfish sharks (7 families)Edit

Lesueur, 1818

Sawsharks (1 family)Edit

Angel sharks (1 family)Edit

Bullhead sharks (1 family)Edit

Mackerel sharks (7 families)Edit

Carpet sharks (7 families)Edit

Ground sharks (8 families)Edit

White, 2021 (Andaman smooth-mouth)

Alphabetic sortEdit

See alsoEdit

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ReferencesEdit

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