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→Orders and Families
===Orders and Families===
===Orders and Families===
====[[Squaliformes]]====
====[[Squaliformes]]====
Dogfish; order representing 7 families and 113 species of shark, with the spiny dogfish possibly the most abundant fish of any kind in the world's oceans.
Dogfish; order representing 7 families and 113 species of shark, with the spiny dogfish possibly the most abundant fish of any kind in the world's oceans. They are characterized by a lack of an anal fin, and range in size from 7.5 inches (Dwarf lanternshark, ''Etmopterus perryi'') to 21 feet (Greenland shark, ''Somniosus microcephalus'').
*Bramble sharks (Echinorhinidae)
*Bramble sharks (Echinorhinidae, 2 species)
*Dogfish (Squalidae)
*Dogfish (Squalidae, 20 species)
*Roughsharks (Oxynotidae)
*Roughsharks (Oxynotidae, 5 species)
====[[Hexanchiformes]]====
*Gulper Sharks (Centrophoridae, 15 species)
*Frilled sharks (Chlamydoselachidae)
*Lantern Sharks (Etmopteridae, 51 species)
*Cow sharks (Hexanchidae)
*Sleeper sharks (Somniosidae, 18 species)
*Kitefin sharks (Dalatiidae, 10 species)
====[[Hexanchiformes]]====
Deep-water sharks, identifiable by the presence of six or seven gill slits (cow sharks); or a shape reminiscent of an eel (frilled sharks)
*Frilled sharks (Chlamydoselachidae, 2 species)
*Cow sharks (Hexanchidae, 3 species)
====[[Pristiophoriformes]]====
====[[Pristiophoriformes]]====
*Sawsharks (Pristiophoridae)
Sharks identified by a long snout bearing variably-sized teeth on either side, similar in appearance to [[sawfish]].
*Sawsharks (Pristiophoridae, 6 species)
====[[Squatiniformes]]====
====[[Squatiniformes]]====
*Angelsharks (Squatinidae)
Identified by their flattened, ray-like appearance, lack of anal fins, and the lower lobe of the tail fin longer than the upper lobe.
*Angelsharks (Squatinidae, 16 species)
====[[Heterodontiformes]]====
====[[Heterodontiformes]]====
*Bullhead sharks (Heterodontidae)
Sharks which have a characteristic pig-like snout, short face, and bovine-like ridges above the eyes. All species have a spine in front of their dorsal fins.
*Bullhead sharks (Heterodontidae, 9 species)
====[[Orectolobiformes]]====
====[[Orectolobiformes]]====
*Collared carpetsharks (Parascyllidae)
Carpet sharks, so-named for the intricate patterns resembling oriental carpeting. Most species are small bottom dwellers; the exception is the whale shark (Rhincodon typus), at up to 60 feet in length it is the largest living fish.
*Blind sharks (Brachaeluridae)
*Collared carpetsharks (Parascyllidae, 8 species)
*Wobbegongs (Orectolobidae)
*Blind sharks (Brachaeluridae, 2 species)
*Bamboosharks (Hemiscyllidae)
*Wobbegongs (Orectolobidae, 12 species)
*Zebra sharks (Stegostomatidae)
*Bamboosharks (Hemiscyllidae, 16 species)
*Nurse sharks (Ginglymostomatidae)
*Zebra shark (Stegostomatidae, 1 species)
*Whale shark (Rhiniodontidae)
*Nurse sharks (Ginglymostomatidae, 3 species)
*Whale shark (Rhiniodontidae, 1 species)
====[[Lamniformes]]====
====[[Lamniformes]]====
*Sandtigers (Odontaspididae)
Mackerel sharks. Most species identified by a robust appearance; all lack a nictating membrane over the eyes.
*Goblin shark (Mitsukurinidae)
*Sandtigers (Odontaspididae, 4 species)
*Crocodile shark (Pseudocarchariidae)
*Goblin shark (Mitsukurinidae, 1 species)
*Megamouth shark (Megachasmidae)
*Crocodile shark (Pseudocarchariidae, 1 species)
*Thresher sharks (Alopiidae)
*Megamouth shark (Megachasmidae, 1 species)
*Basking shark (Cetorhinidae)
*Thresher sharks (Alopiidae, 3 species)
*Mackerel sharks (Lamnidae)
*Basking shark (Cetorhinidae, 1 species)
*Mackerel sharks (Lamnidae, 5 species)
====[[Carcharhiniformes]]====
====[[Carcharhiniformes]]====
*Catsharks (Scyliorhinidae)
Ground or common sharks, characterized by a nictating membrane over the eyes; several species have been implicated in attacks on man.
*Finback catsharks (Proscylliidae)
*Catsharks (Scyliorhinidae, 150 species)
*False catsharks (Pseudotriakidae)
*Finback catsharks (Proscylliidae, 7 species)
*Barbelled houndshark (Leptochariidae)
*False catsharks (Pseudotriakidae, 4 species)
*Houndsharks (Triakidae)
*Barbelled houndshark (Leptochariidae, 1 species)
*Weasel sharks (Hemigaleidae)
*Houndsharks (Triakidae, 40 species)
*Requiem sharks (Carcharhinidae)
*Weasel sharks (Hemigaleidae, 8 species)
*Hammerhead sharks (Sphyrnidae)
*Requiem sharks (Carcharhinidae, 52 species)
*Hammerhead sharks (Sphyrnidae, 9 species)
== Behavior ==
== Behavior ==