classification of shark
Answers
Explanation:
There are over 350 species of sharks known worldwide. Sharks are classified as follows:
Kingdom Animalia
Phylum Chordata
SubPhylum Vertebrata
Class Chondrichthyes (cartilaginous fish)
Subclass Plagiostomi (sharks and rays: upper jaw hung from skulls and different kind of blood)
Superorder Selachimorpha (sharks: free upper eyelids, gill openings on the head, and pectoral fins separate from the side of the head)
Subclass Elasmobranchii (upper jaw that is not fused to the braincase, no swim bladder, advanced electroreceptive system, a spiracle, skin with placoid scales, teeth modified placoid scales, and 5-7 separate slit-like gill openings on each side of the body: there are about 600 species of sharks, skates, and rays)
Living sharks are divided into 8 Orders:
Squatiniformes (flat body, mouth at front, no anal fin) - angelsharks, monkfish
Pristiophoriformes (long snout, mouth underneath, no anal fin) - sawsharks
Squaliformes (short snout, mouth underneath, no anal fin) - dogfish and cookiecutter sharks
Carcharhiniformes (anal fin, 5 gill slits, 2 dorsal fins, no fin spines, mouth behind the eyes, nictitating eyelids) - ground sharks, including catsharks, swellsharks, shysharks, houndsharks, weasel sharks, requiem and hammerhead sharks
Lamniformes (anal fin, 5 gill slits, 2 dorsal fins, no fin spines, mouth behind the eyes, no nictitating eyelids) - mackerel sharks, including the basking, goblin, megamouth, great white, crocodile shark, thresher, porbeagles, mackerel sharks, sandtiger, and mako sharks
Orectolobiformes (anal fin, 5 gill slits, 2 dorsal fins, no fin spines, mouth in front of the eyes) - carpet sharks including the wobbegong, nurse, bamboosharks, blind, zebra, and whale shark
Heterodontiformes (anal fin, 5 gill slits, 2 dorsal fins, dorsal fin spines) - bullhead, horn sharks
Hexanchiformes (anal fin, 6-7 gills, 1 dorsal fin) - frilled and cow sharks - having six or seven gills on each side of the head.
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