sharks are an elasmobranch fish, a subclass of cartilaginous fish. there are eight orders, or families, of sharks that are categorized by their biology !!
shark orders within elasmobranchii:
heterodontiformes(bullhead or horn sharks) - five gill slits, a dorsal fin with a strong spine and flat and sharp teeth in their mouth. an example of this is horn sharks.
orectolobiformes(carpetshark) - five gill slits, 2 spineless dorsal fins, an anal fin and spiracles(paired openings which take in water and ventilate the gills) near their eyes. an example of this is whale sharks.
lamniformes(mackrel sharks) - five gill slits, a large mouth with several rows of teeth, two dorsal fins, and anal fin and the ability to maintain a higher body temperature than the water around them. an example of this is great white sharks.
carcharhiniformes(ground sharks) - five gill slits, moveable eyelids which protect their eyes from injuries, two spineless dorsal fins, an anal fin and a large mouth with sharp teeth located behind their eyes. an example of this is hammerhead sharks.
squaliformes(dogfish sharks)- found in nearly every marine habitat, they have long snouts and a short mouth, five gill slits, two fins, and no anal fin. an example of this is spiny dogfish.
hexanchiformes(primitive sharks) - six or seven gill slits, one dorsal fin, an anal fin, thorny teeth and most live in deep cold water. an example of this is frilled sharks.
pristiophoriformes(sawsharks) - long snouts similar to saws, five or six gill slits, two dorsal fins, no anal fin, wide pectoral fins, transverse teeth and most of them live in tropical waters. an example of this is longnose sawsharks.
squatiniformes(angel sharks) - flattened bodies, a mouth with dermal flaps in front of a short snout, nasal barbels, eyes and a spiracle on the top of their head and no anal fin. an example of this is angel sharks.
*if any information is incorrect please tell me! i will correct it on here and on my research document :)
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