• 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.

No anal fin	Flattened body, mouth at the front.	.	SQUATINIFORMES (Angelsharks)
	Body not flattened, mouth underneath	Snout long and saw-like	PRISTIOPHOROFORMES (Sawsharks)
		Short snout	SQUALIFORMES (Dogfish sharks)

Anal fin present	5 gill slits, 2 dorsal fins	No fin spines	Mouth extends behind the eyes	Nictitating eyelids	CARCHARHINIFORMES (Requiem sharks and hammerheads)
				No nictitating eyelids	LAMNIFORMES (Mackerel sharks)
			Mouth ends in front of eyes	.	ORECTOLOBIFORMES (Carpet sharks)
		Has dorsal fin spines	.	.	HETERODONTIFORMES (Bullhead sharks)
	6 - 7 gill slits, 1 dorsal fin	.	.	.	HEXANCHIFORMES (6-Gilled and 7-Gilled sharks)

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