Moray eels are large cosmopolitan eels of the family Muraenidae. There are approximately 200 species in 15 genera. The typical length of a moray is 1.5 m (5 ft), with the largest being the slender giant moray, Strophidon sathete, at up to 4 m (13 ft).
helena showing typical moray eel morphology: robust anguilliform shape, lack of pectoral fins and circular gill openings.]]The dorsal fin of the moray extends from just behind the head, along the back and joins seamlessly with the caudal and anal fins. Most species lack pectoral and pelvic fins, adding to their snake-like appearance. Their eyes are rather small; morays rely on their highly developed sense of smell, lying in wait to ambush prey.The body of the moray is patterned, camouflage also being present inside the mouth. Their jaws are wide, with a snout that protrudes forward. They possess large teeth, designed to tear flesh as opposed to holding or chewing.Moray eels have a second set of jaws in their throat called phary
Source: http://en.wikipedia.org/wiki/Moray Eel