This includes deep-water anglerfish, gulper eel, amphipods and dragonfish. A firefly and anglerfish are two example of bioluminescent organisms. The common names include humpback anglerfish, humpback blackdevil, and Johnson's anglerfish. Some species of anglerfish also display extreme sexual dimorphism. The anglerfish is a fish of the teleost order Lophiiformes (). The esca has compressed posterior and anterior crests, noted when distinguishing it from other anglerfish. The female anglerfish releases pheromones to attract tiny males. The American anglerfish is an ambush predator. This indicates some taxa of anglerfish use a polyandrous mating system. A type of Anglerfish, Frogfish are ambush predators with huge mouths. The name "anglerfish" derives from the species' characteristic method of predation. Using strong olfactory (or smell) receptors, the male searches until it locates a female anglerfish. Some anglerfish, like those of the Ceratiidae, or sea devils employ an unusual mating method. Some anglerfish, like those of the deep sea ceratioid group, employ this unusual mating method.