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Chauliodontidae (viperfish; subclass Actinopterygii, order Salmoniformes) A small family of deep-sea fish that have an elongated body, tapering down toward the tail, and a small dorsal fin that is not larger than the adipose fin but has a very long first dorsal ray that can be used as a lure. The upper and lower jaws have long, needle-like teeth, giving the head a ferocious appearance. There are about six species, some having a row of luminous organs along the belly.