Stomiiformes

The Stomiiformes are an order of deep-sea ray-finned fishes. This order includes families like the Stomiatidae, commonly known as dragonfishes, which are small, slender, and typically scaleless. These fish possess large mouths filled with long, sharp teeth and highly distensible stomachs, adapted for their deep-sea environment.12

A notable member of the Stomiiformes is the viperfish (genus Chauliodus). Viperfish are characterized by their long fangs that protrude from their jaws, used to secure prey. They also have luminescent organs along their sides, which may help attract other fish. While most viperfish are small, the largest species can reach about 30 centimeters (1 foot) in length.3