The flashlight fish is not alone in using bacteria as light factories. Similar organs housing bioluminescent bacteria are found in deep sea anglerfishes and ponyfishes, too. In fact, a 2016 study ...

The lanternfish is, by far, the most common deep-sea fish. Other deep sea fishes include the flashlight fish, cookiecutter shark, bristlemouths, anglerfish, viperfish, and some species of eelpout.