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Black dragonfish
The black dragonfish looks like the grimmest of fairy-tale villains, with a long, black body and terrifying, fang-like teeth.
It is a deep-sea fish, living as much as 2000m below the surface of the Atlantic Ocean, and is uniquely adapted to the darkness, cold and extreme pressure found at such depths.
It eats marine invertebrates and fish. To lure them, the female dragonfish has a barbel: a thread-like organ that dangles from her chin, with a luminescent blue tip. Adult fish can be 48cm long, with oversized jaws that allow them to swallow huge prey items.
They also have light-emitting organs called photophores scattered across their heads and bodies. These help the fish to find prey, communicate and hide from larger predators.
All this is true of female black dragonfish, but not of males. They are just 5cm long, dark brown and toothless with no functioning gut. Fishermen encounter females when they swim upwards at night to hunt, but males remain in the deep.
