Bathydevius caudactylus swims through the ocean's midnight zone with a large gelatinous hood and paddle-like tail, and lights up with brilliant bioluminescence. The team published a description of ...

Monterey Bay Aquarium Research Institute scientists have discovered Bathydevius caudactylus, a new species of glowing sea slug that lives deep in the ocean.

Some of the planet's bioluminescent animals live in the deep ocean (although not all of them). Many exist in the twilight zone, the part of the ocean from 500 to 1,000 metres deep, which is always ...

The marine photographer who captured the footage said it could be the world's first recorded sighting of a black seadevil ...

Black seadevils can live up to 15,000 feet under the ocean surface ... or the "midnight zone," where animals live in constant darkness and the only light comes from bioluminescence.