Eunice Aphroditois, The Bobbit Worm

Eunice aphroditois is found in warmer oceans around the world, including the Indo-Pacific and Atlantic.
In March 2009, the Blue Reef Aquarium in Newquay, Cornwall, discovered a bobbit worm in one of their tanks. The workers had seen the devastation caused by the worm, such as fish being injured or disappearing and coral being sliced in half, but didn't find it until they started taking the display apart in the tank.