Big bristle worm lived hidden in museum for years

Strange traces in an aquarium of the Karlsruhe Museum of Natural History kept biologists busy. Now the secret is revealed – and raises new questions.

It is probably a Bobbit worm that damaged the coral reef of the aquarium of the Karlsruhe Museum of Natural History for many years. The corpse of this undesirable host was discovered on 1 April. It is not a fish (it is a worm) of April.