I don't even know where to begin with this worm. I guess I'll start with the tame stuff...
It's a large predatory species, Eunice aphroditois, that can get as large as three meters long, though most specimens measure in at around one meter. It's actually one of the largest worms on the planet. They haunt the rubble zones around coral reefs in the Indo Pacific, coming out at night in search of live fish.
So, why my hesitance in posting on this worm? I'll start with its common name: the Bobbit worm. The females of the species eat the ... uh, the ... um. The man parts ... the man bits of the male worm and feed it to their offspring.