This giant(4 foot long) KILLER worm was discovered in an aquarium(Newquay’s Blue Reef Aquarium) in the UK. They found Barry, the giant killer worm, when they were trying to find out what was eating the prize fish and attacking the coral. Experts say that this worm can permanently numb a human with it’s sting.
This is a Eunice aphroditois! It’s (apparently) not exceedingly uncommon for them to be introduced to aquaria with live rocks, since even big fierce hunter worms start out as tiny wee baby worms. Obviously, aquarists are none too fond of them.
These guys are pretty cool, though.
For one, in the right lighting they iridesce like rainbow glitter.
Also, while they are omnivorous, they are ferocious predators. They have big scissor-like mandibles with which they grab their prey, sometimes with such force that they can cut their prey clean in half. On the upside, while they do use venom to subdue larger prey, I cannot find anything to substantiate the claim that their venom causes permanent numbness, other than the one quote in the Daily Mail article, from a curator who may not be particularly familiar with this species of worm.
Here’s an article with some more information on these little horrorterrors - and a video of how they hunt!