Are you having trouble sleeping at night? Does your mind race with all manner of creepy crawlies and other unpleasantness? If your answer is yes, you may want to skip this article altogether, for we are about to introduce you to one of the most horrifying creatures living within the seabed: the bobbit worm.

Eunice aphroditois, or the bobbit worm, is a predatory polychaete worm that lives on the ocean floor at depths of 10 to 40 meters in the Indo-Pacific. The bobbit worm is omnivorous, but it has some special features that make it a particularly skilled and ruthless hunter. Growing to be as much as 3 meters in length, this clever worm buries itself in the substrate, which could be gravel, corals, sand, or even mud, leaving only its 5 antennae protruding from the sea floor. When these antennae are stimulated by passing prey, the bobbit worm bites with its razor sharp teeth, pulling its victim into the substrate to be consumed. This bite can be delivered with such speed that the prey is sliced in half! But it’s not just the bobbit worm’s bite you should fear; it is also covered in stinging bristles that can result in permanent numbness in the area of human flesh that touches it. Check out what happens when an equally fearsome predator — a lionfish — stumbles unwittingly across the lair of a bobbit worm.

Image via Wikipedia