Purple Ribbon Worm A Predatory Marine Invertebrate with a Unique Hunting Strategy

The purple ribbon worm is a predatory marine invertebrate found within intertidal marine environments in the Pacific Ocean. In the East Pacific they can be found from the Aleutian Islands in Alaska, to Baja California, México. In the west Pacific, they can be found from Siberia to Japan. Purple ribbon worms have a long and elastic body. Their shape makes them look a lot like traditional terrestrial worms. Their coloration is typically purple-brown to bluish-purple on their upper surface, while their underside is cream-colored. They normally grow to a length of 5 inches (13 cm), but can sometimes reach lengths of up to

10 inches (25 cm). These worms inhabit rocky and muddy areas, specifically residing within the mid- to low-intertidal zones. They are known to live as long as 1.5 years. Ribbon worms are active predators. The purple ribbon worm targets a variety of segmented worms, including the mussel worm and other polychaetes. Purple ribbon worms lack long-range tracking and a worm reportedly normally cannot detect its prey until it physically bumps into it. Upon contact, the worm immediately deploys a highly specialized, extendable feeding apparatus

known as a proboscis, which can measure up to half the length of its body. It coils the proboscis around the prey. The tip of the proboscis is armed with a nail-like weapon called a stylet. The worm uses this stylet to stab its victim and release a potent neurotoxin. Even though a prey item like the mussel worm can be much larger and possesses powerful jaws, the purple ribbon worm can often successfully paralyze it. After stabbing, the ribbon worm briefly lets go to allow the neurotoxin to take effect, before swallowing the prey whole.

When purple ribbon worms are handled or picked up, most will constrict or break apart into several distinct pieces. This fragmentation is believed to serve as a mechanism for multiplication, as each broken piece retains the capacity to completely regenerate its missing parts and form a whole new, identical worm. For more marine facts, click the SUBSCRIBE button!