Shells of worm snails, also known as vermetids, from a Waialua beach. Some people call these mollusks tube snails, but since the reef also hosts abundant species of tube worms, this name is confusing.

What's brightly colored, lives on shipwrecks, filter-feeds like a whale, and shoots webs like Spiderman? If you can't readily come up with an answer, that's okay: until now, such animals weren't known ...