Support WBURThink Man-Sized Swimming Centipede — And Be Glad It's A FossilPlay02:06Download AudioChristopher JoyceMarch 11, 2015 ShareReconstruction of the giant filter feeder, scooping up a plankton cloud. Aegirocassis benmoulae was one of the biggest arthropods that ever lived. Family members include today's insects, spiders and lobsters. (Marianne Collins/ArtofFact)