Reconstruction 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 hide caption

itoggle caption Marianne Collins/ArtofFact

Sternman Scott Beede returns an undersized lobster while checking traps in Mount Desert, Maine. Robert F Bukaty/AP hide caption

itoggle caption Robert F Bukaty/AP