lampshell

/ˈlæmpˌʃɛl/
noun
  1. A marine animal with a shell that looks like an ancient oil lamp, also called a brachiopod.
    • The lampshell uses a fleshy stalk to attach itself to the ocean floor.
    • We found a fossilized lampshell on the beach during our geology trip.
    • Unlike clams, a lampshell has a different internal structure and is not a true mollusk.