scaphopod

/ˈskæfəˌpɒd/
noun
  1. A type of marine mollusk with a long, tubular, tusk-shaped shell that is open at both ends.
    • The scaphopod buries itself in sand and uses its tentacles to catch tiny prey.
    • Collectors often find scaphopod shells washed up on beaches after storms.
    • Scaphopods are sometimes called tusk shells because of their shape.
Synonyms
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