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A moon snail shell — almost spherical with a low spire — beside a small drilled clam on pale sand.

Moon Snail

Rounded, polished gastropods (family Naticidae) that leave the neat drilled hole on so many empty bivalves.

How to identify a moon snail

Almost spherical outline with a low spire and a wide crescent aperture. In the Shark Eye (Neverita duplicata) the dark spiral at the top forms the 'eye', and a callus partly fills the umbilicus.

  • Nearly spherical body whorl
  • Wide crescent aperture with a low spire
  • Dark spiral 'eye' at the apex and umbilical callus on the Shark Eye
Naticidae
Gastropod
East Coast · Gulf Coast
Sandy Intertidal · Sandy Subtidal
Beginner
  • Look for the drilled bevel-edged hole on empty bivalves nearby — that's the moon snail's calling card.
  • Sketch the dark spiral 'eye' at the top of the shell if your specimen is a Shark Eye.

More shell reading to pair with the moon snail

Hand-picked next steps — articles, field guides, and beaches that build directly on what you've just read.