Definition of pen shell in English:

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pen shell

noun

A large wedge-shaped bivalve mollusc of warm seas which burrows into the seabed where it attaches itself by strong byssus threads.
  • Family Pinnidae: Pinna and other genera
Example sentences
  • Included are pen shells, pearl oysters and a young Tridacna.
  • Modern pinnoideans, or ‘pen shells,’ are shallowly to deeply endobyssate, equivalved, edentulous, ham-shaped bivalves with a single, slightly submerged, opisthodetic ligament.
  • Perfect for photography, the cave walls and rocky floor are filled with marine life, including pen shells and seahorses.
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