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This one half of a bivalve shell was seen washed up into the intertidal zone of a mostly sandy strand.
Same individual as the other
Two live Pacific Oysters on a rock at low tide. These are not native. This beach is seeded for lots of shellfish, and maybe oysters, too?
The Ostreidae, the true oysters, include most species of molluscs commonly consumed as oysters. Pearl oysters are not true oysters, and belong to the suborder Pterioida.