Pinnidae
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Pinnidae is a family of large saltwater clams sometimes known as pen shells. They are marine bivalve molluscs in the order Pterioida. The shells are fragile and have a long and triangular shape, and in life they are anchored in sediment using a byssus.
The family Pinnidae includes the fan shell, Atrina fragilis, and Pinna nobilis, the source of sea silk.
[edit] Genera
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