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Pinnidae - Pen Shells

The Saw-tooth Pen Shell

Pinna Or Pen Shells

Stiff Pen Shell: Atrina rigida (Lightfoot, 1786)

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Atrina rigida - Wikipedia

Common Shells of Honeymoon Island State Park Nature Center

Pen shells provided ancients byssal threads for fine sea silk – Susan Scott

Pen Shells of the Pinnidae Family

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