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Reference.org
Pinnidae
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<p>The Pinnidae are a <a href="/facts/Taxonomy_(biology)/Qkg8wuyw">taxonomic</a> <a href="/facts/Family_(biology)/qTrn6E8E">family</a> of large saltwater clams sometimes known as pen shells. They are <a href="/facts/Marine_(ocean)/8W8lYgjD">marine</a> <a href="/facts/Bivalve/IQDxHVc8">bivalve</a> <a href="/facts/Mollusc/1elgknsQ">molluscs</a> in the order <a href="/facts/Pteriida/WpV9UD14">Pteriida</a>. </p>