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Reference.org
Arca (bivalve)
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<p><i>Arca</i> is a genus of edible saltwater <a href="/facts/Clam/5BB6vVl7">clams</a> in the family <a href="/facts/Arcidae/reQPPaTd">Arcidae</a>, the <a href="/facts/Ark_clam/reQPPaTd">Ark Clams</a>. </p>