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Atrina serrata (G. B. Sowerby I, 1825) Sawtooth Penshell |
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| Washed onto beach after northeaster, Little Talbot Island State Park, Duval County, Florida (about 260 mm.). When the above specimen was cleaned, a Palaemonid Shrimp Pontonia domestica [Atlantic Pen Shrimp] (about 25 mm. in length) was found living inside the shell - an example of commensalism. |
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