Acrosterigma magnum

Acrosterigma magnum, or the magnum cockle, is a species of bivalve mollusc in the family Cardiidae. Acrosterigma magnum has a shell reaching a length of 38 – 48 mm. It can be found in Caribbean waters, ranging from the Florida Keys to Gulf of Mexico and northern Brazil. ...
Found on http://en.wikipedia.org/wiki/Acrosterigma_magnum
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