Arcinella arcinella

Arcinella arcinella, or the Caribbean spiny jewel box clam, is a species of bivalve mollusc in the family Chamidae. Arcinella arcinella has a shell reaching a size of about 55 mm. The shells of this common Caribbean species are pale brown in color with rows of pronounced nodules. The interior is white. These molluscs are suspension filter feeders....
Found on http://en.wikipedia.org/wiki/Arcinella_arcinella
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