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Macoma clams (Macoma nasuta and Macoma brota)

Macoma clams - Photo by Don RothausAre found in sand or mud and have wafer-thin, chalky-white shells and reach a maximum length of about 4 inches. They appear to have two necks, but these are actually in-current and ex-current siphons. Macomas are generally found 4 to 6 inches below the surface in the middle of the intertidal zone.