Glycymeris bimaculataGlycymeris bimaculata is a marine bivalve mollusc in the family Glycymerididae.DescriptionShells of Glycymeris bimaculata reach a size of about. This species is one of the largest bivalves in the Mediterranean Sea. Shells have a round shape with quite variable markings.DistributionThis species is widespread in the Mediterranean Sea.