tridacna squamosa, bivalves are a large class of molluscs, also known as pelecypods. Sketch black contour isolated on white background. Can be used for fabrics, wallpapers. Vector Shutterstock .eps vector - tridacna squamosa, bivalves are a large class of molluscs, also known as pelecypods. Sketch black contour isolated on white background. Can be used for fabrics, wallpapers. Vector - ID: 1125045434