About Glycymeris glycymeris (Linnaeus, 1758)
This species, Glycymeris glycymeris, commonly called the dog cockle, has a shell that reaches up to 6.5 cm in length. The shell is thick and almost circular in outline, with the anterior hinge line curving more steeply downwards than the posterior. The shell's color varies, ranging from brown, yellow, or light purplish-red. It may be uniformly colored, or display irregular concentric zigzag patterns over a cream background. The periostracum is dark brown, velvety in texture, and forms a broad band around the shell margin. The interior of the shell is typically brown within the pallial line, and the inner surface has six to 12 teeth on either side of the beak. The dog cockle is a burrowing species that lives in shelly gravel on the ocean floor at depths up to 100 m (330 ft).
