Chlamys gibba

This species is easily distinguished from C. linki because both valves are much more convex, it is much stronger and thicker, bears more ribs, and are usually larger. It is slightly inequivalve, equilateral, and is up to 5 cm in length. The shell itself is grey or white in color and is often splashed with grey-black, purple, crimson, orange and brown. Each valve is sculptured by 20-28 ribs that are broader, flatter, and closer together than in C. linki. The whole surface bears very fine concentric laminations or striae, which in worn specimens can only be seen in the grooves between the ribs. The ears are again sculptured, but are much less prominent than in C. linki as is the byssal notch. There are 2 ridges (for articulation) on either side of the prominent chondrophore. This species is uncommon. The valves tend to be very worn and often broken.