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DescriptionCorbula gibba has a plump, broadly oval to triangular shell up to 15 mm long. It is inequivalve, the right valve is very much larger and more convex than the left, which fits snugly into it, leaving a considerable margin of the right valve bare. The posterior margin is slightly truncate. Both valves of Corbula gibba are sculptured with coarse, concentric grooves and ridges, the left valve additionally having faint radiating lines. The beaks are turned inward and touching. The shell is dull white to cream, the interior is white with a faint pinkish or bluish tinge, sometimes with blotches of yellow. The pallial line is very faint and there is a slight posterior indentation or sinus.