A broadly oval shell, equilateral with fine concentric grooves and clear growth stages, which can reach up to 3 cm in length. The umbones are midline and turned inwards and slightly forwards. The shell is a dirty white with a brown or greeny brown periostracum. The fused cardinal teeth of the left valve form a distinctive A-shape that extends more than half way down the hinge plate. The lateral cardinal teeth have distinct serrations along their interlocking faces..
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