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DescriptionAcanthocardia aculeata has a solid, broadly oval, inequilateral shell, measuring up to 11.5 cm in length. The shell forms into 20-22 prominent radiating ribs, each of which carries a row of sharp spines down its centre. There are concentric rings covering the surface of the shell, which are well defined between the ribs. The shell margin is crenulate, with grooves extending throughout the inside of the valves.