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DescriptionAstropecten irregularis has a stiff flattened body. It can grow up to 20 cm in diameter. The dorsal surface appears finely granular. The under surface of this starfish is pale, however the upper surface can appear sandy, yellow orange, pink or brown. It often has purple tips at the end of each arm and a purple spot at the centre of the disc. At the edge of each arm there is a double series of large marginal plates. The upper marginal plates have a larger conical spine. It has pointed tube feet without suckers.No similar species occur in shallow water. Astropecten irregularis usually lies part buried in the sediment and maintains contact with the surface through the tips of the arms.