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DescriptionA rigid star-shaped starfish with 5 short tapering arms. At the edge of each arm there is a double series of large square plates and a horizontal row of long pointed spines. The dorsal surface appears finely granular and is sand coloured, often with purple tips to the arms and a purple spot at the centre of the disc. 5-15cm across. This species is unlikely to be confused with any other, apart perhaps from Luidia sarsi which is much less common and has longer arms and a less rigid star-like shape.