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 The shell is subtriangular or oval, smooth, equivalve, inequilateral and 10-13 mm in length. The periostracum is a glossy olive or yellow-olive, whilst the shell is white/grey with bluish growth lines. The valves have bold concentric bands of grey/greenish yellow and fine radiating ribs. The anterior and posterior hinge lines are at right angles to each other. The margin of the shell is finely crenulate.


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©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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