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Abra alba
''Abra alba'' or the white furrow shell is a species of bivalve mollusc in the Semelidae family. It occurs in the north eastern Atlantic Ocean and the Mediterranean Sea, where it lives on the floor in shallow areas buried in soft sediments.〔
==Description==
''Abra alba'' can grow to up to long but a more usual size is 1.5 centimetres. It has a pair of thin brittle valves that are translucent, semi-shiny and a dirty white colour with a pale brown periostracum. The shape is roughly oval and the posterior and anterior dorsal margins are almost straight and slope to rounded ends. Both margins are smooth and the anterior margin is a little longer than the posterior one. The valves have a sculpture of fine concentric lines and the growth stages of the animal are visible. The interior of the valves is somewhat glossy and the adductor muscle scars may be visible. The small brown ligament that holds the valves together is exterior.〔(Marine Bivalve Shells of the British Isles ). ''Natural Museum Wales''. Retrieved August 8, 2011.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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