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Ensis ensis
''Ensis ensis'', or the sword razor, is a razor clam, a marine bivalve mollusc in the family Pharidae. It lives buried in the sand and is found off the coasts of northwest Europe.
==Description==
The two valves that make up the shell of ''Ensis ensis'' are parallel-sided, narrow and curved. The adult shell can be up to ten centimetres in length. The valves are thin and rather brittle. The edges are parallel, tapering slightly towards the posterior and are off white with transverse bands of brown. The shell is sculpted with fine co-marginal lines and the annual growth lines can be seen. The inner side of the shell is white with a purplish sheen. The periostracum is olive green and the foot is reddish.〔(ARKive )〕〔(Marine Bivalve Shells of the British Isles )〕 Two identifying features are that the posterior adductor muscle is positioned some one and a half times its own length from the pallial sinus, and that the muscle that retracts the foot is posterior to the insertion point of the ligature. ''Ensis siliqua'' and ''Ensis arcuatus'' are two other rather similar species that can be found living in the same localities, but the shells of both of them are less curved than this species.〔(Conchological Society of Great Britain and Ireland )〕
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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