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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Potamocorbula amurensis ： ウィキペディア英語版 Potamocorbula amurensis ''Potamocorbula amurensis'' is a species of small saltwater clam, a marine bivalve mollusc in the order Myoida. Common names include the overbite clam, the Asian clam, the Amur River clam and the brackish-water corbula. The species is native to marine and brackish waters in the northern Pacific Ocean, its range extending from Siberia to China, Korea and Japan. It has become naturalised in San Francisco Bay. ==Description== ''Potamocorbula amurensis'' grows to a length of about . The umbo is about half way along the hinge side of the shell and the shape of each valve is like a wide isosceles triangle with rounded corners. The right valve is rather larger than the left so that it overlaps a little at the margin, a fact that distinguishes this species from other similar clams. The surface is smooth with faint concentric sculpture that is parallel to the margin. The general colour is cream, yellowish or light brown. In young individuals, a dark-coloured periostracum covers the outer surface of each valve, but in older specimens this skin is largely worn away except for some wrinkled remnants at the valve margin. The part of the shell buried in the substrate is clean, whereas the exposed portion is often colonised by other organisms which stain it a dark colour. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Potamocorbula amurensis」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.