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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 Atrina rigida ： ウィキペディア英語版 Atrina rigida ''Atrina rigida'', commonly known as the rigid pen shell, is a bivalve mollusc found from the North Carolina coast through the West Indies and to Brazil. It has attracted research interest in studies of calcification in its nacre as well as other aspects of its ecology. ==Description== As is typical with the Pinnidae, the shell is elongated and wedge-shaped, coming to a point at the anterior end. There are fifteen or more ridges running lengthwise, and spines arise from these towards the posterior edge. The exterior of the shell is an olive brown. The interior is nacreous to about half its length, and there is a conspicuous scar in the center of the shell at the border of this area, where the posterior adductor is attached. The mantle of the animal is orange and does not fill the shell entirely. The similar ''A. seminuda'' has the adductor scar entirely within the nacreous area. ''A. rigida'' may grow to 30 centimeters in length, though typical specimens are somewhat shorter. it also produces perfect black pearl but after 20 years they can produce the pearl as natural. 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「Atrina rigida」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.