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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 fragilis ： ウィキペディア英語版 Atrina fragilis The fan mussel, ''Atrina fragilis'', is a species of large saltwater clam, a marine bivalve mollusc in the family Pinnidae, the pen shells. The fan mussel is one of the largest (30 to 48 cm long) European bivalve molluscs. It is one of the rarest species of marine mollusc in the United Kingdom (UK). ==Description== The shell of the fan mussel tapers to a point at the umbos, and is very brittle. It is yellowish to dark brown with blackish patches. The two valves are equal and triangular in outline, with prominent gapes. The shell surface has a sculpture of concentric lines and 8 to 12 ribs, which may have fluted spines. Shells can reach 48 cm in length, and the largest individuals may be 10 to 12 years old. 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 fragilis」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.