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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 Vermetus triquetrus ： ウィキペディア英語版 Vermetus triquetrus ''Vermetus triquetrus'' is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells. The genus ''Vermetus'' is very ancient. It is known in the fossil records from the Jurassic to the Quaternary (age range: from 164.7 to 0.0 million years ago). 〔 (Fossilworks )〕 ==Description== These sea snails are characterized by an unusual appearance and lifecycle. Young mollusks do not differ from other snails, as they have a conical, spiral shells. Later they fasten to the hard substrate with calcareous secretions and the shells takes the form of irregular tubes. The length of the shell is about and the roughly triangular tube section can reach up to 6 mm. The small operculum is concave. The small mollusk is a sessile gastropod lying and living permanently in its tube.〔 (Gastropods )〕〔(DORIS ) 〕 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「Vermetus triquetrus」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.