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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 Helcionopsis striata ： ウィキペディア英語版 Helcionopsis striata ''Helcionopsis striata'' is an extinct species of paleozoic monoplacophoran in the family Tryblidiidae. == Shell description == The shell is rather strongly convex, acuminate-ovate in outline, broadly and regularly rounded behind, pointed in front where the apex projects slightly beyond the margin of the aperture. The apex is incurved. The surface is marked by distinct, rounded, radiating lines, which in the outer half maintain an approximately equal size through bifurcation. There are about ten lines in 5 mm. The whole surface is with very fine concentric lines. Irregular wrinkles are marking stages of growth at intervals of 1 to 3 mm.〔 The length of the shell is 24.5 mm, width 19 mm and the height of the shell is 4.5 mm.〔 This species is closely related to the Upper Silurian ''Helcionopsis radiatum'', which is a little more convex, the anterior outline blunter and the apex more incurved.〔 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「Helcionopsis striata」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.