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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 Nereites irregularis ： ウィキペディア英語版 Nereites irregularis ''Nereites irregularis'' (formerly ''Helminthoida labyrinthica'' and ''Helminthoida crassa'') is a type of trace fossil found on sedimentary rocks. They are relatively small ''Nereites'' characterized by large numbers of closely packed deeply meandering trails that tend to coil.〔 The trails are usually horizontal and may be regular to irregular in guidance. The central tunnel is usually thicker than the envelope zone. In dense meanders, the envelope zone may touch or overlap, but it displays low-amplitude lobes in looser meanders. ''Nereites irregularis'' has not been matched with known modern organisms, but they are generally believed to have been grazing trails (pascichnia) made by worms.〕 == References == 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「Nereites irregularis」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.