翻訳と辞書 Words near each other ・ Micklethwaite, Wetherby ・ Mickleton ・ Mickleton Halt railway station ・ Mickleton railway station ・ Mickleton, County Durham ・ Mickleton, Gloucestershire ・ Mickleton, New Jersey ・ Mickletown ・ Mickley ・ Mickley Green ・ Micko Krstić ・ Micko Larkin ・ Mickola Vorokhta ・ Mickowsee ・ Mickten ・ Mickwitzia ・ Micky ・ Micky & the Motorcars ・ Micky (Spanish singer) ・ Micky Adams ・ Micky Allan ・ Micky Arison ・ Micky Axton ・ Micky Bell ・ Micky Benning ・ Micky Block ・ Micky Bloor ・ Micky Boot ・ Micky Brennan ・ Micky Bretón Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Mickwitzia ： ウィキペディア英語版 Mickwitzia ''Mickwitzia'' is a genus of stem group brachiopods with punctate shells from the Cambrian period. Mickwitziid shells are composed of apatite (calcium phosphate). Punctae or tubes penetrate through multiple shell wall layers, and individual punctae often develop a single, axial phosphatic tube. Members of the genus appear to share characteristic shell microstructure in common with halkieriids such as ''Micrina'', and like the halkieriids, mickwitziids may not have been able to enclose their entire body within a bivalved shell. As such, mickwitziids represent a potentially critical intermediate fossil taxon linking Phylum Brachiopoda to another animal phylum, with both higher taxa appearing rather suddenly near the beginning of the Cambrian. The origins and functions of the tubes that penetrate mickwitziid shells are controversial. One hypothesis considers the tubes to represent marginal setae that became surrounded by phosphatic shell material. Another hypothesis suggests that the tubes represent conduits for the delivery of anti-predation or anti-fouling toxins to the shell surface. The two hypotheses are not necessarily mutually exclusive. ==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「Mickwitzia」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.