翻訳と辞書 Words near each other ・ Gastrophrenic ligament ・ Gastrophryne ・ Gastrophrynoides ・ Gastrophrynoides borneensis ・ Gastrophysa ・ Gastrophysa polygoni ・ Gastrophysa viridula ・ Gastropila ・ Gastropila fumosa ・ Gastroplakaeis ・ Gastroplakaeis forficulatus ・ Gastroplakaeis rubroanalis ・ Gastroplakaeis schultzei ・ Gastroplakaeis toroensis ・ Gastropnir ・ Gastropod shell ・ Gastropoda ・ Gastropteridae ・ Gastropteron ・ Gastroptosis ・ Gastroptychus ・ Gastropub ・ Gastrosaccus spinifer ・ Gastroscan ・ Gastroschisis ・ Gastrosexuality ・ Gastrosplenic ligament ・ Gastrosporium ・ Gastrostomy ・ Gastrotheca 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 Gastropod shell ： ウィキペディア英語版 Gastropod shell The gastropod shell is part of the body of a gastropod or snail, a kind of mollusk or mollusc. The shell is an external skeleton or exoskeleton, which may serve for muscle attachment, but also for protection from predators, mechanical damage, dehydration, and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or the shell is reduced such that the body cannot be retracted within (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group. An excellent source for terminology of the gastropod shell is "How to Know the Eastern Land Snails" by John B. Burch now freely available at the Hathi Trust Digital Library.〔 == Formation of the shell == The gastropod shell has three major layers secreted by the mantle. The calcareous central layer, the ostracum, is typically made of calcium carbonate precipitated into an organic matrix known as conchiolin. The outermost layer is the periostracum which is resistant to abrasion and provides most shell coloration. The body of the snail contacts the innermost smooth layer that may be composed of mother-of-pearl or shell nacre, a dense horizontally packed form of conchiolin, which is layered upon the periostracum as the snail grows. 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「Gastropod shell」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.