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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 Worthenia ： ウィキペディア英語版 Worthenia Worthenia is a genus of fossil sea snails, an extinct marine gastropod genus found in the fossil record. This genus is primarily found in rocks formed during the Devonian to Triassic periods (416 million to 200 million years ago) from the central areas of North America. ''Worthenia'' was named for the paleontologist Amos Henry Worthen who lived 1813 - 1888.〔''National Audubon Society Field Guide to Fossils'' (408)〕 ''Worthenia'' species have a "turban-shaped shell in which a raised ridge follows the margin of the whorls. Small nodes occur along the ridge, and the opening of the shell is oval and large."〔"(Worthenia )." ''Encyclopædia Britannica''. 2010. Encyclopædia Britannica Online. 04 Nov. 2010.〕 ==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「Worthenia」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.