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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 Goldringia ： ウィキペディア英語版 Goldringia ''Goldringia'' is an extinct nautilid of the Rutoceratidae family that lived during the Middle Devonian. It is known from New York, Ohio, and Indiana in the United States. ''Goldringia'', named by Rousseau Flower in 1945, has a gyroconic shell, coiled so as whorls do not touch. The cross section is slightly broader than high; the dorsum on the inside curvature is flatter than venter on the outside curvature. The siphuncle is ventral, tubular and free of organic deposits. The shell is encircled periodically by crenulate frills, each of which is bent apically so as for form a well defined hyponomic sinus, but are without spoutlike or spinose projections. ''Halloceras'', from the Lower Devonian, is a similar, gyroconic rutoceratid. ==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「Goldringia」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.