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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 Angelinoceras ： ウィキペディア英語版 Angelinoceras ''Angelinoceras'' is a lituitid from the Middle Ordovician that starts off with an open spiral of about 1.5 strongly compressed whorls followed by an straight orthoconic section that continues to expand for a length about equal to the diameter of the coiled portion before retaining a more or less consistent diameter. The juvenile spiral portion has a deep indentation on the ventral side of the aperture for the water-jet funnel, known as a hyponomic sinus, that becomes broad and shallow in the straight-shelled adult portion. ''Angelinoceras'' is most likely derived from ''Holmiceras'' by a further opening of the initial spiral and a reduction in the expansion of the orthocone. ==''References''== *Flower, R. H. 1950. A Classification of the Nautiloidia. Jour Paleontology, V.24, N.5, pp 604–616, Sept. *Furnish & Glenister, 1964. Nautiloidea -Tarphycerida. Treatise on Invertebrate Paleontology Part K, Mollusca 3 ...Nautiloidea 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「Angelinoceras」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.