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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 Domatoceras ： ウィキペディア英語版 Domatoceras ''Domatoceras'' is a nautiloid genus and member of the Grypoceratidae from the Pennsylvanian and Permian with a wide spread distribution. The shell of ''Domatoceras'' is evolute, coiled with whorls touching but not overlapping, some growing to be moderately large. Whorl section sub quadrate, higher than wide. Sides essentially straight to slightly bowed and slightly convergent on a broad slightly arched venter on the outer rim. Shoulder are narrow but rounded. Chambers are short but lengthen slightly before the mature living chamber, septa close spaced, sutures form broad shallow lateral and ventral lobes and sharp ventro-lateral saddles. The dorsum in slightly impressed (indended) where it rides over the previous whorl. The siphuncle is subventral, located between the center and the ventral margin and, where known, slightly expanded so as to be longitudinally spindle shaped. ==References== * Bernhard Kummel 1964. Nautiloidea-Nautilida Treatise on Invertebrate Paleontology. Geological Society of America and University of Kansas Press. 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「Domatoceras」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.