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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 Landeroceras ： ウィキペディア英語版 Landeroceras ''Landeroceras'' is a straight shelled cyrtogomphoceratid from the Middle Ordovician Big Horn dolomite of Wyoming. The shell of ''Landeroceras'' is a subcylindrical brevicone with the siphuncle on one side, determined as ventral. Siphuncle segments are short and well expanded into the chambers. Connecting rings are thick, septal necks cyrochoanitic to recumbent, bullettes markedly swollen. ''Landeroceras'' is at the end of a small offshoot within the discosorid family Cyrtogomphoceratidae that also includes ''Cyrtogomphoceras'', and not in the line which gave rise to the Phragmoceratidae. ==''References''== *Flower, R H and Teichert, C., 1957. The Cephalopod Order Discosorida. University of Kansas Paleontological Contributions. Mollusca, Article 6, pp 1-144. * Teichert C. 1964. Nautiloidea -Discosorida, Treatise on Invertebrate Paleontology, Part K. Teichert and Moore eds. 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「Landeroceras」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.