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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 Ankyloceras ： ウィキペディア英語版 Ankyloceras ''Ankyloceras'' is an Early Devonian cephalopod genus included in the oncocerid family Karoceratidae. The type species, ''Ankyloceras nesnayamiense'' named by Zhuravleva, 1974, comes from Nova Zemlya in Russia. Other species have been found in Japan, Morocco, and Russia. ==Morphology== The shell of ''Ankyloceras'' is cyrtoconic, exogastrically curved with a compressed to slightly depressed elliptical cross section more narrowly rounded ventrally than dorsally. Sutures form broad lateral lobes. The Siphuncle is marginal to the convex (ventral) side of shell. Septal necks in the type species are loxochoanitic, (inwardly slanting to the siphuncle) on marginal side, short recumbent on side facing interior. Connectng rings are expanded ventrally at the adapical end of each segment and dorsally at the adoral end. 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「Ankyloceras」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.