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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 Arctoceras ： ウィキペディア英語版 Arctoceras ''Arctoceras'' is a ceratitid ammonoid genus from the Lower Triassic with a moderately narrow discoidal shell and ceratitic suture.〔Arkell et al 1957, Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L, R.C. Moore (ed), p L142 -L145 〕 The shell of ''Arctoceras'' is generally involute with compressed whorls that are much higher than wide, flattened sides, narrowly rounded ventral rim, and sutures with wide low saddles and simple serrated lobes.〔 ''Arctoceras'' was named by Hyatt, (1900).〔 The genotype ''Arctoceras polaris'' (Mojsisovics) comes from Spitsbergen. ''Arctoceras'' is the type genus of the Arctoceratidae which is a family in the Meekocerataceae, a superfamily within the Ceratitida.〔(Paleobiology Database -Arctoceras ) 12/10/09〕 Ceratitids are ammonoid cephalopods, mostly from the Triassic but with ancestral forms in the Upper Permian. Meekocerataceae sometimes appears as Meekoceratoidea to conform with a recent ruling of the ICZN regarding superfamily endings. ''Arctoceras'' has been reported from Canada, the United States, Russia, Australia, Afghanistan, and Malaysia.〔 ==''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「Arctoceras」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.