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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 Paraplectronoceras ： ウィキペディア英語版 Paraplectronoceras ''Paraplectronoceras'' is a very early nautiloid from the middle Late Cambrian, named by Chen and Qi, 1979, type species ''Paraplectronoceras pyriforme'', for small, endogastrically curved forms found in the upper Yenchou and Wanwankou members of the Fengshan Formation of northeastern China.〔Chen Jum-yuan and Curt Teichert. 1983. Cambrian cephalopods. ''Geology'' v.11, pp 647-650, November 1983.〕 The shell of ''Paraplectronoceras'' is laterally compressed with the dorsal side somewhat more narrowly rounded than the ventral, and is moderately to rapidly expanded. The siphuncle is small, ventral in position, without calcareous deposits. Segments are slightly expanded, pearshaped in early stage. Septal necks are short, curved in early stage, but straight in the adult.〔Chen Jun-yuan et al 1979. Late Cambrian Cephalopods of North China, Plectroncerida, Protactinocerida (Ord, Nov.) and Yanhecerida (Ord, Nov.) ''Acta Palaeontologica Sinica'', 1979-02 ()〕 Species of ''Paraplectronoceras'' along with another plectronoceratid, ''Lunanoceras longatum'', and the protacinocerid ''Wanwanoveras exigum'' have been found in Liaoning and Shandong privinces, in the lower part of the ''Changia Zone'', which is correlated with the earliest Trempealeauan of North America.〔Wen-tang Shang, Pei-ji Chem, A.R Palmer 2003. Biostratigraphy of China, Elsevier.()〕 ==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「Paraplectronoceras」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.