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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 Sirenites ： ウィキペディア英語版 Sirenites ''Sirenites'' is an ammonoid cephalopod from the Upper Triassic included in the Ceratitida, and type for the trachyceratid subfamily Sirenitinae. ''Sirenites'' has a compressed shell with distinct furrow running along the outer rim. Sides of the whorls are flattened to convex and covered with sigmoidal ribs that split on tubercles near the outer shoulder. there are two rows of tubercles on whorl sides and one on the inner, or umbilicle, shoulder. Although ''Sirenites'' is a ceratitid ammonoid, it suture is ammonitic. ==References== Arkell, et al., Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L, Mollusca 4, Geological Society of America. 1957. 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「Sirenites」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.