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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 Planorbulinacea ： ウィキペディア英語版 Planorbulinacea Planorbulinacea is a superfamily of rotalliid Foraminifera that has been extant since the Early Cretaceous (Berriasian), characterized by trochospiral tests, at least in early stage but which later may become uncoiled. The test wall is of perforate hyaline calcite, commonly optically radial in structure, with crystalographic c-axes perpendicular to the surface. The apertural face may be imperforate; the aperture interiomarginal and extraumbilical-umbilical to nearly equatorial in coiled forms, subterminal in uncoiled forms. The Planorbulinacea unites six families which are distinguished primarily by their morphological differences. ==References== *(Modern Foraminifera ) Barun K. Sen Gupta 1999 (ed). *(Planorublinacea ), Loeblich & Tappan, 1988. * Sarcodina Chiefly "Thecamoebians" and Foraminiferida; Treatise on Invertebrate Paleontology, Part C Protista 2. Geological Society of America and University of Kansas Press. A. R. Loeblich and H.Tappan, 1964. 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「Planorbulinacea」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.