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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 Triloculina ： ウィキペディア英語版 Triloculina ''Triloculina'' is a protistan genus in the foraminiferal order Miliolida, included in the Quinqueloculininae. The test is three, chambers each a half coil in length. Early chambers, at least in the microspheric generation, in quinqueloculinan arrangement, later becoming triloculine with successive chambers added in planes 120 degrees apart. Only the final three chambers are visible externally. The aperture is terminal, at the end of the final chamber, with a bifid tooth in adult forms. As with the entire order, the test is composed of imperforate, porcelaneous calcite. The Pliocene to Recent ''Cruciloculina'' is very similar, except for having a different aperture, and is a likely derivative. ==References== * Joseph A. Cushman, 1950 Foraminifera, their classification and economic use (4th ed) Harvard University Press, Cambridge Mass. * Alfred R. Loeblich Jr and HelenTappan, 1964. Sarcodina Chiefly "Thecamoebians" and Foraminiferida; Treatise on Invertebrate Paleontology, Part C Protista 2. Geological Society of America and University of Kansas Press. 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「Triloculina」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.