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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 Avilionella ： ウィキペディア英語版 Avilionella ''Avilionella'' is a Middle Ordovician tarphyceroid genus consisting of closely coiled, compressed shells with a small perforation in the center, shallow dorsal impression, and subventral tubular siphuncle with thin connecting rings. Chambers are very short, separated by closely spaced, dish-shaped septa. Coiling becomes loose in the mature, adoral, part of the shell. The subventral, tubular siphuncle along with the looser coiling in the mature portion of the shell and perforation at the center put ''Avilionella'' in the Plectoceratidae (Flower, 1984) rather than in the Barrandeoceratidae (Sweet 1964) where it had been placed earlier. It has been found the New York and Ontario. ==References== *Rousseau H. Flower, 1984. ''Bodeiceras''; a New Mohawkian Oxycone, with Revision of the Older Barrandeocerida and Discussion of the Status of the Order. Journal of Paleontology v. 58, no.6, pp 1372-1379, Nov. 1984. *Walter C Sweet, 1964 Nautiloidea-Barrandeocerida; Treatise on Invertebrate Paleontology, Part K Mollusca 3. 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「Avilionella」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.