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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 Acleistoceratidae ： ウィキペディア英語版 Acleistoceratidae The Acleistoceratidae, named by Flower in Flower & Kümmel 1950, is a family of oncocerids that contains genera characterized by depressed (or rarely compressed) exogastric brevicones and cyrtocones (Sweet, 1964 K398) that range from the Middle Silurian to the Middle Devonian. The siphuncle is broadly expanded, and in some actinosiphonate. The Acleistoceratidae are derived from ''Oncoceras'' (Oncoceratidae) through ''Amphycertoceras'', independently of the ''Oonoceras'' stock. The family is named for the genus ''Acleistoceras''. All told some 22 genera have been described. ==References== *Flower,R.H. 1950; Flower & Kümmel; A Classification of the Nautiloidea; Journal of Paleontology, Vol 24, no 5, pp604–610, Sept 1950 *Sweet, W.C. 1964; Nautiloidea-Oncocerida, in the Treatise on Invertebrate Paleontology, Part K Nautiloidea, 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「Acleistoceratidae」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.