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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 Actinomorpha ： ウィキペディア英語版 Actinomorpha ''Actinomorpha'' is a valcouroceratid genus, Order Oncocerida, from the Middle Ordovician of central North America (Minnesota, Wisconsin), named by Rousseau Flower, 1943. The shell is breviconic, short and laterally compressed; the venter more narrowly rounded than the dorsum, having the effect of a modest keel in horizontal orientation. The shell is gibbous adorally, such that the body chamber is widest well behind the aperture. The siphuncle is ventral, which could also be indicative of a horizontal orientation in life, with broad, slightly inflated segments and continuous, radial, actinosiphonate, deposits. While ''Actinomorpha'' is a member of the Oncocerida; ''Actinoceras'' with its somewhat similar name belongs to the Actinocerida. ==''References''== * Sweet, Walter C. (1964). Nautiloidea-Oncocerida. Treatise on Invertebrate Paleontology ''Part K Mollusca 3''. Geological Society of America and University of Kansas Press. *(''Actinomorpha'' ) brief in Paleodb, 6/18/12 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「Actinomorpha」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.