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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 Valcouroceratidae ： ウィキペディア英語版 Valcouroceratidae The Valcouroceratidae is an oncocerid family from the middle and upper Ordovician, mainly of North America, consisting of genera characterized by exogastricly curved cyrtoconic and breviconic shells that change ontogeneticially from compressed to depressed or subtriangular and in which the siphuncle in ventral and actinosiphonate. ==Generic composition== The Valcouroceratidae comprises eight genera, three of which, ''Valcouroceras'', ''Augustoceras'', and ''Actinomorpha'', were named by Flower in 1943 and 1946 and five of which, ''Fayettoceras'', ''Kindleoceras'', ''Manitoulinoceras'', ''Minganoceras'', and ''Staufferoceras'', were named previously by Foeste between 1924 and 1938. Flower established the family Valcouroceratidae in 1945, based on Valcouroceras, which he named in 1943. All eight genera were included as late as 1950 where they rest today. 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「Valcouroceratidae」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.