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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 Valcouroceras ： ウィキペディア英語版 Valcouroceras ''Valcouroceras'' is the type genus for the Valcouroceratidae, a family in the nautiloid order Oncocerida named by Rousseau Flower, 1943, named for Valcour Island in Lake Champlain, between New York state and Vermont, where it was first discovered. The shell of ''Valcouroceras'' is strongly curved, more so than in ''Minganoceras]'', with the lower or ventral side on the outside curve. The body, or living, chamber is gibbous, broader near the middle than at the ends. The early growth stage is laterally compressed, higher than wide, then dorsally flattened, and finally depressed, wider than high. Septal necks of the siphuncle are straight, suborthochoanitic, nearly reaching he previous septa. Connecting rings start off thin but thicken in the later growth stages, which have well developed, internal radial, actinosiphonate deposits. ==''References''== * Sweet, Walter C. (1964). Nautiloidea-Oncocerida. Treatise on Invertebrate Paleontology ''Part K Mollusca 3.'' Geological Society of America and University of Kansas Press. *(''Valcouroceras'' ) brief in Paleobiology Database 6/16/12 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「Valcouroceras」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.