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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 Williamsoceras ： ウィキペディア英語版 Williamsoceras Williamsoceras is an endocerid that Rousseau Flower (1968) added to his Allotrioceratidae (Flower 1955) on the basis of having a vertical partition within the siphuncle, known as a ventral process, with inter-connecting tubule-like structures along its margin where intercepted by endocones. Three species are named and described (Flower 1968) from the Garden City limestone of Whiterockian age near Logan and northern Utah, including the genotype ''Williamsoceras adnatum''. Two other species come from the Juab limestone (Flower 1976) of near equivalent age in the southern Confusion Range in the Ibex area in western Utah. == Description== Of the five described species the siphuncle wall and phragmocone are known only from the genotype ''Williamsoceras adnatum''. The other four are known only from pieces of siphuncle which show only internal configurations, but closely resemble that of the genotype. ''Williamsoceras'' is characterized by a ventral process within the siphuncle that extends vertically from the bottom side, essentially bisecting the interior. The process is straight sided and narrow in the more forward part of the siphuncle, approaching the body chamber, and swells to a bulbous or teardrop shape in cross section closer to the apex of the siphuncle where it becomes draped by endocones. As the ventral process and endocones approach a crescent shape space is formed, known as the endosiphocone, the upper side being convex, the lower side concave. The septal necks, described only from the genotype, are macrochoanitic, extending 1.5 segments back from their origin. and is slightly sinuous in profile (Flower 1968, 1976) 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「Williamsoceras」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.