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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 Sactorthoceratidae ： ウィキペディア英語版 Sactorthoceratidae The Sactorthoceratidae comprise Orthocerataceaen genera with a subcentral suborthochoanitic siphuncle composed of slightly expanded segments and free of organic deposits. The camerae (chambers) of the phragmocone (chambered portion) likewise have organic deposits that are typically retarded or sparse. ==Discussion== The family, Sactorthoceratidae, was established by Rousseau Flower in 1946, based on the genus ''Sactorthoceras''. In 1962 Flower pointed out the problem of defining the Sactorthoceratidae based on ''Sactorthoceras''; there being three species groups within the genus: those with (1) short camerae and rather short tubular septal necks, (2) long camerae and slightly expanded siphuncle segments, (3) typically tubular siphuncle segments that are rapidly contracted at the septal foremina. In defining the Sactorthceratidae, the second group with slightly expanded segments was considered. However the type species ''S. goniaseptum'' belongs to the third group, with contracted segments. Recent classification includes ''Braulioceras'', ''Cartersoceras'', ''Centroonoceras'', ''Glenisteroceras'', ''Leptoplatophrenoceras'', ''Murrayoceras'', ''Sactorthoceras'', ''Scipioceras'', ''Sigmocycloceras'', ''Wennanoceras'', and ''Wolungoceras'', with the Sactorthoceratade expanded well beyond the composition in the Treatise (1964), consisting then only of ''Sactorthoceras'', ''Centroonoceras'', and ''Sigmocycloceras''. Among genera now included in the Sactorthoceratidae, ''Glenisteroceras'' and ''Wolungoceras'' were included tentatively in the Troedssonellidae in the Treatise (Sweet, 1964); ''Cartersoceras'' and ''Murrayoceras'' in the Baltoceratidae in NMBM&MR Memoir 12 (Flower 1964). Flower (1964) classified ''Wolungoceras'' as an empty siphuncle baltoceratid. ''Cartersoceras'' and ''Murrayoceras'' were given (ibid) as rod-bearing baltoceratids. ''Braulioceras'', ''Leptoplatophrenoceras'', ''Scipioceras'', and ''Wennanoceras'' are more recent additions. 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「Sactorthoceratidae」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.