|
Braulioceras is a smooth, orthoconic orthocerid with very close spaced septa (around 8 over a length equal to the diameter of the shell) added to the Sactorthoceratidae in 2007. The type species, ''Braulioceras sanjuanense'' comes from the Middle Ordovician of the San Juan Formation, Argentine Precordiller. ''Braulioceras'' is very similar to ''Sactorthoceras''. The siphuncle is central, with orthochaonitic septal necks and segments which are slightly expanded between septa, giving it a beaded appearance. The thickness of the connecting rings is similar to that in ellesmerocerids. Endosiphuncular or cameral deposits are unknown. ''Braulioceras'' is distinguished from ''Sactorthoceras'' by its more closely central siphuncle, and expanded segments without the contractions at the ends as in the type species of ''Sactorthoceras'', ''S. gonioseptatum''. ==References== *(Paleobiology-db Braulioceras ) *B. Kröger, et al. 2007. Early orthoceratoid cephalopods from the Argentine Precordillera (Lower-Middle Ordovician). Journal of Paleontology 81(6):1266-1283 () * Rousseau Flower, 1962. Notes on the Michelinoceratida. Memoir 10, Part II, p. 30. New Mexico Bureau of Mines and Mineral Resources. 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「Braulioceras」の詳細全文を読む スポンサード リンク
|