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Wutinoceras : ウィキペディア英語版
Wutinoceras

''Wutinoceras'' is a genus of now extinct nautiloid cephalopod of the Wutinoceratidae family. It exhibits orthoconic actinocerids with ventral siphuncles composed of broadly expanded segments (Flower 1957,〔Memoir 2, Studies of the Actinocerida, New Mexico Bureau of Mines and Mineral Resources〕 1968〔Memoir 19, The First Great Expansion of the Actinoceroids, New Mexico Bureau of Mines and Mineral Resources〕)
==Distinguishing Characters==
Wutinoceras, as with its family the Wutinoceratidae, has a reticulate canal system within the siphuncle, distinguishing it from later forms with arcuate canal systems. Septal necks, components of the siphuncle that project from the back side of the septa, are cyrtochoanitic (outwardly curved) and may be recumbent. Connecting rings are thick, reflective of the ancestral form.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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