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Carbactinoceras : ウィキペディア英語版 | Carbactinoceras
''Carbactinoceras'' is an Early Carboniferas (Visean) actincoceroid first found in Europe (Germany) related to ''Rayonnoceras'' but probably smaller. ==Description== ''Carbactinoceras'' shells are straight and generally unknown beyond the early growth stage. The siphuncle is large, central to subcentral; segments inflated, septal necks cyrochoantiic and recumbent. The endosiphuncular canal system observed is well developed with thin radial canals perpendicular to the central canal, and leading to a narrow seam along the connecting rings called a perispatium.
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「Carbactinoceras」の詳細全文を読む
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