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Belemnitella bulbosa : ウィキペディア英語版 | Belemnitella bulbosa
''Belemnitella bulbosa'' is a species of belemnite from the Late Cretaceous of North America. It is known only from two localities - the Pierre Shale and Fox Hills Formations. ''B. bulbosa'' had a slender somewhat cylindrical rostrum (guard) with a slightly expanded front opening. Like other members of the genus ''Belemnitella'', it had a dorsal ridge on the rostrum. The phragmocone is about the same size or slightly longer than the rostrum and has an oval cross-section. ==References==
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「Belemnitella bulbosa」の詳細全文を読む
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