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Cleoniceras
''Cleoniceras'' is a rather involute, high-whorled hoplitid from the Lower to basal Middle Albian of Europe, Madagascar, and Transcaspian region. The shell has a generally small umbilicus, arched to acute venter, and typically at some growth stage, falcoid ribs that spring in pairs from umbilical tubercles, usually disappearing on the outer whorls. ''Cleoniceras'' is included in the subfamily Cleoniceratinae. ==''Species''== This genus contains the species C. cleon and C. besairiei.
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「Cleoniceras」の詳細全文を読む
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