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Tannuella
''Tannuella'' is a genus of helcionellid known from Lower Cambrian strata. It has a high, septate shell similar to that of hypseloconids such as ''Knightoconus'' . These genera were once considered ancestral cephalopods, but are more broadly assigned to the helconellids (or putatively the tergomyans); i.e. "Cambrian monoplacophora".〔 〕 ==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「Tannuella」の詳細全文を読む
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