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Zemistephanus : ウィキペディア英語版 | Zemistephanus
''Zemistephanus'' is an extinct ammononite genus from the middle Jurassic of western North America and Western Australia, named by McLearn 1927. ''Zemistephanus'' is included in the sephanoceratoid family Otoitidae, which are characterized by shells that begin as barrel-shaped cadicones but which become planulate later in life. Body chambers are reduced in size and are excentric. Similar genera are ''Pseudotoites'' and ''Emileia'' ==References==
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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「Zemistephanus」の詳細全文を読む
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