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''Hlawiceras'' is an extinct genus from a well known subclass of fossil cephalopods known informally as ammonites that lived during the Jurassic Period, which lasted from approximately 200 to 145 million years ago. ''Hlawiceras'' belongs to the family Stephanoceratidae,true ammonites, which is contained in the Stephanocerataceae. It is probably synonymous with the better known ''Garantiana'' ''Hlawiceras''(''Garantiana'') has an evolute discoidal shell with a subcircular cross section and close spaced transverse ribbing. ==References== * Classification of the Jurassic Ammonitina, D. T. Donovan and J. H. Calloman 1981, in The Ammonoidea, edited by M.R. House and J.R. Senior; * Pictures of ''Garantiana'' ''Hlawiceras'') () 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「Hlawiceras」の詳細全文を読む スポンサード リンク
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