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Aspinoceras
  ''Aspinoceras'' is an extinct heteromorph ammonite that lived during the Early Cretaceous.  The shell small; starts off with a few loosely wound whorls not in contact followed by a short moderately curved shaft ending in a broad hook. Surface covered with mostly fine, close spaced ribs, with periodic larger ribs. In general form it resembles ''Ancyloceras''. ''Aspinoceras'' has been found in upper Hauterivian - lower Barremian formations in Europe and California. ==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「Aspinoceras」の詳細全文を読む
 
 
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