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Oppelia
''Oppelia'' is a haploceratcean ammonite and type genus for the Oppeliidae that lived during the Middle Jurassic. Shells of ''Oppelia'' are involute with a small to moderate size umbilicus, bluntly rounded to sharp venter, and deeply impressed dorsum. Sides are generally smooth but may be variously ribbed on the outer flanks. Similar and related genera include ''Oxycerites'' and ''Oecotraustes''. ==Distribution== Jurassic of Germany, Greenland, India, Italy, Madagascar, Mexico, Poland, Spain and the United Kingdom
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「Oppelia」の詳細全文を読む
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