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''Oxycerites'' is an extinct ammonoid cephalopod belonging to the haploceratacean family, Oppeliidae, that lived during the Middle Jurassic. Shells of ''Oxycerites'' are involute, compressed and generally smooth with a sharply rounded venter on the outer rim, deeply impressed dorsum on the inner rim, and a small umbilicus. The living chamber takes up slightly more than half a whorl. ''Oxycerites'' grew to a diameter of at least 17.5 cm, about 7 inches. ''Oppelia'' and ''Oecotraustes'' are similar and closely related forms. ''Oppelia'' is smoother, ''Oecotraustes'' more strongly ribbed ==Distribution== Jurassic of Argentina, France, Germany, Iran, Madagascar, Russia, Saudi Arabia 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「Oxycerites」の詳細全文を読む スポンサード リンク
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