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|image = Perisphinctes ammonite.jpg |image_caption = Exhibit from the Museum of Natural History in Berlin. |regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |ordo = Ammonitida |familia = Perisphinctidae |genus = ''Perisphinctes'' |genus_authority = Waagen, 1869 |subdivision_ranks = Species |subdivision = * ''P. abadiensis'' * ''P. boweni'' * ''P. arussiorum'' * ''P. choffati'' * ''P. gallarum'' * ''P. hetaerus'' * ''P. plicatilis'' * ''P. roubyanus'' * ''P. stenocyclus'' }} ''Perisphinctes'' is an extinct genus of ammonite cephalopod. They lived during the Jurassic Period and serve as an index fossil for that time period.〔(Index Fossils ), United States Geological Service, USA.〕 The ''Perisphinctes boweni'' ammonite was named after the English chemist and geologist E. J. Bowen (1898–1980). ==Distribution== Shells of species belonging to this genus have been found in the Jurassic of Antarctica, Argentina, Cuba, Ethiopia, France, Germany, India, Iran, Italy, Madagascar, Poland, Portugal, Russia, Saudi Arabia, Spain, Switzerland, the United Kingdom and Yemen. 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「Perisphinctes」の詳細全文を読む スポンサード リンク
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