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| image = Gasteropods - Ammonites - Orthosphinctes sp. . .JPG | image_width = 240px | image_caption = ''Orthosphinctes'' sp., from Montejunto (Portugal), at the Museu Nacional de História Natural, Lisboa | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | subclassis = Ammonoidea | ordo = Ammonitida | familia = Ataxioceratidae | genus = ''Orthosphinctes'' | genus_authority = | synonyms = | subdivision_ranks = Species | subdivision = * ''O. alternans'' }} ''Orthosphinctes'' is a genus of ammonites belonging to the order Ammonitida family Ataxioceratidae. They lived in the late Jurassic period, in the Kimmeridgian age, which occurred 155.7-150.8 million years ago. These shelled ammonoids were nektonic, fast-moving and carnivore. ==Fossils distribution== Jurassic of Algeria, France, India, Iran, Italy, Madagascar, Spain, 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「Orthosphinctes」の詳細全文を読む スポンサード リンク
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