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|image = Arietites bucklandi.jpg |image_caption = ''Arietites bucklandi'' |regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |ordo = Ammonitida |superfamilia = Psilocerataceae |familia = Arietitidae |genus = ''Arietites'' |genus_authority = Waagen, 1869 }} ''Arietites'' is a genus of massive, giant evolute, psiloceratacean ammonites in the family Arietitidae in which whorls are subquadrate and transversely ribbed and low keels in tripicate, separated by a pair of longitudinal grooves, run along the venter. Fossils are known world wide from the lower Sinemurian stage of the Lower Jurassic. Similar genera include ''Megarietites'' in which the keels are reduced and ''Epammonites'' in which the ribs are more closely spaced. ==References== * Arkell, et al. 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology. Geological Soc. of America and Univ. of Kansas Press. 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「Arietites」の詳細全文を読む スポンサード リンク
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