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''Urakawites'' is an extinct Ammonite from the Upper Cretaceous (Campanian) of Japan, Sakhalin, Russia, British Columbia, Canada and possibly Germany and Angola. ''Urakawites'' is placed in the family is Pachydiscidae. ''Urakawites'' is characterized by a bituberculate (meaning it has two rows of tubercles on either side), strongly ribbed, moderately compressed shell. ==References== * Arkell, et al., 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology Part L. Geol Soc of America and Univ Kansas Press. R.C. Moore ed. * Matsumoto, T. 1955. The bituberculate pachydiscids from Hokkaido and Saghalien. Studies on the Cretaceous ammonites from Hokkaido and Sakhalin 8. Memoirs of the Faculty of Science, Kyushu University, Series D, vol. 5, no. 3, pp. 153–184 * (''Urakawites rotalinoides'' (Yabe) ) 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「Urakawites」の詳細全文を読む スポンサード リンク
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