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|regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |ordo = Ammonitida |subordo = Lytoceratina |familia = Lytoceratidae |subfamilia = Alocolytoceratinae |genus = ''Alocolytoceras'' | genus_authority = Hyatt, 1900 }} ''Alocolytoceras'' is a lytoderatid ammonite with whorls that pass during growth from round to oval, rounded-quadrate, or compressed; with about 10 deep constrictions per whorl, with as many as 20 sharp ribs in between. The shell is evolute. All whorls are visible from either side. ''Alocolytoceras'' belongs to the lytoceratid subfamily Alocolytoceratinae, which also includes ''Pachylytoceras'' and ''Pleurolytoceras''. It is known from the upper Lower Jurassic of Europe and the Himalaya. ==References== ;Notes ;Bibliography * 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「Alocolytoceras」の詳細全文を読む スポンサード リンク
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