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| image = | color = rgb(211,211,164) | phylum = Mollusca | classis = Cephalopoda | ordo = Ammonitida | superfamilia = Eoderocerataceae | familia = Polymorphitidae | genus = ''Dayiceras'' | genus_authority = Spath, 1920 | subdivision_ranks = Species | subdivision = None Cataloged }} ''Dayiceras'' is a finely ribbed polymorphitid eoderoceratacean ammonoid cephalopod from the Jurassic, named by Spath in 1920. The shell is evolute, coiled such that all whorls are exposed. The whorl section is compressed such as to be higher than wide. A row of fine tubercles runs along the middle of the outer rim, the venter. ==Distribution== Jurassic of Canada 〔 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「Dayiceras」の詳細全文を読む スポンサード リンク
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