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''Aegocrioceras'' is an extinct ammonite genus of cephalopod from the Lower Cretaceous included in the Ammonitida. It is known from northern Europe. ''Aegocrioceras'' is coiled in an open planispiral; whorls are strongly ribbed and bear spines on the outer shoulders (ventro-lateral) of the inner whorls. ''Aegocrioceras'' is similar to the earlier Upper Valanginian ''Juddiceras'' of Germany and to the later ''Shasticrioceras'' from the Barremian of California and Japan. ''Aegocrioceras'' was placed in the "Crioceratidae" (Ancyloceratidae, Crioceratinae) in Part L of the American Treatise on Invertebrate Paleontology published in 1957. Since then it has been reassigned to the Aegocrioceratidae which is included in the superfamily Protancyloceratoidea. ==References== W.J Arkell, et al. 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press. *(''Aegocrioceras'' ) in the Paleobiology Database. 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「Aegocrioceras」の詳細全文を読む スポンサード リンク
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