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Agassiceras
''Agassiceras'' is a Lower Jurassic ammonite from the Sinemurian stage in Europe. ''Agassiceras'' belongs to the psiloceratacean family, Arietitidae, and is characterized by being compressed with a sharp venter and feeble straight ribs that may bifurcate near the umbilical edge. ==References==
*Arkell et al., 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology. Part L. Ammonoidea. Geological Society 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「Agassiceras」の詳細全文を読む
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