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Meekoceras
''Meekoceras'' is a ceratitid ammonite with a discoidal shell that lived during the Early Triassic Period. ==Description== ''Meekoceras'' is characterized by a compressed, discoidal, evolute or involute shell with flattened sides and narrow, flattened or rounded venter that is without keels or furrows. The surface is smooth or with lateral folds, but no subercles, spines, or spiral ridges. Umbilicus variable, body chamber short. Sutures ceratitic with smooth rounded saddles and serrated lobes.
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「Meekoceras」の詳細全文を読む
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