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Mantelliceras : ウィキペディア英語版 | Mantelliceras
''Mantelliceras'' is an extinct ammonoid cephalopod genus belonging to the family Acanthoceratidae and type for the Mantelliceratinae,〔(Biolib )〕 that lived from the Late Albian to the late Cenomanian stage of the Late Cretaceous.〔 ==Description== ''Mantelliceras'' is characterized by a strongly ribbed, moderately involute shell with a moderately wide umbilicus, and rounded whorl section. The final whorl leaves inner whorls partly exposed. High standing ribs cross over the venter smoothly. Primary ribs arise from the ubilical wall. Secondaries, usually one per intervening space, arise higher on the flanks. Species of ''Mantelliceras'' are known to reach a diameter of about 13 centimeters.
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「Mantelliceras」の詳細全文を読む
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