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Hercoceras
''Hercoceras'' is a trochoidally coiled nautiloid cephalopod placed in the nautilid family Rutoceratidae. These cephalopod lived i in the Eifelian age of the middle Devonian Period, which occurred 398-391 million years ago. Their shells have prominent lateral outgrowths in the form of spines and a high intraspecific variability. ==Systematic== The Paleobiology database places ''Hercoceras'' in the family Rutoceratidae in the order Nautilida, but according some authors it should not be considered an early nautilid. They place this genus in family the Hercoceratidae in superfamily Rutoceratoidea in order Oncocerida.
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「Hercoceras」の詳細全文を読む
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