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| 	Dactylioceras  : ウィキペディア英語版 |   Dactylioceras
  | image = Dactylioceras_01.jpg | image_caption = ''D. athleticum'' | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | subclassis = Ammonoidea | ordo = Ammonitida | familia = Dactylioceratidae | subfamilia = Dactylioceratinae | genus = ''Dactylioceras'' | genus_authority = Hyatt, 1867 }} ''Dactylioceras'' was a widespread genus of ammonite from the Lower Jurassic period, approximately 172 million years ago (mya).〔 ==Etymology== The name ''Dactylioceras'' comes from the Greek ''dactyl'', meaning “finger”, and refers to the shell’s branching ribs.
  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「Dactylioceras」の詳細全文を読む
 
 
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