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Durotrigensia : ウィキペディア英語版 | Durotrigensia
''Durotrigensia'' is a genus of ammonites (Ammonitida) in the perisphinctoid family Parkinsoniidae. ''Durotrigensia'' is sometimes considered a subgenus of ''Parkinsonia'' and is related also to ''Oraniceras'' and ''Okribites''. These cephalopods lived during the Bajocian stage of the Middle Jurassic some 170 to 164 million years ago. ==Description== These large to giant ammonites have sharp and finely ribbed inner whorls and smooth outer whorls, without tubercles or lappets.
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「Durotrigensia」の詳細全文を読む
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