Английская Википедия:Durotrigensia
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Шаблон:Short description Шаблон:Automatic taxobox
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.[1]
Description
These large to giant ammonites have sharp and finely ribbed inner whorls and smooth outer whorls, without tubercles or lappets.
References