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Russian Trilobite Cybele bellatula Cybele bellatula Trilobite Order Phacopida, Family Encrinuridae Russian Phacopid Trilobite Geological Time: Lower Ordovician Size: 45 mm Fossil Site: Kunda Level deposits of the Wolchow River region near Saint Petersburg, Russia

Russian Ordovician trilobite Paraceraurus exsull

ピンもと:NYTimes.com

When Trilobites Ruled the World

When Trilobites Ruled the World / "A well-preserved trilobite specimen from Morocco that lived during the Devonian Period roughly 400 million years ago."

ロシア産三葉虫の至宝パラセラウルス/古生代オルドビス紀(5億500万 -- 4億4600万年前)/11.5cm(本体最長部カーブ計測)