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Paraceraurus exsull
Coming from the nearly half billion year old Middle Ordovician Asery Level deposits of the Wolchow River region near Saint Petersburg, Russia, this is an example of a member of the Order Phacopida, Family Cheiruridae called Paraceraurus (formerly Cheirurus) exsull. These are very dramatic trilobites, with expansive genal and pygidial spines.
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