Exceedingly Rare Cyrtometopus Russian Phacopid Trilobite

Cyrtometopus clavifrons

Trilobites Order Phacopida, Suborder Cheirurina, Superfamily Cheiruroidea, Family Cheiruridae

Geologic Time: Lower Ordovician, Kunda Horizon

Size: 35 mm

Fossil Site: Wolchow River Region, Kunda Horizon, St. Petersburg region, Wolchow river, Russia

Rare Crytometopus Russian Phacopid TrilobiteDescription: Coming from the nearly half billion year old Middle Ordovician Kunda Level deposits of the Wolchow River region near Saint Petersburg, Russia, this is an example of a member of the Order Phacopida, Family Cheiruridae of the genus Cyrtometopus. Its affinities with other Cheirurids such as Nieszkowskia are apparent, but there are substantial differences as well. The trilobite itself is 35 mm long (measured along the curve) and 25 mm wide at the dramatically backswept pygidial spines. Notice the small Brachiopod to the left of the right genal spine. Also see: Russian trilobites.

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Rare Crytometopus Russian Phacopid Trilobite

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