Exceedingly Rare Cyrtometopus Russian Phacopid Trilobite

Description: 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 species Cyrtometopus. Its affinities with other Cheirurids such as Nieszkowskia (see my other offerings f examples) 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. This one is offered at a price that allows its acquisition by most collectors of trilobites from the region, affording an opportunity to add a member of the Cheirurids at a fraction of most examples offered. Notice too the small Brachiopod to the left of the right genal spine.