Rare, 3.1" Ptychopyge Trilobite - St. Petersburg, Russia

This is a 3.1" long example of a rare Ordovician trilobite (Ptychopyge lesnikovae) from the Putilovo Quarry in the St. Petersburg region of Russia. Not only is it rare, but it's a nice example being laid out almost perfectly prone with only about 3-4% shell restoration.