This Specimen has been sold.
2.5" Asaphus Punctatus Trilobite - Russia
This is a beautiful, 2.5" example of the stalked eyed trilobite Asaphus punctatus. It comes from the Gostlitsy Quarry in the St. Petersburg region of Russia. It's nice and prone and there is very little restoration on the specimen, just some thing crack fills around where the shell fractured during collection, primarily on the tail.
Trilobites were a very diverse group of extinct marine arthropods. They first appeared in the fossil record in the Early Cambrian (521 million years ago) and went extinct during the Permian mass extinction (250 million years ago). They were one of the most successful of the early animals on our planet with over 25k described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left a excellent fossil record.