This Specimen has been sold.
1.5" Metacanthina (Asteropyge) Trilobite - Top Quality Example
This is a top quality specimen of Metacanthina issoumourensis often referred to as an "Asteropyge" or “Kayserops”. It's nicely prepared and displays very aesthetically on a sculpted piece of limestone. Great eye facet preservation on this specimen. It's 1.5" long with spectacular shell detail including clear eye facets. Notice how many of the pleural spines have been prepared free of the surrounding limestone. Less than 1% shell restoration, just two small touchups.
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 currently described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left an excellent fossil record.