This Specimen has been sold.
Bargain, 2" Hollardops Trilobite - Visible Eye Facets
This is a bargain Hollardops mesocristata trilobite quarried near Foum Zguid, Morocco. It shows quite a bit of surface detail including preserved eye facets. Surface detail is quite good, it was just never cleaned with air abrasives so there is still rock in between some segments.
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.