.75" Destombesina Trilobite With Small Axial Spines
This is a small, .75" long Acastid trilobite which I believe probably is of the genus Destombesina. It has a row of small axial spines which don't appear on Destombesina tafilaltensis. This species is nicely prepared with tiny eye facets visible in its eyes.
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.