This Specimen has been sold.
1.6" Crotalocephalus (“Cyrtometopus”) - Scarce Species
This is a fairly scarce species of Crotalocephalus from Morocco. It has a pair of distinctive projections coming out of the front of it's cephalon. In the past it's been labeled as Cyrtometopus but it's most likely a species of the Crotalocephalus genus. It is arched but would be about 1.6" long if outstretched. The genal spines have been prepared free of the surrounding limestone.
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.