1.9" Metascutellum Trilobite - Very Pustulose
This is an unusual Styginid trilobite from the Lhandar Formation of Morocco, Metascutellum pustulatum. The entire shell of this species is covered in small pustulose, hence the name. This specimen is slightly arched but would be 1.9" long if outstretched.
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.