A well-preserved trilobite specimen from Morocco

A well-preserved trilobite specimen from Morocco that lived during the Devonian Period roughly 400 million years ago.

This trilobite is a member of the Order Phacopida, Family Acastidae from the Devonian deposits of Foum Ziguid, Morocco known commercially as the Trident Comura.

Trilobites were the first creatures with eyes. There were also many trilobites that didn't have eyes and were blind.The two types of trilobite eyes were: the schizochroal or compound eye,which had a number of closely packed lens units that were entirely covered by a single large cornea,and the holochroal,or aggregate eye, which consisted of separately encased lenses that were each covered by it's own cornea.