Crotalocephalus gibbus Trilobite

Crotalocephalina (Crotalocephalus) gibbusTrilobite Order Phacopida, Family Cheiruridae Late Silurian to Early Devonian  Size: approx 1.75" nose to tail Matrix size approx 3" x 2.25"  Fossil Site: Lamrakeb, Alnif , Morocco   Trilobites are a group of extinct marine artiopodan arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The trilobite body was segmented and divided into three regions from head to tail: the cephalon, or head region, separated from the thorax, which was followed in turn by the pygidium, or tail region. Trilobites, like other arthropods, had an external skeleton, called exoskeleton, composed of chitinous material.