Crotalocephalus gibbus Trilobite
Name: Crotalocephalina (Crotalocephalus) gibbus
Trilobite Order Phacopida, Family Cheiruridae
Geologic Time: Late Silurian to Early Devonian
Size: approx 2.5" nose to tail
Matrix size approx 2.5" x 2.5"
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.