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a radiation of smaller
5 inches wide and 40 inches long
probably for defense
allowing it to stab its victims with its incisors
of the Egg Mountain brooding colony of a much larger relative
Dikelocephalus minnesotensis, trilobite (Replica) Dimorphodon a radiation of smallerFrom the Upper Cambrian of the Dells Area, Wisconsin. Trilobites are very well known, and possibly the second most famous fossil group after the dinosaurs. There are over 17,000 species of trilobites. The name "trilobite" (meaning "three lobed") is not based on the body sections cephalon, thorax and pygidium, but rather on the three longitudinal lobes: a central axial lobe, and two symmetrical pleural lobes that flank the axis. Trilobites are extinct