Check the listing for details. Trilobite Extinct Arthropod Fossil in Display Case with Toy. Condition: Used. Listed at 19.99 USD. This is an authentic Moroccan Phacops Trilobite fossil in a great display case with a toy! This little Trilobite was from Morocco. Trilobites have been extinct for over 250 million years. This Trilobite is nearly 1/2" long. The fossil comes in a unique display case and includes a laminated information card. Also included is a cool Trilobite toy to display next to the fossil. The material feels to be plastic. The toy is about 2" x 1". This toy is not suitable for children under five years old. All fossils sold are authentic and one-of-a-kind. No replicas. TrilobiteTrilobite, any member of a group of extinct fossil arthropods easily recognized by their distinctive three-lobed, three-segmented form. Trilobites, exclusively marine animals, first appeared at the beginning of the Cambrian Period, about 542 million years ago, when they dominated the seas. Although they became less abundant in succeeding geologic periods, a few forms persisted into the Permian Period, which ended about 251 million years ago.Trilobites had three body lobes, two of which lay on each side of a longitudinal axial lobe. 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. For the animal to grow, the exoskeleton had to be shed, and shed trilobite exoskeletons, or portions of them, are fossils that are relatively common.Each trilobite body segment bore a pair of jointed appendages. The forwardmost appendages were modified into sense and feeding organs. Most trilobites had a pair of compound eyes; some of them, however, were eyeless. TB016