Trilobite Extinct Arthropod Fossil in Display Case

Description: This is an authentic Trilobite fossil in a cool display case. Trilobites have been extinct for over 250 million years. This "rolled" Trilobite is about 1" x over 3/4" The fossil comes in a unique Trilobite display case and includes a laminated information card. All fossils sold are authentic. 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.Some trilobites were active predators, whereas others were scavengers, and still others probably ate plankton. Some trilobites grew to large size; Paradoxides harlani, which has been found near Boston in rocks of the Middle Cambrian Epoch (521 million to 501 million years ago), grew to be more than 18 inches in length and may have weighed as much as 10 pounds. Others were small. TB012

Price: 14.99 USD

Location: Davenport, Iowa

End Time: 2024-10-16T00:47:30.000Z

Shipping Cost: 4.99 USD