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a thorax of up to 30 segments
Reaching a length of 15 feet
which would be the only animal phylum to go completely extinct if it did really exist
people often refer to the coelacanth as a "living fossil
Psychopyge elegans, trilobite (Replica) Stegosaurus a thorax of up toIn addition to its many spines this very unusual trilobite also has a large spine or appendage on the front of the head. This specimen is from the Hamar Laghdad Formation, Alnif region, Morocco. Trilobites are very well known, and possibly the second most famous fossil group after the dinosaurs with some 15,000 known species. Trilobites are extinct arthropods that form the class Trilobita. They appeared at the start of the Cambrian period and
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