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Trilobite Fossils

When trilobites first appear in the fossil record they are already highly diverse and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton an extensive fossil record was left behind, with some 17,000 known species spanning Paleozoic time.

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FS-5b Trilobite specimen, known as a "mud trilobite". Flexicalymene, Devonian, 350+ million years old. Found in Morocco. Approximately 2.5 - 3.5 inches long.