Trilobites are an ancient life form which became extinct during the Permian mass-extinction. Every aspect of this arthropod is covered, including morphology (the body plan), eyes, size, internal anatomy, feeding, reproduction, and classification. There is a glossary of trilobite-related terms, a self-quiz, and photo gallery of the 8 orders. A geologic time chart reviews the history of this creature, and a paleogeography section covers the environment in which it lived. Additional links, fact sheets, and references are provided.
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