| Trilobites, photos, thomas wiewandt, tom wiewandt, images, photographs, photography, gallery, arts |
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| Trilobites,
extinct relatives of insects, crabs, and spiders, flourished on the sea floor early in the Paleozoic era. These Elrathria kingi fossils were unearthed in Utah, USA. Specimen courtesy of Thomas Johnson, House of Phacops, Ohio. |
  prehistoric |
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