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  • Trilobite | fossil arthropod | Britannica

    Because trilobites appear fully developed in the Cambrian Period, it appears likely that the ancestral trilobites originated during the Ediacaran Period (630 million to 542 million years ago) of […]

  • Trilobite - New World Encyclopedia

    Trilobites are hard-shelled, segmented members of the phylum Arthropoda and the class Trilobita that appear in the fossil record for almost 300 million years—from about 540 to 251 million years […]

  • Introduction to Trilobites

    Trilobites are remarkable, hard-shelled, segmented creatures that existed over 520 million years ago in the Earth's ancient seas. They went extinct before dinosaurs even came into existence, and are […]

  • A Guide to the Orders of Trilobites

    View galleries of trilobite images from the web, examine fact sheets, pictorial guides, and an identification key for each order, refer to a family listing, a genus listing, or consult a trilobite […]

  • Trilobite - Wikipedia

    Trilobites (/ ˈ t r aɪ l ə ˌ b aɪ t, ˈ t r ɪ-,-l oʊ-/; meaning "three lobes") are a group of extinct marine artiopodan arthropods that form the class […]

  • What is a Trilobite? -

    Trilobites continued to develop and radiate during the lower Paleozoic until their decline into the Devonian. Proetida is the only trilobite order that survived into the Permian. The Permian mass […]

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