• Trilobite - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Trilobite The earliest trilobites known from the fossil record are redlichiids and ptychopariid bigotinids dated to some 8] [9] Contenders for the earliest trilobites include ...
  • Introduction to Trilobites

    www.trilobites.info/trilobite.htm Trilobites are remarkable, hard-shelled, segmented creatures that existed over 520 million years ago in the Earth's ancient seas. They went extinct before ...
  • American Museum of Natural History Trilobites Website

    www.amnh.org/our-research/paleontology/faq/trilobite-website Trilobite Website. Introduction to Trilobites; Gallery of Trilobites. Cambrian Period Trilobites . Cambrian Trilobites of the United States (alphabetized)
    • TRILOBITES FOR SALE - Paleo Direct

      www.paleodirect.com/trilobites-for-sale Trilobite Fossils. EARLY CAMBRIAN PERIOD to LATE PERMIAN PERIOD: 570 million - 230 million years ago. Trilobites are hard-shelled, segmented creatures that lived ...
    • Trilobite - New World Encyclopedia

      www.newworldencyclopedia.org/entry/Trilobite 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 ...
    • Trilobites

      www.trilobites.us/index.htm The trilobites (Phylum Arthropoda, Class Trilobita) first appear in the fossil record in the Lower Cambrian some 540 ...
    • Trilobites - U-Dig Fossils

      www.u-digfossils.com/trilobites.html What is a trilobite? A trilobite is form of invertebrate marine life that lived more than 550 million years ago, but are now extinct. These hard-shelled prehistoric ...
    • Trilobita Trilobites - The Virtual Fossil Museum

      www.fossilmuseum.net/Tree_of_Life/PhylumArthropoda/ClassTrilobita.htm Trilobites Introduction. Trilobites comprise a complex and huge clade of arthropods with estimates of number of species ranging ...
    • A Guide to the Orders of Trilobites

      trilobites.info All aspects of the biology and classification of trilobites, including morphology, ecology, localities, reproduction, development, behavior, biostratigraphy, etc.
    • trilobite | fossil subphylum | Britannica.com

      www.britannica.com/animal/trilobite Trilobite, any member of a group of extinct fossil arthropods easily recognized by their distinctive three-lobed, three-segmented form. Trilobites, exclusively marine ...