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trilobite
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trilobite trilobite fossil trilobite trilobite Close-up of a trilobite fossil embedded in brown rock, showing the segmented body and ridged exoskeleton. trilobite trilobite Line graph showing the number of marine animal families from the Precambrian era to the present, with illustrations of key groups such as trilobites, ammonoids, marine reptiles, and diatoms. The graph highlights major extinction events and a rise to 1,900 living families today.
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Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
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trilobite: References & Edit History

Article Contributors

Primary Contributors

  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Add new Web site: The Royal Society Publishing - Proceedings B - Were all trilobites fully marine? Trilobite expansion into brackish water during the early Palaeozoic. Oct 28, 2026
Add new Web site: Frontiers - Frontiers in Ecology and Evolution - Permian trilobites and the applicability of the “living fossil” concept to extinct clades. Mar 07, 2026
Add new Web site: University of Liverpool Repository - Blasts from the Past 8: The Determination of the Mode of Life of Trilobites Background (PDF). Jul 26, 2025
Add new Web site: Museum of the Earth - Trilobites. Jun 15, 2025
Add new Web site: Nature - Communications Biology - Reassessing a cryptic history of early trilobite evolution. Sep 20, 2024
Add new Web site: Northern Arizona University - Trilobites. Jul 13, 2024
Add new Web site: PNAS - Trilobite evolutionary rates constrain the duration of the Cambrian explosion. May 31, 2024
Add new Web site: Jiwaji University - Trilobite. Apr 05, 2024
Updated geologic time boundaries. Apr 03, 2024
Add new Web site: University of Oxford - Museum of Natural History - What were trilobites? Feb 23, 2024
Add new Web site: Natural History Museum - How trilobites conquered prehistoric oceans. Jan 08, 2024
Add new Web site: Live Science - We finally know how trilobites mated, thanks to new fossils. Nov 01, 2023
Add new Web site: Australian Museum - What are trilobites? Aug 22, 2023
Add new Web site: The Canadian Encyclopedia - Trilobite. Jun 16, 2023
Add new Web site: American Museum of Natural History - Trilobite Website. Mar 24, 2023
Add new Web site: University of Kansas - Kansas Geological Survey - Trilobite. Feb 11, 2023
Add new Web site: British Geological Survey - Trilobite. Dec 30, 2022
Add new Web site: British Geological Survey - Trilobites. Sep 29, 2022
Add new Web site: National Center for Biotechnology Information - PubMed Central - Reassessing A Cryptic History Of Early Trilobite Evolution. Sep 26, 2022
Add new Web site: Animal Planet - Trilobita. Sep 13, 2011
Added image of Cambrian trilobite fossils. Jan 31, 2011
Added two images of trilobite fossils from Morocco. Oct 01, 2010
Article revised and updated. Aug 11, 2008
Added new Web site: Animal Planet - Trilobite. Jun 02, 2008
Added new Web site: Paleo Direct - Trilobites. Apr 09, 2008
Added new Web site: Enchanted Learning - Trilobite. Mar 05, 2008
Added new Web site: Per Hansson's trilobite gallery. Jan 16, 2007
Added new Web site: Australian Museum Online - Palaeontology - Trilobites. Jan 16, 2007
Added new Web site: Utah Geological Survey - Trilobites. Jan 16, 2007
Added new Web site: University of California Museum of Paleontology - Introduction to the Trilobita. Jan 16, 2007
Added new Web site: University of California, Berkeley: Museum of Paleontology - Introduction to the Trilobita. Jun 26, 2006
Added new Web site: A Guide to the Orders of Trilobites. May 18, 2006
Article added to new online database. Jul 20, 1998
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