06/23/2026
Meet the Trilobite: One of Earth’s Earliest Success Stories!
Long before dinosaurs roamed the planet, trilobites ruled the ancient seas. These fascinating marine arthropods first appeared during the Cambrian Period over 520 million years ago and thrived for nearly 270 million years before disappearing in the great Permian extinction.
What makes trilobites so special?
• They had a hard exoskeleton divided into three distinct lobes—the feature that gave them their name.
• Many possessed complex compound eyes, making them among the earliest animals with advanced vision.
• Some could roll into a ball for protection, much like modern pill bugs.
• Scientists use trilobite fossils to date rocks and reconstruct ancient environments and continents.
With more than 17,000 known fossil species, trilobites provide an incredible window into life in Earth's ancient oceans.
Learn more from the British Geological Survey: British Geological Survey – Trilobites https://www.bgs.ac.uk/discovering-geology/fossils-and-geological-time/trilobites/