The Ordovician period saw a mass extinction event, followed by diversification and adaptive radiation of marine organisms. Jointed brachiopods replaced trilobites, while cephalopods and crinoids emerged. The period also saw the emergence of the first animals with sophisticated nervous systems and land plants. Ordovician organisms lived during the Ordovician period, which lasted between about 488.3 […]
The Ordovician period was dominated by marine life, with a quadrupling of marine fauna genera and an explosion of bioeroding organisms. Arthropods were the largest organisms, including the fearsome eurypterids. Trilobites were present but their diversity was reduced by an extinction event. The first vertebrates, including simple fish, evolved during this period. The Ordovician period […]
