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The dominant marine/aquatic animals during the Devonian included the placoderm fishes, and important marine invertebrates included trilobites, nautiloids and the first ammonit â¦ es. The first land animals were arthropods, including scorpions, spider-like and mite-like arachnids, primitive insects, and myriapods. The Devonian Period, from the Paleozoic Era, was also known as the Age of the Fishes. 2  At thâ¦. 3  Domain Archaea: a New Discovery Organisms from the domain archaea are microscopic organisms that were just discovered in the 1970s.
Fish, arthropods, amphibians, reptiles, and synapsids all evolved during the Paleozoic. Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, it was dominated by various forms of organisms. Great forests of primitive plants covered the continents, many of which formed the coal beds of Europe and eastern North America.