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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.
Marine Life During the Devonian Period. The Devonian period marked both the apex and the extinction of the placoderms, prehistoric fish characterized by their tough armor plating (some placoderms, such as the enormous Dunkleosteus, attained weights of three or four tons).he Devonian Extinction. The end of the Devonian period ushered in the second great extinction of prehistoric life on earth, the first being the mass extinction event at the end of the Ordovician period.