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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.
Silurian Period. Note the expansion of life following the mass extinction at the end of the Ordovician. During the Silurian Period the first land plants appeared. Marine organisms once again expanded in diversity following the extinction of so many families in the late Ordovician. The Silurian was probably relatively warm even though pCO2 may have been lower. This is thought to be because there was no large land mass over the south polar region during the Silurian period.