aug 5, 419000000 BC - Devonian Period

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By the mid-Devonian, the fossil record shows evidence that there were two new groups of fish that had true bones, teeth, swim bladders and gills. By the end of the Devonian, progymnosperms such as Archaeopteris were the first successful trees. Millipedes, centipedes and arachnids continued to diversify during the Devonian Period. Millipedes, centipedes and arachnids continued to diversify during the Devonian Period.

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