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The Devonian is a geologic period and system of the Paleozoic Era spanning from  . It is named after Devon, England, where rocks from this period were first studied.

During the Devonian Period the pectoral and pelvic fins of lobe-finned fish evolved into legsSee Tiktaalik. as they started to walk on land as tetrapods around 397 Ma. Fossil tracks record 'oldest land-walkers' - BBC News Various terrestrial arthropods also became well-established.

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