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A geological period, defined by the appearance of Sarcopterygii or lobe-finned fish and sharks. This period also gave birth to the first amphibians, insects, and ammonites. The first amphibians, evolving from fish, left the water. The Devonian, was also the era of crustaceans. It is generally assumed that this group of animals, which exhibited a great diversity in shape and size, where the first to leave the water. Also Large variety of invertebrates and fish species evolved, and terrestrial plants started to develop leaves.

Situating the Devonian period on the geological timescale

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