Middle Devonian

From EvoWiki

The middle Devonian is a geologic epoch that that occurred in the Devonian period around 397.5 million years ago to 385.3 million years ago. The middle Devonian is divided into two stages: Eifelian and Givetian.

Life in the Middle Devonian

In the middle Devonian the armored jawless fish known as ostracoderms were declining in diversity and instead the jawed fish were thriving and increasing in diversity in both the oceans and freshwater. The shallow, warm, oxygen-depleted waters of Devonian inland lakes, surrounded by primitive plants, provided the environment necessary for certain early fish to develop essential characteristics such as well developed lungs, ability to crawl out of the water and onto the land for short periods of time, possibly in search of food which would be developed later by the tetrapods, which are descendants of these early fish, in the Late Devonian.

The earliest known trees, from the genus Wattieza, appeared in the middle Devonian around 380 Ma.[1]

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