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 The first jawed vertebrates

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Kig 'Yar
Kig 'Yar


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Registration date : 2011-01-04

PostSubject: The first jawed vertebrates   Wed Mar 02, 2011 9:45 am

The first jawed vertebrates appeared in the Ordovician and became common in the Devonian, often known as the "Age of Fishes". The two groups of bony fishes, the actinopterygii and sarcopterygii, evolved and became common. The Devonian also saw the demise of virtually all jawless fishes, save for lampreys and hagfish, as well as the rise of the first labyrinthodonts, transitional between fish and amphibians. The Placodermi, a group of fishes that dominated much of the late Silurian and the majority of the Devonian period, also became extinct at the end of the Devonian.

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