Systematic Classification of Life ep9 - Gnathostomata

This episode begins with the emergence of vertebrates at the end of the Cambrian, and covers the entire Ordovician period to show the evolution of jaws by the beginning of the SIlurian.  
Here is a link to the entire series playlist.
Systematic Classification of Life
Here are some links to follow on Palaeos.
http://palaeos.com/vertebrates/verteb...
http://palaeos.com/vertebrates/pteras...
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• #ordovician
• #silurian
• #agnatha
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• #jawless
• #vertebrates
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• #conodonts
• #myxini
• #pterospidomorphs
• #pteraspida
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• #thelodonts
• #thelodontimorphi
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• #galeaspida
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• #osteotraci