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For 70 million years, the oceans, lakes and rivers of the world teemed with seven groups of fish:

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Placodermi

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Acanthodii

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Agnatha

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Chondrichthyes

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Sarcopterygii

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Actinopterygii

Now two of those groups have been extinct for hundreds of millions of years, but they were still a pretty big deal back then.

So by using modern fish as analogies, which niche(s) did which group of fish occupy during the Devonian Period?

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  • $\begingroup$ A fascinating question, I wish I had time to delve into it, but it seems I am not the only one unable to do it justice at the moment. $\endgroup$ – Astrolamb Aug 8 '18 at 21:20

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