So, I've been looking for a solution to the question: Why did vertebrates fail to flourish on Myrmecos?
I think I have the answer: No Armored Fishes.
If there were no armored fish then the Eurypterids would have continued to be apex predators longer. Some might have filled the hunting niche of early tetrapods. Arthropods were already on land, but you get a second wave.
The land gets built up with arthropods and fish are trapped in the seas!
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@futurebird Perhaps something about the water chemistry makes calcium less available.
