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So posting the "WI: No K-T extinction" thread got me thinking about other possible alternate evolutions.

What if (and how could have) cephalopods, not only gastropods, made it into land? What if (and how could have) giant sea arthropods survived? Could ichthyosaurs have evolved even further into fish? What if vertebrates never evolved?

This can be sort of a megathread (even though it will probably die within the day :p). Discuss anything about alternate evolutions.
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