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I got the idea, and I don't remember where, that this seeding of planets done by an alien race was very low on the evolution level - lower than humanoid form. Maybe even microbe level. But 5,000,000 years would not give enough time for evolution to the humanoid level. So I am confused about WHAT was seeded on these planets. The gist of it from the episode was that all these species from different worlds were somehow related. I would still say Vulcans are native to Vulcan, though, for purposes of fan fiction. Because if this seeding makes them non-native, so are we non-native to earth and so are the Klingons and everyone else who was 'seeded', non-native to their home worlds, right?

evcake wrote:Third eyelid?

I believe they're discussing what is more correctly known as a nictitating membrane. It's found in quite a few Terran species - even Humans have a vestigial form. Those of you who have cats may have seen it, as the cat dozes off. Or has an eye infection. So... just being in the chordata phylum (equiv) should be enough, no special evolution needed.

It isn't presented in this way, on the show. (If I don't mistake)