>>Just a little, tiny bit of evidence that perhaps there IS geneflow from south to north in Mexico


I don't think there is any question, but really what it is, is north and south migrations and die offs. We have populations which thrive, expand, connect with others, separate, evolve, reconnect, die off, expand, etc ad naseum. Obviously not limited to north / south, but it's easy to link these species and follow the migration patterns. Throw in geography and it easily explains what is going with thayeri, and even the evolution of blairi / alterna (which IMO are not safe from "conservation genetics".

I think the ruthie theory (or common ancestor) is likely.
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Conservation through captive propagation
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