The theory of universal common ancestry (UCA) was formally tested in 2010 using a model selection method. This test showed, overwhelmingly that UCA is likely to be true. In light of this and of theories regarding the evolution of modern Eukaryotes via endosymbiosis, are there any good bio-geographic theories about how these localised, newly emerged eukaryotic cells spread around the earth?
Interesting question! I would imagine they would spread in much the same way that microbial eukaryotes (Protists) do today? There has been some work done on the biogeography of protists....
It is likely that early endosymbiosis occurred several or more times by convergent evolution. Tracking down the particular locus of any endosymbiosis event will be tough, but you might be able to narrow it down to a specific region of Rodinia, and document its spread from there. The early protist fossil record, with all its imperfections, will be critical for any such effort.
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