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Re: New Papers of the Ya-Ya Sisterhood
Agreed. I didn't have any biogeographical hypothesis in mind when I
brought up the fact that dromaeosaurids had been reported from all modern
continents. But now that you mention it, it either means that the
appearance of dromaeosaurids pre-dates the break-up of Pangaea; or that
early dromaeosaurids could fly, and didn't need land connections to get
from one landmass to another. But even if the latter was true (I think
the jury is still out), you have to wonder if their flight abilities were
adequate for long flights.
Well, the breakup of Pangaea only started for biogeographical purposes
around the Early-Late Cretaceous boundary when Africa broke off of South
America and apparently lost the spinosaur connection to Europe (...and
Thailand). The Kimmeridgian "dromaeosaurine" teeth from Guimarota are much
older than that.