Generaly speaking is was south to north but mainly up through the antillies and across the greater antillies and up the bahamas. But the only way for iguanas to arrive on GC would be from rafting because GC is a spec of a mountain that has never been close to another land mass and continental drift would be way to far in the past. It has also never had people on it befor its european discovery. If iguanas were on it from SA they would be far more diverged than they are now. I believe all the cychluras in the bahamas evolved from a cuban island hop also even farther in the past with little additional new jean influx possibly due to the gulf stream blocking any rafts to the bahamas from cuba in more geologicly recent times. I agree that specilization can happen fast ( I look at dogs for that) but 500 years may be a little quick for species divergence. I also have looked at the ocean levals in the past for many of my opinions and many of the islands are surounded by trenches that the only way for jumping is to raft and I would think the most likely reason for being on a raft is a storm.

Rob

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