I think there are so few native tropical reptiles is because of floridas inconsistant geological history 8000 years ago you could walk past key west on dry land and this would have been an ideal situation for epicraties to "jump" across. But with about a 10 sealevel rise most of the land below lake O would be underwater (I am sure this has happened in the last 30,000 years or so) this would push all the animals up north and the cold could have killed them off. That is why all the animals in florida came from the north and few if any jumped up from the south.
Rob

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