You overall point is not wrong, but your logic in reaching it is flawed. It's CERTAIN that a boa from Suriname has ancestors elsewhere. It's also certain that a kingsnake from Pennsylvania and a boa from Suriname have common ancestors who were fish living in the ocean. This does not make them the same species.

What makes the Suri/Guyana distinction dubious has nothing to do with common ancestry. It's the fact that people breeding either one usually don't know for sure where their stock was collected.

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