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The biogeographic importance of that land is out of question.
Species from South America used the narrow corridor towards the north, while North American species went exactly in the contrary direction. Furthermore, many islands became mountains in that
time, and speciation produced many endemics. Panama (of 75.000km2), with Costa Rica (50.000 km2) is the most diverse country in the world in herp species by surface. Panama counts nowadays with
more than 220 species of amphibians and 250 of reptiles).