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Amazon - Brazil

From an evolutionary standpoint, Amazonian fish species come from an ancient line of groups that were already established nearly 60 million years ago (they have changed little since that time).  The most commonly accepted theory regarding the existence of most Amazon species is that their precursors evolved during a period when what is now South America, Africa, southern Asia and Australia were a single continent called Gondwanaland. 

Upon the separation of these continents, these mutual ancestors then evolved independently.  Today, although the remnant of this relationship between the Amazonian, African and Australian fish remains evident, their modern descendents have speciated into thousands of endemic varieties.