The reason behind the megadiversity of fish in South America

From arowanas and vampire fish to streaked prochilods and catfish. And from dorados, tetras, soles, and red-tailed Brycon to piranhas, surubims, tambaquis, banded knifefish, and triangle cichlids. With one of the vastest river networks in the world, South America is home to a staggering variety of freshwater fish, with enough species to list several for each letter of the alphabet. With approximately 5,800 known species, accounting for slightly over one-third of the total known species worldwide, and an estimated 3,000 yet to be discovered, the region’s rivers, streams, lakes, and temporary lagoons are teeming with fish exhibiting an incredible array…

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