Abstract
The fauna of freshwater neotropical fish is the richest and most diversified on the planet, containing 71 families, several hundred genuses and, approximately, 6,000 species, 4,475 of which are effectively described. It is an ictiofauna dominated, both in terms of taxonomic diversity and in biomass, by fish of the Ostariophysi superorder, Otophysi series, which cover approximately 73 per …