Distribution
The tribe Rhinelepini has an interesting biogeography and reveal information about the aquatic systems of South America. There is a split between the species that inhabit Amazon and those that inhabit the eastern river systems. Pseudorinelepis, the most basal group, is found only in the Amazon basin. Pogonopoma, is found in the Mucuri, Paraíba do Sul, and Uruguay River systems in southeastern Brazil. Rhinelepis is found in São Francisco River and Paraná River. It is also thought to have spread through to the Paraíba by a sharing of its headwaters with the Paraná in the past, which eventually got separated into two basins.
It is interesting to note that the oldest group, Pseudorinelepis, inhabits the Amazon area, while the distribution of the newer, more derived groups occurs in Southern Brazil, which is comparatively older.
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