W. J. E. M. Costa, 2006
| Melanorivulus is a genus of South American freshwater fish in the family Rivulidae.
Most species are found in the Río de la Plata, eastern Amazon (west to Tapajós basin), Tocantins–Araguaia and São Francisco basins in Brazil. A few members of this genus range west into Bolivia, and into Paraguay and Argentina.
There are 60 species in the genus and more being added regularly as new areas of the Amazon and Sao Francisco River basins are explored.
Melanospilus nova species