Sternarchorhynchus

Sternarchorhynchus is a genus of ghost knifefishes with a long, decurved snout that are found in river basins in tropical South America.

==Distribution, habitat and conservation== Of the 32 recognized species, more than are restricted to the Amazon basin (including the Tocantins system) in Bolivia, Brazil, Colombia, Ecuador and Peru, 7 species are found in river basins flowing into the Gulf of Paria in Colombia and Venezuela (mostly Orinoco system, but S. mendesi in Guanipa and San Juan), S. freemani is from the Essequibo basin in Guyana, S. galibi is from the Maroni basin in French Guiana and Suriname, and S. britskii is from the upper Paraná basin in Brazil. There are records of Sternarchorhynchus from the Oyapock on the French Guiana–Brazil border, but their validity and taxonomic position is unclear. Most species have relatively small ranges, but a few are more widespread. S. mormyrus of the Amazon and Orinoco basins is the only that occurs in more than one major river system.