Rheoheros
Rheoheros is a genus of cichlids. These freshwater fish are found in the Atlantic slope of Mexico and Guatemala in moderately to fast-flowing waters of the Grijalva-Usumacinta River system. Depending on species, they reach up to in length.
Species
There are currently 2 recognized species in this genus:Rheoheros coeruleus- ''Rheoheros lentiginosus''