Retroculus acherontos
Cichlidae · Landin, Mareira & Figueiredo, 2015
Retroculus acherontos is a cichlid known only from tributaries of the upper rio Tocantins basin in Goiás state, Brazil. It grows to at least 194 mm and differs from its congeners in developing a nuchal hump in both sexes above about 121 mm SL. Based on its morphology it is hypothesised to be less rheophilic than other Retroculus, and it has been collected in small to medium-sized tributaries with clear or sediment-filled water.
