" Retroculus acherontos is described from the Rio Tocantins basin, Brazil. It is distinguished from all congeners by the presence of a nuchal hump in large specimens, an irregular black blotch located on the middle of the anterior soft dorsal-fin rays, fewer pectoral-fin rays (15–16), a deeper body, a convex ventral profile, a more transversely convex ventral surface of the body, and by chest scales similar in size to the scales on the side. An expanded diagnosis for the genus Retroculus is provided "
Classification: Taxonomy and phylogeny, South America.
Reference in bibliography for species (1)
Landim, María Isabel & C.R. Moreira & C.A. Figueiredo. 2015. "Retroculus acherontos, a new species of cichlid fish (Teleostei) from the Rio Tocantins basin". Zootaxa. v. 3973(n. 2), pp. 369-380 (crc06779) (abstract)