Retroculus acherontos, a new species of cichlid fish (Teleostei) from the Rio Tocantins basin
Landim, M.Isabel.; Moreira, C.R.; Figueiredo, C.A.
Zootaxa 3973(2): 369-380
2015
ISSN/ISBN: 1175-5326 PMID: 26249865 Document Number: 685619
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.