Geophagus argyrostictus, a new species of cichlid fish from the Rio Xingu, Brazil
Geophagus argyrostictus sp. n. reaches 162 mm SL and is distinguished from other Geophagus species by having silvery reflecting spots on the side and a dark vertical stripe below the eye. It is the first substrate brooding species to be recorded in the genus. Collecting localities are in the upper (Cachoeira von Martius) and lower (Belo Monte, Altamira, Cachoeira do Espelho, Rio Curuá) Rio Xingu drainage. Samples from the two geographical areas differ slightly in colour, morphometry and meristics.