Astyanax aurocaudatus

Carlastyanax is a monospecific genus of freshwater ray-finned fish belonging to the family Stevardiidae. The only species in this genus is Carlastyanax aurocaudatus, a characin, also known as the gold-tailed tetra, which is endemic to the upper part of the Rio Cauca drainage basin in Colombia. The coloration of this species - a greenish-yellow back, a white belly, and fins that range from red to yellow - is notable for differing with the sex of the individual fish, a trait known as sexual dichromatism.

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Carlastyanax aurocaudatus es una especie de peces de la familia Characidae en el orden de los Characiformes. Morfología Los machos pueden llegar alcanzar los 6 cm de longitud total. ​ Hábitat Vive en zonas de clima tropical entre 22 °C - 25 °C de temperatura.