Diplomystidae

Otuno

Olivaichthys viedmensis

Diplomystid Fish in the Amazon Basin

• Tropical
• Southern Hemisphere
• Regional distribution
• Freshwater fish
• South America
• Medium
• Tropical fish

Diplomystes viedmensis, the Otuno, is a species of freshwater ray-finned fish belonging to the family Diplomystidae, the velvet catfishes. This fish is endemic to Argentina where it is found in the Rio Negro and tributaries. It reaches a maximum standard length of 32.4 cm (12.8 in).