Loricariidae

Arnold's sucker catfish

Otocinclus arnoldi

Four Point Eight Centimeters Catfish of the Brazilian Coast

• Tropical
• Lower river
• Southern Hemisphere
• Regional distribution
• Freshwater fish
• South America
• Elongated
• Small
• Tropical fish

Otocinclus arnoldi is a species of freshwater ray-finned fish belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Hypoptopomatinae, the cascudinhos. This catfish is found in South America, where it occurs in the lower río Paraná drainage, in the lower and middle rio Uruguai and in the río de La Plata in Argentina, Bolivia, Brazil, Paraguay and Uruguay. This species reaches a maximum standard length of 4.8 cm (1.9 in).