Author: Piálek, Dragová, Casciotta, Almirón & Říčan, 2015
Comments: Relatively common only in the main channel of the Iguazú River, where they can be observed in schools on the flat-rock substrate from the walkways over the river grazing on periphyton. Always encountered in direct association with flat slab-like exposed rocky bottoms with epiphyte growths, never above gravel or soft sediment-covered bottoms.  Grazes on periphyton  (Ref. 104794).