Nannoptopoma sternoptychum 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 the upper Amazon basin in Ecuador and Peru, and the Amazon basin, including the Upper Madeira River in Bolivia, Brazil and Peru, as well as in the Orinoco in Colombia. This species reaches a maximum standard length of .
References
Schaefer, S.A., 1996. Nannoptopoma, a new genus of loricariid catfishes (Siluriformes: Loricariidae) from the Amazon and Orinoco river basins. Copeia 1996(4):913-926.