The Hypoptopomatinae are a subfamily of catfishes of the family Loricariidae, composed of 32 genera and approximately 265 species. This subfamily represents about one-tenth of all loricariid species.

Hisonotus is a genus of freshwater ray-finned fishes belonging to the family Loricariidae, the mailed catfishes, and the subfamily Hypoptopomatinae, the cascudinhos. The catfishes in this genus are fo