5 species (see text) Epactionotus is a genus of armored catfishes native to South America.

Epactionotus is sister to a clade including Eurycheilichthys, Pseudotocinclus, Microlepidogaster, Schizolecis, Otothyris, and Pseudotothyris.

The head have longitudinal light-colored stripe markings which may extend onto the body over a base green color.

These fish are found in shallow, small rivers or creeks with bottom composed of rocks, loose stones, and gravel (and may also include sand and mud) and clear water with slow to moderate current.

[1] The fishes are usually found on leaves and stalks of marginal vegetation, frequently adhering by means of their pelvic fins.