Nematogenys inermis is a species of mountain catfish, the only extant species in the family Nematogenyiidae.

[2] This species grows to a length of 40.7 cm (16.0 in) NG.

[3] The body is naked (without scales) and elongated.

[2] The Nematogenyidae and Trichomycteridae are sister groups that together form a clade sister to the families Callichthyidae, Scoloplacidae, Astroblepidae, and Loricariidae.

[4] One extinct species, Nematogenys cuivi, has been described in this genus.