Typový druh
Horiomyzon retropinnatus Stewart, 1986.
Původní popis
Stewart, D. J. 1986. A new pimelodid catfish from the deep-river channel of the Río Napo, eastern Ecuador (Pisces: Pimelodidae). Proceedings of the Academy of Natural Sciences of Philadelphia v. 138: 46-52.
Použitá literatura
Fricke, R., Eschmeyer, W. N. & Van der Laan, R. (eds). 2026. Eschmeyer's catalog of fishes: Genera, species, references. World Wide Web.