Původní popis
Taphorn, D. C., C. G. Montana & P. Buckup. 2006. Characidium longum (Characiformes: Crenuchidae), a new fish from Venezuela. Zootaxa No. 12147: 1-12.
Použitá literatura
Fricke, R., Eschmeyer, W. N. & Van der Laan, R. (eds). 2024. Eschmeyer's catalog of fishes: Genera, species, references. World Wide Web.