Copionodon orthiocarinatus is a species of freshwater ray-finned fish belonging to the family Trichomycteridae and the subfamily Copionodontinae, the Chapada pencil catfishes. It is found in the Mucujê River, a tributary of Paraguaçu River in Bahia, Brazil.de Pínna, M.C.C. and W. Wosiacki, 2003. Trichomycteridae (pencil or parasitic catfishes). p. 270-290. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. This species reaches a length of .
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