Creagrutus atratus is a species of freshwater ray-finned fish, a characin, belonging to the family Stevardiidae.Vari, R.P. and A.S. Harold, 2001. Phylogenetic study of the Neotropical fish genera Creagrutus Günther and Piabina Reinhardt (Teleostei: Ostariophysi: Characiformes), with a revision of the Cis-Andean species. Smith. Cont. Zool. 613:1-239.
It is found in the Orinoco basin in the western part.
This species reaches a length of .
The fish's name means "dressed in black" in Latin, probably referring to the dark coloration of type series and many of the other available specimens.
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