Oxyropsis acutirostris

Oxyropsis actutirostris is distinguished from the other species in its genus by having a shorter series of 18-19 plates along the middle of the flank; a caudal peduncle with a depth of between 1.8% and 2.2% of its standard length; between 10 and 16 teeth on the premaxilla, 10 to 14 teeth on the mandible; the possession of well developed serra on the spine of the pectoral fin with the serrae being as much as around a third in height as the thickness of the spine. This species reaches a standard length of 4.4 cm (1.7 in).

Oxyropsis actutirostris is found in the Orinoco and Rio Negro basins in Brazil, Colombia and Venezuela. Very little is known about the ecology of this catfish.

Oxyropsis actutirostris is one of three valid species in the genus Oxyropsis, the name of which combines oxys, meaning "sharp" or "pointed", with opsis, which means "face" or "appearance". The describers of the genus, C. H. Eigenmann and R. S. Eignemann, did not explain this but it is thought to refer to the depressed head of the type species, O. wrightiana. The specific name, acutirostris, means "sharp snout", an allusion to the pointed snout of this species.