Oxyropsis is a monophyletic genus of catfishes (order Siluriformes) of the family Loricariidae. It includes three species, O. acutirostris, O. carinata, and O. wrightiana.
and O. wrightiana
are distributed in the middle and upper Amazon
River basin, while O. acutirostris
is distributed in the Negro
basins of South America
species are distinguished by the presence of a single row of enlarged odontodes
along the trunk midline lying adjacent, and immediately dorsal
to, the lateral line
species have a depressed head and have relatively large eyes placed ventrolaterally. Oxyropsis
is most similar to Hypoptopoma
in external appearance, which shares the head shape and eye placement. Oxyropsis
are elongate and have a narrow caudal peduncle
, which distinguishes it from all other Hypoptopomatinae genera except Niobichthys
The species of Oxyropsis are distinguished based on their armor plate formation, numbers of plates and teeth, relative depth of the caudal peduncle, development of serrae on the pectoral fin spine. Males have a genital papilla.