Rineloricaria latirostris is a species of freshwater ray-finned fish is a species of freshwater ray-finned fish belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Loricariinae, the mailed catfishes. This catfish is found in the upper Paraná River basin in Brazil. This species reaches a total length of and is believed to be a facultative air-breather.