Pareiorhaphis garapia[1] is a species of catfish in the family Loricariidae.

It is native to South America, where it occurs in the Tramandaí River basin in the state of Rio Grande do Sul in Brazil.

The species reaches 6 cm (2.4 in) in standard length and is believed to be a facultative air-breather.

[2] The stream in which Pareiorhaphis garapia occurs is characterized by clear water, dense riparian vegetation, a depth of up to 50 cm (20 in), a width of 3 to 4 m (9.8 to 13.1 ft), a strong current, a basaltic substrate composed primarily of rocks, and a forest canopy that blocks direct sunlight.

The water in which it occurs has been found to have a temperature of 16.5 °C (61.7 °F), a pH of 7.6, a conductivity of 35.3 μS/cm, and an oxygen concentration of 10.4 mg/L.