Pseudostegophilus is a genus of pencil catfishes native to rivers in tropical South America. The members of this genus are obligate parasites that feed on scales and mucus of other fish. Species There are currently two recognized species in this genus: Pseudostegophilus haemomyzon (Myers, 1942) Pseudostegophilus nemurus (Günther, 1869) P. haemomyzon originates from the Orinoco River basin in Venezuela while P. nemurus is found in the Amazon basin in Brazil and Peru. P. haemomyzon grows to about 5.7 centimetres (2.2 in) SL. P. nemurus grows to about TL. P. nemurus is said to become attached to the gills, anal region, and fins of dead, dying, or disabled fishes. References Trichomycteridae Fish of South America Fish of the Amazon basin Fish of Brazil Fish of Peru Fish of Venezuela Freshwater fish genera Catfish genera Taxa named by Carl H. Eigenmann Taxa named by Rosa Smith Eigenmann