Pseudotocinclus parahybae

Pseudotocinclus parahybae has the tip of its snout covered in small platelets, unlike P. tietensis but like P. juquiae but this species does not have the obvious and distinct ring on the orbit that P juquiae shows. This species reaches a standard length of 66.4 mm (2.61 in).

Pseudotocinclus parahybae is endemic to Brazil being found in the tributary of the Ribeirão Grande, Fazenda São Sebastião do Ribeirão Grande, Paraíba do Sul river basin, in the minicipality of Pindamonhangaba in the state of São Paulo. It has also been recorded from the Buenos stream, in the Buenos basin in the minicipality of Guaratinguetá, also in the state of São Paulo. It is thought that this catfish mey have a wider distribution in the streams draing from the mosaic of conserved natural habitat in the hills between the states of São Paulo and Rio de Janeiro, however, there have been very few ichthyological collections in this area. The types were collected from a stream between 0.5 to 1.5 m (1 ft 8 in to 4 ft 11 in) in depth and which was 5 m (16 ft) in width, at 800 m (2,600 ft) above sea level, on the slopes of the Mantiqueira Mountains, with very clear, well-oxygenated water and a flowing fast over a rocky bed.

Pseudotocinclus parahybae is classified in the genus Pseudotocinclus, this name prefixes pseudo-, meaning “false”, onto Otocinclus, as these fishes appear to bear some resemblance to that genus but that resemblance is misleading. The specific name, parahybae, means "of Paraiba", the Paraiba do Sul river basin contains te type locality, derived from the Tupí word which means "useless river", applied to an unnavigable stetch of the river.