Pseudotocinclus parahybae is a species of armored catfish endemic to Brazil, where it is known only from the type locality, a tributary of the ribeirão Grande, rio Paraíba do Sul basin.

It is a medium-size creek, 0.5–1.5 metres (1.6–4.9 ft) deep and 5.0 m (16.4 ft) wide at approximately 800 m (2600 ft) above sea level, on the slope of Serra da Mantiqueira, with very clear, well oxygenated, and fast flowing water, running mainly on stone beds.

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