This species is known from the eastern state of São Paulo, in Brazil. It has been recorded from 800-1,000m asl.
Habitat and Ecology
This species occurs on stones in primary and good quality secondary forest streams. Larvae are found on rocks that are covered with a film of running water, either on exposed rocks in or next to streams. It has not been recorded outside forested habitat.
It is a reasonably common species.
Air and water pollution from industry, and disturbance of the species' habitat by touristic activities are major threats.
Its range includes a few protected areas. More research into the species' Extent of Occurrence, and population status is needed, in particular to determine whether or not its range is much larger than currently known.
Ronald Heyer, Vanessa Verdade 2004. Cycloramphus dubius. In: IUCN 2014