It is endemic to southern Brazil and is only known from its type locality near Rio dos Cedros, Santa Catarina.

The sides of body and posterior surface of thighs bear distinctive small yellow dots.

[2] The male advertisement call consists of sporadic, single notes.

[2] Cycloramphus cedrensis is known from fast-flowing rocky streams in rainforest at elevations of 300–350 m (980–1,150 ft) above sea level.

It is threatened by habitat loss caused by logging and development of hydroelectricity infrastructure.