CR

Granular Button Frog

Cycloramphus granulosus

Unknown

Overview

Cycloramphus granulosus is a species of frog in the family Cycloramphidae. It is endemic to Brazil. Its natural habitats are subtropical or tropical moist lowland forest and rivers.

Cycloramphus granulosus faces severe population decline primarily due to habitat destruction from urban expansion and agricultural conversion in Brazil's Atlantic Forest region. The species' restricted range and specialized breeding requirements in rocky stream environments make it particularly vulnerable to water pollution and hydrological changes from nearby development. Climate change poses an additional threat by altering precipitation patterns critical for this amphibian's reproductive cycle.

Threat summary

Habitat

This species inhabits rocky streams and adjacent forest areas within Brazil's Atlantic Forest biome, typically found in areas with permanent water flow and dense canopy cover. It requires specific microhabitats including rock crevices and moss-covered surfaces near flowing water for breeding and shelter.

Forest· majorRocky areas· major

Conservation measures underway

Species managementSpecies recoveryEx-situ conservation

Other threatened species in CYCLORAMPHIDAE

EN

Izecksohn's Button Frog

Cycloramphus izecksohni

Declining
CR

Carvalho's Button Frog

Cycloramphus heyeri

Declining
CR

Lutz's River Frog

Thoropa lutzi

Unknown
Brazilian Button FrogEN

Brazilian Button Frog

Cycloramphus brasiliensis

Declining

Frequently asked questions

Why is Granular Button Frog classified as Critically Endangered?
Granular Button Frog is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Cycloramphus granulosus faces severe population decline primarily due to habitat destruction from urban expansion and agricultural conversion in Brazil's Atlantic Forest region. The species' restricted range and specialized breeding requirements in rocky stream environments make it particularly vulnerable to water pollution and hydrological changes from nearby development. Climate change poses an additional threat by altering precipitation patterns critical for this amphibian's reproductive cycle.
Where does Granular Button Frog live?
Granular Button Frog occurs in across multiple regions. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Granular Button Frog?
The main threats to Granular Button Frog are 1.1, 2.1, 2.3, and 5.3. The full IUCN-classified threat record for this species is detailed on the species page.

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