CR

Wandolleck's Button Frog

Cycloramphus ohausi

Unknown

Overview

Cycloramphus ohausi is a species of frog in the family Cycloramphidae. It is endemic to Serra dos Órgãos in southeastern Brazil. The specific name ohausi honors Friedrich Ohaus, a German physicist and herpetologist. Common name Wandolleck's button frog has been proposed for this species.

Cycloramphus ohausi faces severe threats from habitat destruction due to urban expansion and agricultural conversion in its restricted Atlantic Forest range. The species' dependence on pristine stream environments makes it particularly vulnerable to water pollution and sedimentation from nearby human activities. Climate change poses an additional threat by altering precipitation patterns and stream flow regimes essential for its breeding ecology.

Threat summary

Habitat

This critically endangered frog inhabits pristine Atlantic Forest streams and adjacent riparian vegetation in southeastern Brazil. It requires clean, fast-flowing water with rocky substrates for breeding and forested areas with high humidity for terrestrial activities.

Forest· majorForest - Subtropical/tropical moist lowland· major

Conservation measures underway

Species managementSpecies recoveryEx-situ conservation

Other threatened species in CYCLORAMPHIDAE

EN

Izecksohn's Button Frog

Cycloramphus izecksohni

Declining
CR

Petropolis River Frog

Thoropa petropolitana

Unknown
CR

Lutz's River Frog

Thoropa lutzi

Unknown
Brazilian Button FrogEN

Brazilian Button Frog

Cycloramphus brasiliensis

Declining

Frequently asked questions

Why is Wandolleck's Button Frog classified as Critically Endangered?
Wandolleck's 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 ohausi faces severe threats from habitat destruction due to urban expansion and agricultural conversion in its restricted Atlantic Forest range. The species' dependence on pristine stream environments makes it particularly vulnerable to water pollution and sedimentation from nearby human activities. Climate change poses an additional threat by altering precipitation patterns and stream flow regimes essential for its breeding ecology.
Where does Wandolleck's Button Frog live?
Wandolleck's 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 Wandolleck's Button Frog?
The main threats to Wandolleck's Button Frog are 2.1, 2.3, 5.3, and 7.1. The full IUCN-classified threat record for this species is detailed on the species page.

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