CR

Lutz's River Frog

Thoropa lutzi

Unknown

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Thoropa lutzi faces severe threats from urban expansion and infrastructure development within its extremely limited range in Rio de Janeiro state, Brazil. The species' dependence on specific rocky stream habitats makes it particularly vulnerable to water pollution from urban runoff and sewage discharge. Habitat fragmentation from road construction and residential development has isolated remaining populations, reducing genetic diversity and limiting dispersal opportunities.

Threat summary

Habitat

This species inhabits rocky streams and seepages in Atlantic Forest remnants of southeastern Brazil, particularly areas with granite outcrops and cascading water. It requires clean, well-oxygenated water flowing over rocky substrates in forested environments.

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

Petropolis River Frog

Thoropa petropolitana

Unknown
Brazilian Button FrogEN

Brazilian Button Frog

Cycloramphus brasiliensis

Declining
CR

Santa Catarina Button Frog

Cycloramphus catarinensis

Unknown

Threatened in Brazil

Striped SmoothhoundCR

Striped Smoothhound

Mustelus fasciatus

Declining
VU

Mussismilia hispida

Declining
VU

Myrcia carioca

Declining
Brasilia TapaculoEN

Brasilia Tapaculo

Scytalopus novacapitalis

Declining

Frequently asked questions

Why is Lutz's River Frog classified as Critically Endangered?
Lutz's River 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. Thoropa lutzi faces severe threats from urban expansion and infrastructure development within its extremely limited range in Rio de Janeiro state, Brazil. The species' dependence on specific rocky stream habitats makes it particularly vulnerable to water pollution from urban runoff and sewage discharge. Habitat fragmentation from road construction and residential development has isolated remaining populations, reducing genetic diversity and limiting dispersal opportunities.
Where does Lutz's River Frog live?
Lutz's River Frog occurs in Brazil. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Lutz's River Frog?
The main threats to Lutz's River Frog are 8.1, ai-1, ai-2, and ai-3. The full IUCN-classified threat record for this species is detailed on the species page.

Get weekly conservation intelligence

One short digest a week of the most striking species and country data we ship, plus breaking conservation news paired with our database where it matters.

Free, no spam. One-click unsubscribe in every email.