CR

Eurycea nana

Declining

Overview

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

The San Marcos Salamander faces severe threats from groundwater depletion and contamination affecting the San Marcos Springs ecosystem. Urban development and increased water demand in the rapidly growing San Marcos area have reduced spring flow and degraded water quality. Invasive species and recreational activities in Spring Lake further compromise the salamander's extremely limited aquatic habitat.

Threat summary

Habitat

Endemic to the San Marcos Springs system in Texas, inhabiting the clear, constant-temperature spring waters and associated aquatic vegetation. The species is restricted to a single spring complex with stable water temperatures around 22°C year-round.

Rocky areas· major

Conservation measures underway

Species recoveryCompliance and enforcement

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Frequently asked questions

Why is Eurycea nana classified as Critically Endangered?
Eurycea nana 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. The San Marcos Salamander faces severe threats from groundwater depletion and contamination affecting the San Marcos Springs ecosystem. Urban development and increased water demand in the rapidly growing San Marcos area have reduced spring flow and degraded water quality. Invasive species and recreational activities in Spring Lake further compromise the salamander's extremely limited aquatic habitat.
Where does Eurycea nana live?
Eurycea nana occurs in United States. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Eurycea nana?
The main threats to Eurycea nana are 11.1, 5.1, 5.1.1, and 7.1. The full IUCN-classified threat record for this species is detailed on the species page.

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