EN

Thermosphaeroma milleri

Unknown

Overview

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

Thermosphaeroma milleri faces severe threats from groundwater depletion and contamination in its extremely limited range within California's Central Valley. Agricultural pumping and urban development have lowered water tables, while pesticide runoff and industrial pollutants degrade the quality of remaining thermal spring habitats. The species' restriction to a handful of thermal springs makes it exceptionally vulnerable to any localized disturbance or water source modification.

Threat summary

Habitat

This endemic isopod inhabits thermal springs and associated warm groundwater systems in California's Central Valley. The species requires specific temperature ranges and water chemistry conditions found only in these geothermally-influenced aquatic environments.

FRESHWATER· major

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Unknown

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Frequently asked questions

Why is Thermosphaeroma milleri classified as Endangered?
Thermosphaeroma milleri is classified as Endangered — facing a very high risk of extinction in the wild — because population numbers are declining steeply and key habitats are under sustained pressure. Thermosphaeroma milleri faces severe threats from groundwater depletion and contamination in its extremely limited range within California's Central Valley. Agricultural pumping and urban development have lowered water tables, while pesticide runoff and industrial pollutants degrade the quality of remaining thermal spring habitats. The species' restriction to a handful of thermal springs makes it exceptionally vulnerable to any localized disturbance or water source modification.
Where does Thermosphaeroma milleri live?
Thermosphaeroma milleri occurs in Mexico. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Thermosphaeroma milleri?
The main threats to Thermosphaeroma milleri are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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