CR

Marstoniopsis armoricana

DecliningCREUCREU

Overview

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

Marstoniopsis armoricana faces severe threats from habitat degradation and water pollution in its limited freshwater spring systems across Brittany, France. Agricultural runoff and urban development have contaminated the pristine spring waters this endemic gastropod requires, while water extraction for human use has reduced flow rates in critical habitats. The species' extremely restricted range makes it particularly vulnerable to localized environmental changes.

Threat summary

Habitat

This endemic freshwater gastropod inhabits pristine spring systems and associated slow-flowing streams in Brittany, northwestern France. It requires clean, well-oxygenated waters with stable temperatures and specific mineral compositions typical of limestone spring environments.

FRESHWATER· major

Conservation measures underway

Species recovery

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CR

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Frequently asked questions

Why is Marstoniopsis armoricana classified as Critically Endangered?
Marstoniopsis armoricana 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. Marstoniopsis armoricana faces severe threats from habitat degradation and water pollution in its limited freshwater spring systems across Brittany, France. Agricultural runoff and urban development have contaminated the pristine spring waters this endemic gastropod requires, while water extraction for human use has reduced flow rates in critical habitats. The species' extremely restricted range makes it particularly vulnerable to localized environmental changes.
Where does Marstoniopsis armoricana live?
Marstoniopsis armoricana occurs in France. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Marstoniopsis armoricana?
The main threats to Marstoniopsis armoricana 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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