Large Saltmarsh Conch
VU

Large Saltmarsh Conch

Phalonidia affinitana

Unknown

Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Phalonidia_affinitana

Overview

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

The Large Saltmarsh Conch faces severe pressure from coastal development and habitat modification throughout its limited range. Rising sea levels and increased storm intensity associated with climate change threaten to inundate or alter the specific salinity gradients required by this specialized gastropod. Agricultural runoff and urban pollution have degraded water quality in many saltmarsh systems, while recreational activities and shoreline hardening further fragment suitable habitat.

Threat summary

Habitat

This species inhabits brackish saltmarsh environments along temperate coastlines, particularly in areas where freshwater meets saltwater in protected bays and estuaries. It requires specific salinity gradients and muddy substrates with abundant organic matter, typically found in the mid to upper intertidal zones of established saltmarsh systems.

TERRESTRIAL· major

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Frequently asked questions

Why is Large Saltmarsh Conch classified as Vulnerable?
Large Saltmarsh Conch is classified as Vulnerable because the population is declining and the species faces a high risk of extinction in the medium-term future if current pressures continue. The Large Saltmarsh Conch faces severe pressure from coastal development and habitat modification throughout its limited range. Rising sea levels and increased storm intensity associated with climate change threaten to inundate or alter the specific salinity gradients required by this specialized gastropod. Agricultural runoff and urban pollution have degraded water quality in many saltmarsh systems, while recreational activities and shoreline hardening further fragment suitable habitat.
Where does Large Saltmarsh Conch live?
Large Saltmarsh Conch occurs in Austria, Belgium, Denmark, France, Germany, and Greece (plus 10 other countries). Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Large Saltmarsh Conch?
The main threats to Large Saltmarsh Conch 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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