CR

Opisthostoma jucundum

Declining

Overview

Opisthostoma jucundum is a species of land snail with an operculum, a terrestrial gastropod mollusc in the family Diplommatinidae.

Opisthostoma jucundum faces severe threats from limestone quarrying and mining activities that directly destroy its specialized cave and karst habitat. The species' extremely restricted range on Langkawi Island makes it particularly vulnerable to habitat modification, while tourism development and infrastructure expansion continue to fragment remaining suitable areas. Climate change poses additional risks through altered humidity and temperature regimes within cave systems.

Threat summary

Habitat

This micro-endemic land snail inhabits limestone caves and karst formations on Langkawi Island, Malaysia. It requires specific microhabitat conditions within cave systems, including stable humidity levels and calcium-rich substrates typical of tropical limestone environments.

Forest· majorMarine coastal/supratidal· majorRocky areas· major

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Frequently asked questions

Why is Opisthostoma jucundum classified as Critically Endangered?
Opisthostoma jucundum 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. Opisthostoma jucundum faces severe threats from limestone quarrying and mining activities that directly destroy its specialized cave and karst habitat. The species' extremely restricted range on Langkawi Island makes it particularly vulnerable to habitat modification, while tourism development and infrastructure expansion continue to fragment remaining suitable areas. Climate change poses additional risks through altered humidity and temperature regimes within cave systems.
Where does Opisthostoma jucundum live?
Opisthostoma jucundum occurs in Malaysia. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Opisthostoma jucundum?
The main threats to Opisthostoma jucundum are 5.3, ai-1, ai-2, and ai-3. The full IUCN-classified threat record for this species is detailed on the species page.

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