CR

Opisthostoma fraternum

Declining

Overview

Opisthostoma fraternum is a species of small land snail with an operculum, a terrestrial gastropod mollusc in the family Diplommatinidae. It is endemic to Malaysia. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.

Opisthostoma fraternum faces severe threats from limestone quarrying and mining activities that directly destroy its specialized cave and karst habitats. The species' extremely restricted range makes it particularly vulnerable to habitat modification, as even small-scale disturbances can eliminate entire populations. Agricultural expansion and urban development in surrounding areas further fragment the remaining suitable habitat.

Threat summary

Habitat

This micro-endemic land snail inhabits limestone caves and karst formations in tropical Southeast Asia. It requires specific microhabitat conditions within cave systems, including stable humidity and temperature regimes found in limestone crevices and cave entrances.

Forest - Subtropical/tropical moist lowland· majorRocky areas· major

Frequently asked questions

Why is Opisthostoma fraternum classified as Critically Endangered?
Opisthostoma fraternum 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 fraternum faces severe threats from limestone quarrying and mining activities that directly destroy its specialized cave and karst habitats. The species' extremely restricted range makes it particularly vulnerable to habitat modification, as even small-scale disturbances can eliminate entire populations. Agricultural expansion and urban development in surrounding areas further fragment the remaining suitable habitat.
Where does Opisthostoma fraternum live?
Opisthostoma fraternum 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 fraternum?
The main threats to Opisthostoma fraternum are 3.2, 5.3, 8.3, and ai-1. The full IUCN-classified threat record for this species is detailed on the species page.

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