CR

Opisthostoma inornatum

Declining

Overview

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

Opisthostoma inornatum faces severe threats from limestone quarrying and mining activities that directly destroy its cave and karst habitat in Peninsular Malaysia. The species' extremely restricted range makes it particularly vulnerable to habitat modification, while agricultural expansion and urban development in surrounding areas fragment remaining suitable habitat. Climate change poses additional risks through altered moisture regimes that could affect the delicate microhabitat conditions this cave-dwelling snail requires.

Threat summary

Habitat

This species inhabits limestone caves and karst formations in tropical rainforest areas of Peninsular Malaysia. It requires specific microhabitat conditions including stable humidity levels and calcium-rich substrates typical of cave environments.

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

Other threatened species in DIPLOMMATINIDAE

EN

Diplommatina pyramis

Unknown
CR

Opisthostoma perspectivum

Declining
VU

Opisthostoma bihamulatum

Stable
CR

Opisthostoma fraternum

Declining

Threatened in Malaysia

Acropora hemprichiiEN

Acropora hemprichii

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VU

Podocarpus ridleyi

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EN

Benstonea saint-johnii

Unknown
VU

Hopea coriacea

Declining

Frequently asked questions

Why is Opisthostoma inornatum classified as Critically Endangered?
Opisthostoma inornatum 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 inornatum faces severe threats from limestone quarrying and mining activities that directly destroy its cave and karst habitat in Peninsular Malaysia. The species' extremely restricted range makes it particularly vulnerable to habitat modification, while agricultural expansion and urban development in surrounding areas fragment remaining suitable habitat. Climate change poses additional risks through altered moisture regimes that could affect the delicate microhabitat conditions this cave-dwelling snail requires.
Where does Opisthostoma inornatum live?
Opisthostoma inornatum 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 inornatum?
The main threats to Opisthostoma inornatum are 3.2, 5.3, 7.1, and ai-1. The full IUCN-classified threat record for this species is detailed on the species page.

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