CR

Amastra cylindrica

Unknown

Overview

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

Amastra cylindrica faces severe threats from habitat destruction as native Hawaiian forests are cleared for development and agriculture. Invasive plant species alter the forest understory composition, reducing suitable microhabitats for this endemic snail. Predation by introduced species, particularly the rosy wolf snail (Euglandina rosea), has devastated native Hawaiian snail populations including this species. Climate change-induced shifts in rainfall patterns and temperature further stress remaining populations in their restricted montane forest habitat.

Threat summary

Habitat

Amastra cylindrica inhabits native montane forests in Hawaii, typically found in moist understory environments among leaf litter and on native vegetation. The species requires specific microclimate conditions with high humidity and stable temperatures found in intact native forest ecosystems.

TERRESTRIAL· major

Frequently asked questions

Why is Amastra cylindrica classified as Critically Endangered?
Amastra cylindrica 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. Amastra cylindrica faces severe threats from habitat destruction as native Hawaiian forests are cleared for development and agriculture. Invasive plant species alter the forest understory composition, reducing suitable microhabitats for this endemic snail. Predation by introduced species, particularly the rosy wolf snail (Euglandina rosea), has devastated native Hawaiian snail populations including this species. Climate change-induced shifts in rainfall patterns and temperature further stress remaining populations in their restricted montane forest habitat.
Where does Amastra cylindrica live?
Amastra cylindrica occurs in across multiple regions. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Amastra cylindrica?
The main threats to Amastra cylindrica 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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