CR

Achatinella stewartii

Unknown

Overview

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

Achatinella stewartii faces severe population decline primarily due to predation by introduced species, particularly the rosy wolfsnail (Euglandina rosea) and various rat species that consume both adults and eggs. Habitat degradation from invasive plant species and feral ungulates has further reduced suitable native forest areas. The species' extremely limited range on O'ahu makes it particularly vulnerable to localized extinctions, with remaining populations fragmented across small forest patches.

Threat summary

Habitat

This endemic Hawaiian tree snail inhabits native mesic and wet forests on O'ahu, typically found on native trees and shrubs in montane forest areas. The species requires intact native forest canopy and understory vegetation for shelter and feeding on fungal films growing on plant surfaces.

TERRESTRIAL· major

Other threatened species in ACHATINELLIDAE

VU

Lamellidea biplicata

Unknown
VU

Lamellidea ogasawarana

Unknown
EN

Newcombia lirata

Unknown
EN

Newcombia canaliculata

Unknown

Frequently asked questions

Why is Achatinella stewartii classified as Critically Endangered?
Achatinella stewartii 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. Achatinella stewartii faces severe population decline primarily due to predation by introduced species, particularly the rosy wolfsnail (Euglandina rosea) and various rat species that consume both adults and eggs. Habitat degradation from invasive plant species and feral ungulates has further reduced suitable native forest areas. The species' extremely limited range on O'ahu makes it particularly vulnerable to localized extinctions, with remaining populations fragmented across small forest patches.
Where does Achatinella stewartii live?
Achatinella stewartii 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 Achatinella stewartii?
The main threats to Achatinella stewartii 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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