CR

Ogasawarana chichijimana

Unknown

Overview

Ogasawarana chichijimana is a species of land snail with an operculum, a terrestrial gastropod mollusk in the family Helicinidae, the helicinids.

Ogasawarana chichijimana faces severe threats from invasive species, particularly the introduced flatworm Platydemus manokwari, which preys directly on native land snails. Habitat degradation from invasive plants and human development on Chichijima Island has further reduced suitable forest environments. The species' extremely restricted range on a single small island makes it exceptionally vulnerable to any environmental changes or catastrophic events.

Threat summary

Habitat

This endemic land snail inhabits the native forest environments of Chichijima Island in the Ogasawara Islands, Japan. It requires humid forest conditions with appropriate leaf litter and vegetation for shelter and feeding.

Other threatened species in HELICINIDAE

Ogasawarana rexCR

Ogasawarana rex

Unknown
CR

Ogasawarana metamorpha

Unknown
EN

Helicina rostrata

Unknown
CR

Ogasawarana habei

Unknown

Frequently asked questions

Why is Ogasawarana chichijimana classified as Critically Endangered?
Ogasawarana chichijimana 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. Ogasawarana chichijimana faces severe threats from invasive species, particularly the introduced flatworm Platydemus manokwari, which preys directly on native land snails. Habitat degradation from invasive plants and human development on Chichijima Island has further reduced suitable forest environments. The species' extremely restricted range on a single small island makes it exceptionally vulnerable to any environmental changes or catastrophic events.
Where does Ogasawarana chichijimana live?
Ogasawarana chichijimana 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 Ogasawarana chichijimana?
The main threats to Ogasawarana chichijimana 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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