CR

Megalagrion williamsoni

Unknown

Overview

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

Megalagrion williamsoni faces severe threats from habitat destruction due to urban development and agricultural expansion across its limited Hawaiian range. Introduced species, particularly non-native fish and invertebrates, compete with and prey upon native damselfly larvae in freshwater streams. Stream modification and water diversion for human use have degraded the pristine aquatic habitats essential for this species' reproduction and survival.

Threat summary

Habitat

This endemic Hawaiian damselfly inhabits pristine freshwater streams and associated riparian vegetation in native forest areas. The species requires clean, flowing water with minimal human disturbance for successful larval development and adult reproduction.

Other threatened species in COENAGRIONIDAE

VU

Pseudagrion samoense

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Africallagma quingentum

Unknown
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Pseudagrion coarctatum

Unknown

Threatened in United States

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Lepiota echinella

Unknown
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Polyodon spathula

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Carcharhinus brachyurus

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EN

Lyophyllum deliberatum

Unknown

Frequently asked questions

Why is Megalagrion williamsoni classified as Critically Endangered?
Megalagrion williamsoni 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. Megalagrion williamsoni faces severe threats from habitat destruction due to urban development and agricultural expansion across its limited Hawaiian range. Introduced species, particularly non-native fish and invertebrates, compete with and prey upon native damselfly larvae in freshwater streams. Stream modification and water diversion for human use have degraded the pristine aquatic habitats essential for this species' reproduction and survival.
Where does Megalagrion williamsoni live?
Megalagrion williamsoni occurs in United States. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Megalagrion williamsoni?
The main threats to Megalagrion williamsoni are 5.4, 8.1, ai-1, and ai-2. The full IUCN-classified threat record for this species is detailed on the species page.

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