Mount Donna Buang Wingless Stonefly

Riekoperla darlingtoni is a small, wingless stonefly in the family Gripopterygidae, restricted to cool, high-elevation streamside habitats. Like other stoneflies, its nymphs are aquatic, developing in clean, well-oxygenated freshwater before emerging as flightless adults that remain close to the stream margin. As a predator and prey item within its larval stage, and a detritivore contributing to organic matter processing, the species plays a role in maintaining freshwater and adjacent terrestrial food web dynamics in montane forest ecosystems.

No precise population figures are documented, but the population trend is decreasing and the species is currently listed as Critically Endangered.

The species is endemic to a very limited area around Mount Donna Buang in Victoria, Australia, occupying cool temperate forest streams and adjoining terrestrial habitat at higher elevations.

Its restricted range makes it especially vulnerable to habitat disturbance. Threats include road and rail infrastructure fragmenting or degrading stream corridors, recreational activities damaging streambanks, and pollution from agricultural and urban runoff. Altered flow regimes from water extraction, stream habitat modification, and increased frequency of drought and flooding events add further pressure.

Fire and fire suppression practices, along with problematic native species interactions, compound risks, while climate change is intensifying temperature and hydrological instability in its narrow montane habitat.

Conservation attention is limited but includes habitat protection measures within existing reserved forest areas, ongoing IUCN Red List monitoring, and broader biodiversity assessments in the region that inform land and water management decisions affecting montane stream ecosystems.

Given its extremely restricted distribution, specialized habitat requirements, and the cumulative, ongoing nature of threats affecting both aquatic and terrestrial components of its habitat, the species' outlook remains precarious, with continued decline expected absent targeted intervention.

This endemic Australian stonefly inhabits cold, fast-flowing mountain streams in the Australian Alps region. The species requires pristine alpine and subalpine waterways with high dissolved oxygen levels and stable temperatures.