Eusthenia nothofagi
In 3 days ~10% in a week ~30%
Eusthenia nothofagi is a species of stonefly in the family Eustheniidae. It is endemic to Australia, where its range is restricted to Victoria. It is known only from the Otway Ranges and its common name is the Otway stonefly.
This insect lives in streams in temperate rainforest dominated by myrtle beech (Nothofagus cunninghamii) and wet sclerophyll dominated by mountain ash (Eucalyptus regnans). This species was described in 1979. It is similar to Eusthenia venosa, but its wings are more red than solid purple.
This species is considered to be "vulnerable". Threats include climate change and clearing of the local forest habitat. As of 1991 the insect was thought to be extinct, but subsequent surveys recorded its distribution. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Otway National Park | 🇦🇺 Australia |
More parks will be added in future updates.
No species of the same family or order lives in Great Otway National Park, so these are its closest relatives here: other insects.
Rare
Under 5% of wildlife watchers report an Otway Stonefly sighting in Great Otway National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 369th most-seen of the 418 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
December to March
In those months about 10% of wildlife watchers report an Otway Stonefly in Great Otway National Park on a given day, against under 5% in April to November, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Otway Stonefly sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Only Great Otway National Park, in our data
Great Otway National Park is the only park on Wallace's Line with enough records to rate Otway Stonefly sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Otway Stonefly is recorded against all the insects logged in Great Otway National Park (5 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
