Nesameletus ornatus
In 3 days ~20% in a week ~50%
Nesameletus ornatus, commonly known as the small swimming mayfly, is a species of mayfly in the Nesameletidae family. It is endemic to New Zealand. It was first described by Alfred Edwin Eaton in 1883. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Egmont National Park | 🇳🇿 New Zealand |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Small Swimming Mayfly sighting in Egmont National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 153rd most-seen of the 191 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
March, May–June and August
In those months about 20% of wildlife watchers report a Small Swimming Mayfly in Egmont National Park on a given day, against under 5% in April, July and September–February, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Small Swimming Mayfly sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Egmont National Park, in our data
Egmont National Park is the only park on Wallace's Line with enough records to rate Small Swimming Mayfly sightings: about 10% of wildlife watchers there report one on a given day.
Same order: Ephemeroptera
The closest relatives of the Small Swimming Mayfly that you can see in Egmont National Park (order Ephemeroptera, Mayflies) are Spinygilled Mayfly (about 30%), Ameletopsis perscitus (about 20%) and Acanthophlebia cruentata (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Small Swimming Mayfly is recorded against all the insects logged in Egmont National Park (6 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.
