Neuroterus anthracinus
In 3 days ~20% in a week ~40%
Neuroterus anthracinus is a widely distributed gall wasp that forms chemically induced leaf galls on oak trees. N. anthracinus has both sexual and agamic generations and in consequence forms two distinct galls, the oyster gall and April-bud gall. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | London | 🇬🇧 United Kingdom | |
| 2 | Budapest | 🇭🇺 Hungary | |
| 3 | Liverpool | 🇬🇧 United Kingdom | |
| 4 | Vienna | 🇦🇹 Austria | |
| 5 | Birmingham | 🇬🇧 United Kingdom | |
| 6 | Vancouver | 🇨🇦 Canada | |
| 7 | Manchester | 🇬🇧 United Kingdom | |
| 8 | Helsinki | 🇫🇮 Finland | |
| 9 | Paris | 🇫🇷 France | |
| 10 | Prague | 🇨🇿 Czechia |
With luck
About 10% of wildlife watchers report an Oyster Gall Wasp sighting in Snowdonia National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 294th most-seen of the 387 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
September
In that month about 20% of wildlife watchers report an Oyster Gall Wasp in Snowdonia National Park on a given day, against under 5% in November to July, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Oyster Gall Wasp sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Snowdonia National Park, in our data
Snowdonia National Park is the only park on Wallace's Line with enough records to rate Oyster Gall Wasp sightings: about 10% of wildlife watchers there report one on a given day.
Same genus: Neuroterus
The closest relatives of the Oyster Gall Wasp that you can see in Snowdonia National Park (genus Neuroterus) are Common Spangle Gall Wasp (about 10%) and Silk-Button Spangle Gall Wasp (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Oyster Gall Wasp is recorded against all the insects logged in Snowdonia 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.
