Tomostethus nigritus
In 3 days ~10% in a week ~20%
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland |
Rare
Under 5% of wildlife watchers report a Black Ash Sawfly sighting in Helsinki on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 732nd most-seen of the 838 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
June
In that month about 10% of wildlife watchers report a Black Ash Sawfly in Helsinki on a given day, against under 5% in July to May, the lowest months.
Only Helsinki, in our data
Helsinki is the only city on Wallace's Line with enough records to rate Black Ash Sawfly sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Tenthredinidae
The closest relatives of the Black Ash Sawfly that you can see in Helsinki (family Tenthredinidae, Common Sawflies) are Turnip Sawfly (about 10%), Willow Redgall Sawfly (about 10%) and Tenthredo campestris (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black Ash Sawfly is recorded against all the insects logged in Helsinki (6 verified sightings), 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.
