Terellia tussilaginis
In 3 days ~10% in a week ~30%
Terellia tussilaginis, the gall fly, is a species of tephritid or fruit flies in the family Tephritidae. This species is present in most of Europe, in European Russia and in the East Palearctic ecozone. These flies inhabit meadows, gardens and where the host plants grow.
Terellia tussilaginis can reach a body length of about 5 millimetres (0.20 in). These fruit flies have a pale green yellow body with distinctive brown banding on its wings. The costal cell is completely hyaline. Katepisternum shows reddish spots. The anterior half of mesonotum is reddish to brown. Tergite 4 is usually black.
Adults can be seen from June to August. The larvae live in the flowerheads of Arctium lappa, Arctium minus, Arctium tomentosum and Cirsium vulgare, feeding on them and causing galls to form. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Banded Burdock Fly sighting in Helsinki on a given day, based on 35 verified sightings from GBIF citizen-science data. It is the 325th 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 30%, if each day is a fresh chance.
June and July
In those months about 10% of wildlife watchers report a Banded Burdock Fly in Helsinki on a given day, against under 5% in August to May, the lowest months.
Yes
Of the 4 cities where we can rate Banded Burdock Fly sightings, Helsinki has the highest daily chance: about 10%. Next come London (United Kingdom, under 5%) and Paris (France, under 5%).
Same family: Tephritidae
The closest relatives of the Banded Burdock Fly that you can see in Helsinki (family Tephritidae, Fruit Flies) are Burdock Fly (about 10%) and Mottled Thistle Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Banded Burdock Fly is recorded against all the insects logged in Helsinki (35 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.
