Terellia tussilaginis
In 3 days ~10% in a week ~20%
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 →
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Banded Burdock Fly sighting in London on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 1005th most-seen of the 1504 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Banded Burdock Fly in London on a given day, so our monthly data shows no clear season.
2nd of 4
Of the 4 cities where we can rate Banded Burdock Fly sightings, London ranks 2nd at under 5%. The best odds are in Helsinki (Finland, about 10%).
Same family: Tephritidae
The closest relatives of the Banded Burdock Fly that you can see in London (family Tephritidae, Fruit Flies) are Thistle Stem Gall Fly (about 10%) and Celery 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 London (11 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.
