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 →
| # | Park | Country | Daily sighting probability |
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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 Paris on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 827th most-seen of the 916 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.
July
In that month about 10% of wildlife watchers report a Banded Burdock Fly in Paris on a given day, against under 5% in August to June, the lowest months.
3rd of 4
Of the 4 cities where we can rate Banded Burdock Fly sightings, Paris ranks 3rd at under 5%. The best odds are in Helsinki (Finland, about 10%) and London (United Kingdom, under 5%).
GBIF citizen-science records
It is estimated from how often the Banded Burdock Fly is recorded against all the insects logged in Paris (5 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.
