Urophora stylata
In 3 days ~10% in a week ~20%
Urophora stylata is a species of tephritid or fruit flies in the genus Urophora of the family Tephritidae. The host plant for the larvae is usually a thistle of genus Cirsium or Carduus. It has been introduced in North America as a biocontrol of C. vulgare, which has become an invasive species.
Throughout Europe East to Japan; introduced to India, Pakistan, Australia, North America. 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 Bull Thistle Gall Fly sighting in London on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 1059th 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.
June
In that month about 10% of wildlife watchers report a Bull Thistle Gall Fly in London on a given day, against under 5% in July to May, the lowest months.
2nd of 4
Of the 4 cities where we can rate Bull Thistle Gall Fly sightings, London ranks 2nd at under 5%. The best odds are in Auckland (New Zealand, about 10%).
GBIF citizen-science records
It is estimated from how often the Bull Thistle Gall 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.
