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 |
|---|
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Bull Thistle Gall Fly sighting in Melbourne on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 537th most-seen of the 875 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 Bull Thistle Gall Fly in Melbourne on a given day, so our monthly data shows no clear season.
3rd of 4
Of the 4 cities where we can rate Bull Thistle Gall Fly sightings, Melbourne ranks 3rd at under 5%. The best odds are in Auckland (New Zealand, about 10%) and London (United Kingdom, under 5%).
GBIF citizen-science records
It is estimated from how often the Bull Thistle Gall Fly is recorded against all the insects logged in Melbourne (13 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.
