Sphenella marginata
In 3 days ~10% in a week ~20%
Sphenella marginata is a species of fly in the family Tephritidae, the gall flies. It is found in the Palearctic. The larvae feed on Senecio vulgaris. 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 Ragwort Fly sighting in London on a given day, based on 10 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Ragwort Fly in London on a given day, so our monthly data shows no clear season.
Among the best
Of the 2 cities where we can rate Ragwort Fly sightings, London ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Helsinki (Finland, under 5%).
Same family: Tephritidae
The closest relatives of the Ragwort 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 Ragwort Fly is recorded against all the insects logged in London (10 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.
