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 |
|---|
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Ragwort Fly sighting in Helsinki on a given day, based on 14 verified sightings from GBIF citizen-science data. It is the 665th most-seen of the 838 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.
September
In that month about 10% of wildlife watchers report a Ragwort Fly in Helsinki on a given day, against under 5% in October to August, the lowest months.
Yes
Of the 2 cities where we can rate Ragwort Fly sightings, Helsinki has the highest daily chance: under 5%. Next come London (United Kingdom, under 5%).
Same family: Tephritidae
The closest relatives of the Ragwort Fly that you can see in Helsinki (family Tephritidae, Fruit Flies) are Burdock Fly (about 10%), Banded Burdock Fly (about 10%) and Mottled Thistle 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 Helsinki (14 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.
