Ensina sonchi
In 3 days ~10% in a week ~20%
Ensina sonchi is a species of fly in the family Tephritidae, the gall flies. It is found in the Palearctic. The head is light yellow head. Greenish body with yellow villae. The disc of the mesonotum is blackish. Black mesophragm. The legs and halteres are dirty yellow. Wings vitreous or opaline. Abdomen black: tergites tightly yellow at posterior margin with black villi; rufous sternites; Macrochaetes yellowish. Oviscapte black, apex and sides rufous, with fine, yellowish villi. -Long. : 3-3.5 mm. The larvae feed on the flower heads of Asteraceae (Chondrilla juncea, Cirsium arvense, Cirsium vulgare, Hieracium umbellatum, Hypochaeris radicata Sonchus arvensis, Taraxacum officinale....).
United Kingdom & Scandinavia South to North Africa, East to Japan; introduced to Ethiopia, Taiwan, Philippines, Hawaii. Bladmineerders. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Saint Petersburg | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Sow-Thistle Fly sighting in Saint Petersburg on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 377th most-seen of the 448 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.
August
In that month about 10% of wildlife watchers report a Sow-Thistle Fly in Saint Petersburg on a given day, against under 5% in September to July, the lowest months. That is one of Saint Petersburg's wettest months, with about 100 mm of rain against 40 mm in February.
Only Saint Petersburg, in our data
Saint Petersburg is the only city on Wallace's Line with enough records to rate Sow-Thistle Fly sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Sow-Thistle Fly is recorded against all the insects logged in Saint Petersburg (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.
