Cystiphora sonchi
In 3 days ~10% in a week ~20%
Cystiphora sonchi is a species of gall midge in the family Cecidomyiidae. It is native to Eurasia, but has been introduced to North America as a biocontrol of sow thistles. The larvae cause small, circular galls on the leaves of the host plants. Several species of parasitic wasps use the larvae as hosts.
This species was first described as Cecidomyia sonchi by Swiss entomologist Johann Jacob Bremi-Wolf in 1847. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Elk Island National Park | 🇨🇦 Canada | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report a Cystiphora sonchi sighting in Wadden Sea National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 699th most-seen of the 818 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 Cystiphora sonchi in Wadden Sea National Park on a given day, against under 5% in September to July, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Cystiphora sonchi sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 parks where we can rate Cystiphora sonchi sightings, Wadden Sea National Park ranks 2nd at under 5%. The best odds are in Elk Island National Park (Canada, about 10%).
GBIF citizen-science records
It is estimated from how often the Cystiphora sonchi is recorded against all the insects logged in Wadden Sea National Park (5 verified sightings from 2019 to 2026), 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.
