Asteromyia euthamiae
In 3 days ~10% in a week ~20%
Asteromyia euthamiae is a species of gall midge in the family Cecidomyiidae. It was described as a new species in 1968 by the entomologist Raymond Gagné. It is widely distributed in northern North America, where it causes galls on Euthamia plants, including Euthamia caroliniana, Euthamia graminifolia, and Euthamia leptocephala. The galls are typically 3–10 mm (0.12–0.39 in) in length and vary in shape depending on the leaf width. They can be rounded, elliptical, or elongate-elliptical in appearance. The galls are usually black, but may have a distinctive narrow margin in shades of yellow, white, or purple. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Chicago | 🇺🇸 United States | |
| 3 | Washington | 🇺🇸 United States | |
| 4 | New York City | 🇺🇸 United States | |
| 5 | Toronto | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Euthamia Leaf Gall Midge sighting in Chicago on a given day, based on 14 verified sightings from GBIF citizen-science data. It is the 520th most-seen of the 978 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 Euthamia Leaf Gall Midge in Chicago on a given day, so our monthly data shows no clear season.
Among the best
Of the 5 cities where we can rate Euthamia Leaf Gall Midge sightings, Chicago ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Boston (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Euthamia Leaf Gall Midge is recorded against all the insects logged in Chicago (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.
