Asteromyia euthamiae
In 3 days ~10%
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 Toronto on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 1410th most-seen of the 1689 insects we can rate there. Over three days the chance rises to about 10%, 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 Toronto 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, Toronto ranks 5th at under 5%, level with the leaders once rounded. The best odds are in Boston (United States, under 5%), Chicago (United States, under 5%) and Washington (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 Toronto (6 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.
