Asteromyia euthamiae
In 3 days ~10% in a week ~30%
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 Boston on a given day, based on 37 verified sightings from GBIF citizen-science data. It is the 325th most-seen of the 1200 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
August and September
In those months about 10% of wildlife watchers report a Euthamia Leaf Gall Midge in Boston on a given day, against under 5% in October to July, the lowest months.
Yes
Of the 5 cities where we can rate Euthamia Leaf Gall Midge sightings, Boston has the highest daily chance: under 5%. Next come 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 Boston (37 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.
