Acraspis quercushirta
In 3 days ~10% in a week ~20%
Acraspis quercushirta, the jewel oak gall wasp, is a species of gall wasp in the family Cynipidae, tribe Cynipini (oak gall wasps), found in North America. Hosts are white oaks, including bur oak, Gambel oak, Chapman oak, swamp chestnut oak, and chestnut oak.
Like most oak gall wasps, this species has two generations per year - one asexual (or agamic) and one sexual, with each generation producing distinct galls. The wingless females of the asexual generation emerge from their galls in fall and climb up an oak tree to oviposit in bud scales thereby inducing the gall development. These inconspicuous galls and their larval inhabitants overwinter and continue their development in spring before adults emerge in late May and early June. These sexual generation adults mate and the females oviposit on veins on the underside of host leaves. The induced gall is detachable, oval in shape, and the color can range from white to yellowish to tan or brown. The surface is fissured into facets that end in a short, hard point, reminiscent of jewelry. These galls typically fall with the leaves in autumn with the asexual female adults emerging shortly thereafter.
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Calgary | 🇨🇦 Canada | |
| 2 | Edmonton | 🇨🇦 Canada | |
| 3 | Detroit | 🇺🇸 United States | |
| 4 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 5 | Chicago | 🇺🇸 United States | |
| 6 | Salt Lake City | 🇺🇸 United States | |
| 7 | Washington | 🇺🇸 United States | |
| 8 | Toronto | 🇨🇦 Canada | |
| 9 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Jewel Oak Gall Wasp sighting in Minneapolis [Saint Paul] on a given day, based on 26 verified sightings from GBIF citizen-science data. It is the 268th most-seen of the 672 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.
September
In that month about 10% of wildlife watchers report a Jewel Oak Gall Wasp in Minneapolis [Saint Paul] on a given day, against under 5% in October to August, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Jewel Oak Gall Wasp sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 9
Of the 9 cities where we can rate Jewel Oak Gall Wasp sightings, Minneapolis [Saint Paul] ranks 4th at under 5%. The best odds are in Calgary (Canada, about 10%), Edmonton (Canada, about 10%) and Detroit (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Jewel Oak Gall Wasp is recorded against all the insects logged in Minneapolis [Saint Paul] (26 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.
