Euaresta aequalis
In 3 days ~10%
Euaresta aequalis is a species of fruit fly in the genus Euaresta of the family Tephritidae. E. aequalis has elaborate markings on its wings, characteristic of the family Tephritidae, and brilliant green eyes. The diagnostic characters for this species are a tan or yellow body with a clear round spot on the wing in cell r4+5, separated from the wing margin by distinct brown band. All North American species of the genus Euaresta except E. aequalis and festiva have a base color of dark brown to black. This species is generally the largest of the North American Euaresta. It is commonly known as the burr-seed fly.
E. aequalis is distributed widely across the United States and southern Canada. The species was first observed in Mexico in 1969, in Baja California. It was introduced to Australia in the 1930s in an attempt to control invasive cocklebur.
E. aequalis is a specialist—its only known host is the common or rough cocklebur, Xanthium strumarium. Females of this species have large ovipositors for laying eggs inside the hard burr capsule, which is protected by spines. The larva develops inside this capsule, feeding on one of the two... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Toronto | 🇨🇦 Canada | |
| 2 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Euaresta aequalis 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 Euaresta aequalis in Toronto on a given day, so our monthly data shows no clear season.
Yes
Of the 2 cities where we can rate Euaresta aequalis sightings, Toronto has the highest daily chance: under 5%. Next come New York City (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Euaresta aequalis 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.
