Copestylum vesicularium
In 3 days ~10% in a week ~30%
Copestylum vesicularium, the iridescent bromeliad fly, is a species of syrphid fly in the family Syrphidae. This species is widely distributed on the eastern half of North America. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Washington | 🇺🇸 United States | |
| 2 | Houston | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an Iridescent Bromeliad Fly sighting in Shenandoah National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 630th most-seen of the 723 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.
April and May
In those months about 10% of wildlife watchers report an Iridescent Bromeliad Fly in Shenandoah National Park on a given day, against under 5% in June to March, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Iridescent Bromeliad Fly sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
2nd of 2
Of the 2 parks where we can rate Iridescent Bromeliad Fly sightings, Shenandoah National Park ranks 2nd at under 5%. The best odds are in Great Smoky Mountains National Park (United States, about 10%).
Same family: Syrphidae
The closest relatives of the Iridescent Bromeliad Fly that you can see in Shenandoah National Park (family Syrphidae, Hover Flies) are Eastern Calligrapher (about 20%), Common Drone Fly (about 20%) and Black-Horned Smoothtail (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Iridescent Bromeliad Fly is recorded against all the insects logged in Shenandoah National Park (5 verified sightings from 2019 to 2026), 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.
