Diacrita costalis
In 3 days ~20% in a week ~40%
Diacrita costalis is a species of ulidiid or picture-winged fly in the genus Diacrita of the family Tephritidae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Saguaro National Park | 🇺🇸 United States | |
| 2 | Big Bend National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Phoenix | 🇺🇸 United States | |
| 2 | Mexico City | 🇲🇽 México | |
| 3 | Los Angeles | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Diacrita costalis sighting in Big Bend National Park on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 155th most-seen of the 329 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
March–May and November–December
In those months about 10% of wildlife watchers report a Diacrita costalis in Big Bend National Park on a given day, against under 5% in January–February and June–October, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Diacrita costalis sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 2 parks where we can rate Diacrita costalis sightings, Big Bend National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Saguaro National Park (United States, about 10%).
Same order: Diptera
The closest relatives of the Diacrita costalis that you can see in Big Bend National Park (order Diptera, Flies) are Large Creosote Gall Midge (about 20%), Yellow-Spotted Bromeliad Fly (about 10%) and Copestylum marginatum (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Diacrita costalis is recorded against all the insects logged in Big Bend National Park (12 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.
