Diacrita costalis
In 3 days ~20% in a week ~50%
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 Saguaro National Park on a given day, based on 38 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 66th most-seen of the 354 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
October
In that month about 20% of wildlife watchers report a Diacrita costalis in Saguaro National Park on a given day, against under 5% in March, the lowest month. That is one of Saguaro National Park's driest months, with about 15 mm of rain against 55 mm in July.
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.
Yes
Of the 2 parks where we can rate Diacrita costalis sightings, Saguaro National Park has the highest daily chance: about 10%. Next come Big Bend National Park (United States, about 10%).
Same order: Diptera
The closest relatives of the Diacrita costalis that you can see in Saguaro National Park (order Diptera, Flies) are Large Creosote Gall Midge (about 20%), Copestylum marginatum (about 10%) and Isabelle's Bromeliad Fly (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 Saguaro National Park (38 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.
