Chloromyia formosa
In 3 days ~20% in a week ~40%
Chloromyia formosa is a species of soldier flies belonging to the family Stratiomyidae. Another name for it is Broad centurion. This species is present in most of Europe (Austria, Belgium, Bulgaria, Czech Republic, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Russia, Spain, Sweden, Switzerland, United Kingdom), in the Near East, in the Nearctic realm, and in North Africa.
These flies mainly inhabit wooded areas, hedge rows, moist forests, wet meadows, parks and gardens. Chloromyia formosa can reach a length of 7.3–9 millimetres (0.29–0.35 in) and a wing length of 6–7 millimetres (0.24–0.28 in). Their body is elongated, the thorax is metallic green, the head is hemispherical without hair, while the eyes are quite hairy. Antennae are short, the first antennal segment is longer than the second. The legs are black, only the knees are yellow. The abdomen is flattened and broad.
An evident dimorphism exists between the males and the females of this species. In females the abdomen is blue-green with a purple sheen (depending on the light), while in males it shows a copper-green sheen... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 3 | Pyrénées National Park | 🇫🇷 France | |
| 4 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 5 | Wadden Sea National Park | 🇩🇪 Germany |
With luck
About 10% of wildlife watchers report a Broad Centurion Fly sighting in Brussels on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 154th most-seen of the 337 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.
May to July
In those months about 10% of wildlife watchers report a Broad Centurion Fly in Brussels on a given day, against under 5% in August to April, the lowest months.
Between 5 and 8 pm
Across all the parks we cover, that three-hour window holds the most Broad Centurion Fly sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
24th of 38
Of the 38 cities where we can rate Broad Centurion Fly sightings, Brussels ranks 24th at about 10%. The best odds are in Turin (Italy, about 20%), Liverpool (United Kingdom, about 20%) and London (United Kingdom, about 10%).
Same family: Stratiomyidae
The closest relatives of the Broad Centurion Fly that you can see in Brussels (family Stratiomyidae, Soldier Flies) are Twin-Spot Centurion Fly (about 10%) and Black-Horned Gem Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Broad Centurion Fly is recorded against all the insects logged in Brussels (12 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.
