Ectophasia crassipennis
In 3 days ~10% in a week ~20%
Ectophasia crassipennis is a species of parasitic fly in the subfamily Phasiinae of the family Tachinidae. Adults of Ectophasia crassipennis can reach a length of about 5–9 millimetres (0.20–0.35 in) and exhibit considerable variability in coloration, ranging from blackish to orange-brownish hues. Their large compound eyes are reddish. Notably, the species boasts a broad, flattened abdomen with ventrally folded sternite 7, while its large wings have wide brownish or greyish dots and the cell R5 is opened at the edge. Distinguishing Ectophasia crassipennis from its similar counterpart, Ectophasia oblonga, can pose a challenge due to their morphological similarities.
This fly is present in Southern Europe and warmer parts of Central Europe, where it thrives in diverse habitats. It also occurs in Asia in Russia, Japan, and China. These flies can mostly be encountered from early August through late September feeding on nectar of flowers (especially of Apiaceae and Asteraceae species).
The larvae are parasitic of Hemiptera (Pentatomidae, Acanthosomatidae, Coreidae and Lygaeidae species). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Pyrénées National Park | 🇫🇷 France | |
| 3 | Bavarian Forest National Park | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report an Ectophasia crassipennis sighting in London on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 1005th most-seen of the 1504 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report an Ectophasia crassipennis in London on a given day, so our monthly data shows no clear season.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Ectophasia crassipennis sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 9 cities where we can rate Ectophasia crassipennis sightings, London ranks 8th at under 5%, level with the leaders once rounded. The best odds are in Brussels (Belgium, under 5%), Warsaw (Poland, under 5%) and Munich (Germany, under 5%).
Same family: Tachinidae
The closest relatives of the Ectophasia crassipennis that you can see in London (family Tachinidae, Tachinid Flies) are Red Spotted Parasite Fly (about 10%), Common Tachinid (about 10%) and Phania funesta (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Ectophasia crassipennis is recorded against all the insects logged in London (11 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.
