Cylindromyia bicolor
In 3 days ~10% in a week ~30%
Cylindromyia bicolor is a European species of fly in the family Tachinidae. Czech Republic, Hungary, Moldova, Romania, Slovakia, Ukraine, Bosnia and Herzegovina, Bulgaria, Corsica, Croatia, Greece, Italy, Macedonia, Portugal, Serbia, Slovenia, Spain, Turkey, Austria, Belgium, France, Germany, Netherlands, Switzerland, Kazakhstan, Iran, Russia, Transcaucasia.
These insects mainly inhabit dry meadows, bushes, edges of wood, marshes, parks and gardens. Cylindromyia bicolor can reach a length of 11–14 millimetres (0.43–0.55 in). These small flies have a grayish thorax and very elongated, cylindrical red abdomen, with a black longitudinal band at the base and discal bristles at the tergites 2–4. The large compound eyes are dark brown. Wings are partly smoked. Calyptra are large and white. Legs are black.
Adults can be found from mid July to October, with a peak in August. They feed on nectar and pollen of flowers of various local plants, but especially on Apiaceae. Larvae of this species are endoparasites of Rhaphigaster nebulosa (Pentatomidae). The females lay their eggs on their hosts, usually one egg per bug. Then the... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Bavarian Forest National Park | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report a Cylindromyia bicolor sighting in Bavarian Forest National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 964th most-seen of the 1115 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.
July and August
In those months about 10% of wildlife watchers report a Cylindromyia bicolor in Bavarian Forest National Park on a given day, against under 5% in September to June, the lowest months.
Between 3 and 6 pm
Across all the parks we cover, that three-hour window holds the most Cylindromyia bicolor sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 parks where we can rate Cylindromyia bicolor sightings, Bavarian Forest National Park ranks 2nd at under 5%. The best odds are in Cévennes National Park (France, about 10%).
Same family: Tachinidae
The closest relatives of the Cylindromyia bicolor that you can see in Bavarian Forest National Park (family Tachinidae, Tachinid Flies) are Red Spotted Parasite Fly (about 10%) and Phasia hemiptera (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Cylindromyia bicolor is recorded against all the insects logged in Bavarian Forest 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.
