Cylindromyia bicolor
In 3 days ~10% in a week ~20%
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 Porto on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 457th most-seen of the 498 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.
May and July
In those months about 10% of wildlife watchers report a Cylindromyia bicolor in Porto on a given day, against under 5% in June and August–April, the lowest months. Those are among Porto's driest months, with about 35 mm of rain a month against 140 mm in January.
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.
10th of 11
Of the 11 cities where we can rate Cylindromyia bicolor sightings, Porto ranks 10th at under 5%. The best odds are in Warsaw (Poland, about 10%), Budapest (Hungary, about 10%) and Lyon (France, about 10%).
Same order: Diptera
The closest relatives of the Cylindromyia bicolor that you can see in Porto (order Diptera, Flies) are Marmalade Hover Fly (about 10%), Stripe-Eyed Lagoon Fly (about 10%) and Common Drone Fly (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 Porto (5 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.
