Dasysyrphus tricinctus
In 3 days ~10% in a week ~20%
Dasysyrphus tricinctus is a European species of hoverfly in the genus Dasysyrphus, a member of the family Syrphidae. It is found across Europe, although reported in highest density from the British Isles and Scandinavia. While not uncommon it is generally only seen in modest numbers, typically in lowland woods with peak numbers in late May and early June and again in late August and early September.
External images For terms see Morphology of Diptera Wing length 7·25-10·25 mm. Eyes hairy. Wing stigma black. Tergite 3 with yellow pattern much broader than on tergite 4 and yellow pattern on tergite 2 small or absent/ Male genitalia are figured by Hippa (1968).
The larva is illustrated by Rotheray (1993). Palaearctic. Iceland South to the Pyrenees and North Spain. Ireland and Fennoscandia eastwards through Central and North Europe and Russia to the Pacific coast and Japan. Habitat: deciduous forest, coniferous forest and conifer plantations, Picea plantations, scrub Betula, tracksides, clearings, parkland. Arboreal, but descends to visit flowers of yellow composites and white umbellifers Calluna, Campanula, Convolvulus, Cornus, Euphorbia... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland | |
| 2 | Birmingham | 🇬🇧 United Kingdom | |
| 3 | Nizhny Novgorod | 🇷🇺 Russia | |
| 4 | Copenhagen | 🇩🇰 Denmark | |
| 5 | London | 🇬🇧 United Kingdom | |
| 6 | Moscow | 🇷🇺 Russia | |
| 7 | Vienna | 🇦🇹 Austria | |
| 8 | Saint Petersburg | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Yellow-Girdled Brusheye sighting in Vienna on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 1090th most-seen of the 1406 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 a Yellow-Girdled Brusheye in Vienna on a given day, so our monthly data shows no clear season.
7th of 8
Of the 8 cities where we can rate Yellow-Girdled Brusheye sightings, Vienna ranks 7th at under 5%. The best odds are in Helsinki (Finland, about 10%), Birmingham (United Kingdom, under 5%) and Nizhny Novgorod (Russia, under 5%).
GBIF citizen-science records
It is estimated from how often the Yellow-Girdled Brusheye is recorded against all the insects logged in Vienna (8 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.
