Dasysyrphus tricinctus
In 3 days ~10% in a week ~30%
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 |
With luck
About 10% of wildlife watchers report a Yellow-Girdled Brusheye sighting in Helsinki on a given day, based on 17 verified sightings from GBIF citizen-science data. It is the 325th most-seen of the 838 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.
August and September
In those months about 10% of wildlife watchers report a Yellow-Girdled Brusheye in Helsinki on a given day, against under 5% in October to July, the lowest months.
Yes
Of the 8 cities where we can rate Yellow-Girdled Brusheye sightings, Helsinki has the highest daily chance: about 10%. Next come Birmingham (United Kingdom, under 5%) and Nizhny Novgorod (Russia, under 5%).
Same family: Syrphidae
The closest relatives of the Yellow-Girdled Brusheye that you can see in Helsinki (family Syrphidae, Hover Flies) are Marmalade Hover Fly (about 20%), Sun Fly (about 20%) and Pellucid Hover Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Yellow-Girdled Brusheye is recorded against all the insects logged in Helsinki (17 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.
