Xylota sylvarum
In 3 days ~10% in a week ~20%
Xylota sylvarum is a common Palearctic species of hoverfly. Wing length 9–12 mm. Thorax blackish. Four anterior legs partly yellow. Abdomen black with golden patches (adpressed golden hair). The male genitalia are figured by Hippa (1968). The larva is illustrated in colour by Rotheray (1994) ).
See references for determination. Palearctic Fennoscandia South to Iberia. Ireland eastwards through North Europe on to Siberia and the Pacific coast. Old woodland species running on the foliage of bushes and shrubs and on tree stumps. The larvae feed in damp, fungus-ridden decaying wood of Abies, Fagus and Quercus trunks and stumps, usually beneath the bark. The major habitat may be decaying tree roots...
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| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Birmingham | 🇬🇧 United Kingdom | |
| 2 | Liverpool | 🇬🇧 United Kingdom | |
| 3 | Essen | 🇩🇪 Germany | |
| 4 | Copenhagen | 🇩🇰 Denmark | |
| 5 | Hamburg | 🇩🇪 Germany | |
| 6 | Helsinki | 🇫🇮 Finland | |
| 7 | Warsaw | 🇵🇱 Poland | |
| 8 | London | 🇬🇧 United Kingdom | |
| 9 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Golden-Tailed Leafwalker sighting in London on a given day, based on 21 verified sightings from GBIF citizen-science data. It is the 738th 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.
June
In that month about 10% of wildlife watchers report a Golden-Tailed Leafwalker in London on a given day, against under 5% in July to May, the lowest months.
8th of 9
Of the 9 cities where we can rate Golden-Tailed Leafwalker sightings, London ranks 8th at under 5%. The best odds are in Birmingham (United Kingdom, about 10%), Liverpool (United Kingdom, about 10%) and Essen (Germany, under 5%).
GBIF citizen-science records
It is estimated from how often the Golden-Tailed Leafwalker is recorded against all the insects logged in London (21 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.
