Cheilosia pagana
In 3 days ~10% in a week ~30%
Cheilosia pagana is a Holarctic species of hoverfly. Like most Cheilosia it is black, and because of this may often be overlooked as a hoverfly. One identifying feature is a large red to orange 3rd antennal segment. For terms see Morphology of Diptera
Wing length 4.75-8·5 mm. Antennae with third segment clear orange and very large:no furrow. Frons flat in male. Thoracic pubescence variable. Female scutellum entirely black. Legs part yellow. Tarsi 1 with pale central segments pale. Part of the pagana species group.
Present in most of Europe and in the eastern Palearctic realm. East to Siberia. Nearctic Habitat: coniferous and deciduous woodland, unimproved grassland, along hedgerows in farmland and at roadsides. Scrub and carr. Flowers visited include yellow composites, Ranunculaceae, white umbellifers, Allium ursinum, Anemone nemorosa, Fragaria, Potentilla erecta, Primula, Prunus spinosa and Salix.
Flight period is from May to September. In southern Europe, on the wing from mid March. Larvae are known to inhabit semi-liquid, decaying tissue of the roots of plants. There is a rearing record from decaying roots of Cow Parsley.
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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 | London | 🇬🇧 United Kingdom |
Rare
Under 5% of wildlife watchers report a Parsley Blacklet sighting in London on a given day, based on 30 verified sightings from GBIF citizen-science data. It is the 660th 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 30%, if each day is a fresh chance.
April and July
In those months about 10% of wildlife watchers report a Parsley Blacklet in London on a given day, against under 5% in May–June and August–March, the lowest months.
3rd of 3
Of the 3 cities where we can rate Parsley Blacklet sightings, London ranks 3rd at under 5%. The best odds are in Birmingham (United Kingdom, about 10%) and Liverpool (United Kingdom, about 10%).
GBIF citizen-science records
It is estimated from how often the Parsley Blacklet is recorded against all the insects logged in London (30 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.
