Chalcosyrphus nemorum
In 3 days ~10% in a week ~20%
Chalcosyrphus (Xylotomima) nemorum (Fabricius 1805), the Dusky-banded Leafwalker, is a common species of syrphid fly with a Palearctic and Nearctic distribution. Hoverflies get their names from the ability to remain nearly motionless while in flight. The adults are also known as flower flies for they are commonly found around and on flowers, from which they get both energy-giving nectar and protein-rich pollen. Larvae have been found under the bark of Larix, Pinus and a variety of hardwoods.
External images For terms see Morphology of Diptera Wing length 6.5-8.25 mm. Hind femora are swollen and deep. Hind tibiae strongly curved and the ventral surface with closely-set short black hairs for the whole length. The abdomen is short tergites 2-4 with a pair of pink or orange-brown marks. The legs are black with yellow knees and yellow tarsi.
The larva is figured by Hartley (1961). Fennoscandia South to the Pyrenees and from Ireland East through Northern, Central and Southern Europe (to South Italy) across the Palearctic into Russia and the Russian Far East and Sakhalin and Japan. In the Nearctic from Alaska to Nova Scotia and South to California.... Wikipedia →
| # | Park | Country | Daily sighting probability |
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Rare
Under 5% of wildlife watchers report a Dusky-Banded Leafwalker sighting in Essen on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 347th most-seen of the 434 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 and July
In those months about 10% of wildlife watchers report a Dusky-Banded Leafwalker in Essen on a given day, against under 5% in August to May, the lowest months.
Yes
Of the 4 cities where we can rate Dusky-Banded Leafwalker sightings, Essen has the highest daily chance: under 5%. Next come London (United Kingdom, under 5%) and Toronto (Canada, under 5%).
Same family: Syrphidae
The closest relatives of the Dusky-Banded Leafwalker that you can see in Essen (family Syrphidae, Hover Flies) are Marmalade Hover Fly (about 20%), Common Drone Fly (about 10%) and Yellow-Haired Sun Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Dusky-Banded Leafwalker is recorded against all the insects logged in Essen (7 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.
