Melangyna viridiceps
In 3 days ~10% in a week ~30%
Melangyna viridiceps is an Australian hoverfly, known as the common hover fly. It is one of the two most common hoverflies in Australia, alongside Simosyrphus grandicornis, with which it has often been confused, but can be distinguished by its all black thorax.
M. viridiceps has a body up to 1 cm in length. The adult flies feed on pollen and nectar which they gather from flowers, while the larvae feed on aphids. It is found widely across Eastern Australia. Some sources indicate that the species is also present in New Zealand, either on the Kermadec Islands only, or on both the Kermadecs and the mainland. Most recent sources, however, do not record this species as being present outside of Australia. Miller's 1921 mention for the Kermadec was found to be a misidentification for Simosyrphus grandicornis, and Macfarlane et al. failed to cite specimens or published reports for their claim of the species' presence in the Kermadec.
Data related to Melangyna viridiceps at Wikispecies Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Grampians National Park | 🇦🇺 Australia | |
| 2 | Hattah-Kulkyne National Park | 🇦🇺 Australia | |
| 3 | Great Otway National Park | 🇦🇺 Australia | |
| 4 | Blue Mountains National Park | 🇦🇺 Australia |
Rare
Under 5% of wildlife watchers report a Common Halfband sighting in Sydney on a given day, based on 48 verified sightings from GBIF citizen-science data. It is the 186th most-seen of the 742 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.
June to October
In those months about 10% of wildlife watchers report a Common Halfband in Sydney on a given day, against under 5% in November to May, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Common Halfband sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 5
Of the 5 cities where we can rate Common Halfband sightings, Sydney ranks 4th at under 5%. The best odds are in Melbourne (Australia, about 20%), Hobart (Australia, about 10%) and Perth (Australia, about 10%).
GBIF citizen-science records
It is estimated from how often the Common Halfband is recorded against all the insects logged in Sydney (48 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.
