Spilomyia interrupta
In 3 days ~10%
Spilomyia intertupta, the interrupted hornet fly, is an uncommon species of syrphid fly first officially described by Williston, 1882. This species is found in western North America. 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. The larvae are known as the short-tailed larva, suited for moist areas such as rot holes of trees. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an Interrupted Hornet Fly sighting in San Francisco on a given day, based on 14 verified sightings from GBIF citizen-science data. It is the 430th most-seen of the 737 insects we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report an Interrupted Hornet Fly in San Francisco on a given day, so our monthly data shows no clear season.
Only San Francisco, in our data
San Francisco is the only city on Wallace's Line with enough records to rate Interrupted Hornet Fly sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Syrphidae
The closest relatives of the Interrupted Hornet Fly that you can see in San Francisco (family Syrphidae, Hover Flies) are Oblique Streaktail (about 10%), Eurasian Drone Fly (about 10%) and Thick-Legged Hover Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Interrupted Hornet Fly is recorded against all the insects logged in San Francisco (14 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.
