Promachus yesonicus
In 3 days ~40% in a week ~70%
Promachus yesonicus, or shioya-abu (塩屋虻, シオヤアブ) in Japanese, is a species of robber flies. In Japanese, "shioya" means a salt merchant (someone who makes or deals in salt), and "abu" means a horse-fly. This insect is called "shioya-abu" because the males have a white tip to their tail that resembles salt. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Promachus yesonicus sighting in Nagoya on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 96th most-seen of the 195 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
July
In that month about 40% of wildlife watchers report a Promachus yesonicus in Nagoya on a given day, against under 5% in June and August–April, the lowest months. That is one of Nagoya's wettest months, with about 230 mm of rain against 75 mm in January.
4th of 7
Of the 7 cities where we can rate Promachus yesonicus sightings, Nagoya ranks 4th at about 10%. The best odds are in Daejeon (South Korea, about 20%), Hiroshima (Japan, about 20%) and Osaka (Japan, about 20%).
Same order: Diptera
The closest relatives of the Promachus yesonicus that you can see in Nagoya (order Diptera, Flies) are Marmalade Hover Fly (about 10%), Helophilus eristaloideus (about 10%) and Phytomia zonata (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Promachus yesonicus is recorded against all the insects logged in Nagoya (12 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.
