Trichocera annulata
In 3 days ~10% in a week ~30%
Trichocera annulata, commonly known as the winter gnat, is a species of winter crane fly, of the order Diptera. First described by German entomologist Johann Wilhelm Meigen in 1818, it is found in Europe and North America. In North America, it is known from Alaska south to California and in Newfoundland. It is an introduced species in New Zealand. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States | |
| 2 | Paris | 🇫🇷 France | |
| 3 | Seattle | 🇺🇸 United States | |
| 4 | Washington | 🇺🇸 United States | |
| 5 | Melbourne | 🇦🇺 Australia | |
| 6 | New York City | 🇺🇸 United States | |
| 7 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Winter Gnat sighting in Portland on a given day, based on 24 verified sightings from GBIF citizen-science data. It is the 204th most-seen of the 507 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.
October to February
In those months about 10% of wildlife watchers report a Winter Gnat in Portland on a given day, against under 5% in March to September, the lowest months. Those are among Portland's wettest months, with about 190 mm of rain a month against 10 mm in July.
Yes
Of the 7 cities where we can rate Winter Gnat sightings, Portland has the highest daily chance: under 5%. Next come Paris (France, under 5%) and Seattle (United States, under 5%).
Same order: Diptera
The closest relatives of the Winter Gnat that you can see in Portland (order Diptera, Flies) are Yellow-Haired Sun Fly (about 10%), Black Soldier Fly (about 10%) and Narcissus Bulb Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Winter Gnat is recorded against all the insects logged in Portland (24 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.
