Cerodontha dorsalis
In 3 days ~10% in a week ~20%
Cerodontha dorsalis, the grass sheathminer, is a species of fly in the family Agromyzidae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Grass Sheathminer Fly sighting in New York City on a given day, based on 20 verified sightings from GBIF citizen-science data. It is the 710th most-seen of the 1623 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Grass Sheathminer Fly in New York City on a given day, so our monthly data shows no clear season.
Only New York City, in our data
New York City is the only city on Wallace's Line with enough records to rate Grass Sheathminer Fly sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Grass Sheathminer Fly is recorded against all the insects logged in New York City (20 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.
