Clostera albosigma
In 3 days ~10% in a week ~30%
Clostera albosigma, the sigmoid prominent, is a moth of the family Notodontidae. The species was first described by Asa Fitch in 1856. It is found in North America from Newfoundland west to Vancouver Island, north to the Great Slave Lake and the Northwest Territories and south to at least Missouri.
The wingspan is 28–38 mm. The moth flies from May to August depending on the location. The larvae feed on poplar and willow. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Elk Island National Park | 🇨🇦 Canada | |
| 2 | Acadia National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Edmonton | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Sigmoid Prominent sighting in Acadia National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 347th most-seen of the 405 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
In that month about 10% of wildlife watchers report a Sigmoid Prominent in Acadia National Park on a given day, against under 5% in July to May, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Sigmoid Prominent sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
2nd of 2
Of the 2 parks where we can rate Sigmoid Prominent sightings, Acadia National Park ranks 2nd at under 5%. The best odds are in Elk Island National Park (Canada, about 20%).
Same family: Notodontidae
The closest relatives of the Sigmoid Prominent that you can see in Acadia National Park (family Notodontidae, Prominent Moths) are Angulose Prominent (about 10%), White-Dotted Prominent (about 10%) and Chocolate Prominent (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sigmoid Prominent is recorded against all the insects logged in Acadia National Park (6 verified sightings from 2019 to 2026), 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.
