Isochaetes beutenmuelleri
In 3 days ~10% in a week ~20%
Isochaetes beutenmuelleri, the spun glass slug moth, is a moth of the family Limacodidae. It is found in the United States from New York to Florida and west to Colorado and Texas. Their wingspan is 19–24 mm. Adults are on wing from June to August.
The larvae feed on oak and beech. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Baltimore | 🇺🇸 United States | |
| 2 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Spun Glass Slug Moth sighting in Great Smoky Mountains National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 628th most-seen of the 822 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.
July and August
In those months about 10% of wildlife watchers report a Spun Glass Slug Moth in Great Smoky Mountains National Park on a given day, against under 5% in September to June, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Spun Glass Slug Moth 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.
Only Great Smoky Mountains National Park, in our data
Great Smoky Mountains National Park is the only park on Wallace's Line with enough records to rate Spun Glass Slug Moth sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Limacodidae
The closest relatives of the Spun Glass Slug Moth that you can see in Great Smoky Mountains National Park (family Limacodidae, Slug Caterpillar Moths) are Yellow-Shouldered Slug Moth (about 10%), Spiny Oak-Slug Moth (about 10%) and Saddleback Caterpillar Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Spun Glass Slug Moth is recorded against all the insects logged in Great Smoky Mountains National Park (5 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.
