Stimulopalpus japonicus
In 3 days ~10% in a week ~30%
The Japanese barklouse (Stimulopalpus japonicus) is a species of tropical barklouse in the family Amphientomidae, described by German biologist Günther Enderlein in 1906. Males are unknown, suggesting females might reproduce by thelytoky. It is native to Japan, but also found elsewhere in East Asia, and in South Asia. It was inadvertently introduced to the United States (in the 1940s) and to Italy. They are often found congregating on rocks and concrete. 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 | Washington | 🇺🇸 United States | |
| 2 | New York City | 🇺🇸 United States | |
| 3 | Tokyo | 🇯🇵 Japan |
Rare
Under 5% of wildlife watchers report a Japanese Barklouse sighting in Great Smoky Mountains National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 513th 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 30%, if each day is a fresh chance.
June to August
In those months about 10% of wildlife watchers report a Japanese Barklouse in Great Smoky Mountains National Park on a given day, against under 5% in September to May, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Japanese Barklouse sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
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 Japanese Barklouse sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Japanese Barklouse is recorded against all the insects logged in Great Smoky Mountains National Park (9 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.
