Stimulopalpus japonicus
In 3 days ~10% in a week ~20%
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 Tokyo on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 817th most-seen of the 1013 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 Japanese Barklouse in Tokyo on a given day, so our monthly data shows no clear season.
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.
Among the best
Of the 3 cities where we can rate Japanese Barklouse sightings, Tokyo ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Washington (United States, under 5%) and New York City (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Japanese Barklouse is recorded against all the insects logged in Tokyo (7 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.
