Psephenus herricki
In 3 days ~20% in a week ~50%
Psephenus herricki is a species of water penny beetle in the family Psephenidae. It is found in eastern North America. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Herrick's Water Penny Beetle sighting in Shenandoah National Park on a given day, based on 22 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 194th most-seen of the 723 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
April to November
In those months about 10% of wildlife watchers report a Herrick's Water Penny Beetle in Shenandoah National Park on a given day, against under 5% in December to March, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Herrick's Water Penny Beetle sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Herrick's Water Penny Beetle sightings, Shenandoah National Park has the highest daily chance: about 10%. Next come Great Smoky Mountains National Park (United States, about 10%).
Same order: Coleoptera
The closest relatives of the Herrick's Water Penny Beetle that you can see in Shenandoah National Park (order Coleoptera, Beetles) are Asian Lady Beetle (about 30%), Larger Elm Leaf Beetle (about 30%) and Seven-Spotted Lady Beetle (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Herrick's Water Penny Beetle is recorded against all the insects logged in Shenandoah National Park (22 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.
