Orthosoma brunneum
In 3 days ~20% in a week ~40%
Orthosoma is a genus of beetles in the family Cerambycidae. It is monotypic, being represented by the single species Orthosoma brunneum. The genus name Orthosoma was also previously used for a microsporidian genus. As the name is pre-occupied by this beetle genus, the name for the microsporidian has been changed to Orthosomella. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Baltimore | 🇺🇸 United States | |
| 2 | Washington | 🇺🇸 United States | |
| 3 | Philadelphia | 🇺🇸 United States | |
| 4 | New York City | 🇺🇸 United States | |
| 5 | Toronto | 🇨🇦 Canada | |
| 6 | Boston | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Brown Prionid sighting in Shenandoah National Park on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 301st 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 40%, if each day is a fresh chance.
July–August and October
In those months about 10% of wildlife watchers report a Brown Prionid in Shenandoah National Park on a given day, against under 5% in September and November–June, the lowest months.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Brown Prionid sightings with a recorded time, and about 8 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Among the best
Of the 2 parks where we can rate Brown Prionid sightings, Shenandoah National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Great Smoky Mountains National Park (United States, about 10%).
Same family: Cerambycidae
The closest relatives of the Brown Prionid that you can see in Shenandoah National Park (family Cerambycidae, Longhorn Beetles) are Locust Borer (about 20%), Red Milkweed Beetle (about 20%) and Strangalepta Flower Longhorn Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Brown Prionid is recorded against all the insects logged in Shenandoah National Park (12 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.
