Moneilema armatum
In 3 days ~20% in a week ~50%
Moneilema armatum is a species of flat-faced longhorn in the family of beetles known as Cerambycidae. It is found in the southwestern United States and northern Mexico. The flightless beetles often feed on prickly pear cactus, boring into the stems and roots. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Guadalupe Mountains National Park | 🇺🇸 United States | |
| 2 | Big Bend National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Black Cactus Longhorn Beetle sighting in Big Bend National Park on a given day, based on 15 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 115th most-seen of the 329 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.
July
In that month about 20% of wildlife watchers report a Black Cactus Longhorn Beetle in Big Bend National Park on a given day, against under 5% in August and December–March, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Black Cactus Longhorn Beetle 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.
Among the best
Of the 2 parks where we can rate Black Cactus Longhorn Beetle sightings, Big Bend National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Guadalupe Mountains National Park (United States, about 10%).
Same family: Cerambycidae
The closest relatives of the Black Cactus Longhorn Beetle that you can see in Big Bend National Park (family Cerambycidae, Longhorn Beetles) are Double-Banded Bycid (about 10%) and Mesquite Girdler (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black Cactus Longhorn Beetle is recorded against all the insects logged in Big Bend National Park (15 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.
