Stenopterus ater
In 3 days ~10% in a week ~20%
Stenopterus ater is a species of longhorn beetle found across the Western Mediterranean region from North Africa to France and Italy. The larvae grow in dead wood and the adults visit Umbelliferae flowers in summer. They are about 6 to 14 mm long with males and females being differently coloured. The elytra are all black in females and yellowish brown in males. A case of gynandromorphism has been recorded in the species. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 2 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
Rare
Under 5% of wildlife watchers report a Stenopterus ater sighting in Madrid on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 328th most-seen of the 457 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.
June and July
In those months about 10% of wildlife watchers report a Stenopterus ater in Madrid on a given day, against under 5% in August to May, the lowest months. Those are among Madrid's driest months, with about 15 mm of rain a month against 65 mm in October.
Between 6 and 9 pm
Across all the parks we cover, that three-hour window holds the most Stenopterus ater sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
3rd of 3
Of the 3 cities where we can rate Stenopterus ater sightings, Madrid ranks 3rd at under 5%. The best odds are in Algiers (Algeria, about 10%) and Rome (Italy, about 10%).
Same family: Cerambycidae
The closest relatives of the Stenopterus ater that you can see in Madrid (family Cerambycidae, Longhorn Beetles) are Certallum ebulinum (about 10%), Fairy-Ring Longhorn Beetle (about 10%) and Calamobius filum (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Stenopterus ater is recorded against all the insects logged in Madrid (12 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.
