Olla v-nigrum
In 3 days ~20% in a week ~50%
Olla v-nigrum is a species in the family Coccinellidae ("lady beetles"), in the suborder Polyphaga. The species is known generally as the ashy gray lady beetle. The distribution range of Olla v-nigrum includes Central America, North America, and Oceania. It is usually gray or pale tan with small black spots on its elytra and thorax. However, a variation can resemble Chilocorus orbus, another species of lady beetle. This form is black with two red spots on the wing covers and has white on the edge of the prothorax.
The V in its name (v-nigrum) comes from the fact that Mulsant originally described the "prothorax" (pronotum) as "adorned with a V and four black dots". Olla v-nigrum has two color variants: gray with black spots or black with red spots. They are usually anywhere between 3.7 to 6.1 mm (0.15 to 0.24 in) in length. Olla v-nigrum is often confused with Chilocorus sp. which usually have more flared elytra and a distinct shape. They do not have white marking on their heads like Olla v-nigrum. Olla v-nigrum spots tend to be triangular and slope away from where the wings meet.
Olla v-nigrum lack an infundibulum in female genitalia. Olla v... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Big Bend National Park | 🇺🇸 United States | |
| 2 | Cumbres de Monterrey National Park | 🇲🇽 Mexico | |
| 3 | Tijuca National Park | 🇧🇷 Brazil | |
| 4 | Saguaro National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mendoza | 🇦🇷 Argentina | |
| 2 | Monterrey | 🇲🇽 México | |
| 3 | Mesa | 🇺🇸 United States | |
| 4 | Austin | 🇺🇸 United States | |
| 5 | Buenos Aires | 🇦🇷 Argentina | |
| 6 | Montevideo | 🇺🇾 Uruguay | |
| 7 | São Paulo | 🇧🇷 Brazil | |
| 8 | San Antonio | 🇺🇸 United States | |
| 9 | Belo Horizonte | 🇧🇷 Brazil | |
| 10 | Rio de Janeiro | 🇧🇷 Brazil |
With luck
About 10% of wildlife watchers report an Ashy Gray Lady Beetle sighting in Las Vegas on a given day, based on 21 verified sightings from GBIF citizen-science data. It is the 40th most-seen of the 111 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.
May
In that month about 20% of wildlife watchers report an Ashy Gray Lady Beetle in Las Vegas on a given day, against under 5% in January–February, July–September and November, the lowest months. That is one of Las Vegas's driest months, with almost no rain against 25 mm in February.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Ashy Gray Lady Beetle 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.
13th of 33
Of the 33 cities where we can rate Ashy Gray Lady Beetle sightings, Las Vegas ranks 13th at about 10%. The best odds are in Mendoza (Argentina, about 20%), Monterrey (México, about 10%) and Mesa (United States, about 10%).
Same family: Coccinellidae
The closest relatives of the Ashy Gray Lady Beetle that you can see in Las Vegas (family Coccinellidae, Lady Beetles) are Seven-Spotted Lady Beetle (about 10%) and Convergent Lady Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Ashy Gray Lady Beetle is recorded against all the insects logged in Las Vegas (21 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.
