Psyllobora vigintimaculata
In 3 days ~10% in a week ~20%
Psyllobora vigintimaculata, the twenty-spotted lady beetle, is a species of lady beetle in the family Coccinellidae. It is found in North America, where it has been recorded from Newfoundland to Alaska in the north and from Virginia to Tennessee and Louisiana, west to southern California.
P. vigintimaculata is about 1.75–3.0 mm in length, lives 1-2 years, and has four or five distinctive dark spots on the pronotum in an "M" shape. The elytra have dark, orange or bicolored spots on a white background. Although it is sometimes confused with the fourteen-spotted lady beetle (Propylea quatuordecimpunctata) and the Asian lady beetle (Harmonia axyridis), its unique pattern helps to distinguish it from other lady beetle species found in North America.
In a laboratory setting, the subspecies P. vigintimaculata taedata undergoes four larval instars, molting and then pupation. The timing of life cycle varies according to rearing conditions. The first instar larvae has a white oval body with small hairs projecting from the thorax. The larvae of the second instar have a stripe and a much darker color that gradually turns lighter with... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States | |
| 3 | Channel Islands National Park | 🇺🇸 United States | |
| 4 | Olympic National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States | |
| 2 | Vancouver | 🇨🇦 Canada | |
| 3 | Boston | 🇺🇸 United States | |
| 4 | Zhuhai [Macau] | 🇨🇳 China | |
| 5 | Seattle | 🇺🇸 United States | |
| 6 | San Francisco | 🇺🇸 United States | |
| 7 | Toronto | 🇨🇦 Canada | |
| 8 | Edmonton | 🇨🇦 Canada | |
| 9 | Montreal | 🇨🇦 Canada | |
| 10 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Twenty-Spotted Lady Beetle sighting in Sacramento on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 209th most-seen of the 386 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 to August
In those months about 10% of wildlife watchers report a Twenty-Spotted Lady Beetle in Sacramento on a given day, against under 5% in September to May, the lowest months. Those are among Sacramento's driest months, with almost no rain against 120 mm in December.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Twenty-Spotted Lady Beetle sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
21st of 28
Of the 28 cities where we can rate Twenty-Spotted Lady Beetle sightings, Sacramento ranks 21st at under 5%. The best odds are in Portland (United States, about 10%), Vancouver (Canada, about 10%) and Boston (United States, about 10%).
Same family: Coccinellidae
The closest relatives of the Twenty-Spotted Lady Beetle that you can see in Sacramento (family Coccinellidae, Lady Beetles) are Asian Lady Beetle (about 30%), Seven-Spotted Lady Beetle (about 20%) and Convergent Lady Beetle (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Twenty-Spotted Lady Beetle is recorded against all the insects logged in Sacramento (13 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.
