Chrysomela vigintipunctata
In 3 days ~30% in a week ~50%
Chrysomela vigintipunctata, or the spotted willow leaf beetle, is a species of broad-shouldered leaf beetle belonging to the family Chrysomelidae, subfamily Chrysomelinae. The length of the beetles varies from 6.5 to 9.2 mm. Both larvae and adults feed on the leaves of its host plants, especially Salicaceae species. Elytra usually are yellowish-green, with ten black spots on each side, while the head and the pronotum are black, with yellow sides.
Beetles live mostly in forests, along lakes, swamps and feed on willow and Populus. They are found in most of Europe, Mongolia, Russian Far East and Japan. A single dead specimen was found, for the first time in Britain, at Southwold beach, east Suffolk on 26 May 2016. A search in suitable habitat for more specimens was unsuccessful. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Taroko National Park | 🇹🇼 Taiwan |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Spotted Willow Leaf Beetle sighting in Brussels on a given day, based on 42 verified sightings from GBIF citizen-science data. It is the 66th most-seen of the 337 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
April and June
In those months about 20% of wildlife watchers report a Spotted Willow Leaf Beetle in Brussels on a given day, against under 5% in July to February, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Spotted Willow Leaf Beetle sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 8 cities where we can rate Spotted Willow Leaf Beetle sightings, Brussels ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Essen (Germany, about 10%).
Same family: Chrysomelidae
The closest relatives of the Spotted Willow Leaf Beetle that you can see in Brussels (family Chrysomelidae, Leaf Beetles) are Rosemary Beetle (about 10%), Alder Leaf Beetle (about 10%) and Jewel Reed Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Spotted Willow Leaf Beetle is recorded against all the insects logged in Brussels (42 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.
