Galerucella nymphaeae
In 3 days ~10% in a week ~20%
Galerucella nymphaeae, known generally as the water-lily beetle or water lily leaf beetle, is a species of skeletonizing leaf beetle in the family Chrysomelidae. It is found in North America and Europe. A 6–8 mm (0.24–0.31 in) elongated oval yellow-brown sleek-haired beetle with mottles on the wingtops. The feet and feelers are darker. The adults can over winter on shore and in typical central European environments have two generations a year, with the initial one closer to shore. In thermal lakes this can be increased to four generations a year with a single female producing in its lifetime 80 to 120 eggs.
The orange-yellow pupa adhere to the surface of the water lily leaf for about a week. This stage lasts 5 to 10 days and they slough three times. Young larvae are black-green, and become initially light brown and once they reach 6–8 mm (0.24–0.31 in) with three foot-pairs have a chestnut-brown head capsule.
Found as spherical reticulated opal-white bunches of 10 to 15 on stems and lily parts that emerge from the water surface. They are destructive to the ornamental appearance of water lilies with both adults... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Munich | 🇩🇪 Germany | |
| 2 | Orlando | 🇺🇸 United States | |
| 3 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Waterlily Leaf Beetle sighting in Orlando on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 266th most-seen of the 294 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.
March
In that month about 10% of wildlife watchers report a Waterlily Leaf Beetle in Orlando on a given day, against under 5% in April to February, the lowest months.
Among the best
Of the 3 cities where we can rate Waterlily Leaf Beetle sightings, Orlando ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Munich (Germany, under 5%).
GBIF citizen-science records
It is estimated from how often the Waterlily Leaf Beetle is recorded against all the insects logged in Orlando (10 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.
