Gastrophysa cyanea
In 3 days ~10% in a week ~20%
Gastrophysa cyanea, the green dock beetle (note: Gastrophysa viridula in Europe is also sometimes called the green dock beetle), is a species of leaf beetle in the family Chrysomelidae. It is found in North America. G. cyanea is 4-5 mm and metallic green. Females can be distinguished by their swollen abdomens prior to egg laying. They emerge in spring and commonly feed on curly dock. Some pinned specimens will turn metallic blue. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sacramento | 🇺🇸 United States | |
| 2 | Salt Lake City | 🇺🇸 United States | |
| 3 | Denver | 🇺🇸 United States | |
| 4 | San Francisco | 🇺🇸 United States | |
| 5 | Los Angeles | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Blue Dock Beetle sighting in Denver on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 274th most-seen of the 461 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.
April and May
In those months about 10% of wildlife watchers report a Blue Dock Beetle in Denver on a given day, against under 5% in June to March, the lowest months. Those are among Denver's wettest months, with about 55 mm of rain a month against 15 mm in January.
Among the best
Of the 5 cities where we can rate Blue Dock Beetle sightings, Denver ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Sacramento (United States, under 5%) and Salt Lake City (United States, under 5%).
Same family: Chrysomelidae
The closest relatives of the Blue Dock Beetle that you can see in Denver (family Chrysomelidae, Leaf Beetles) are Elm Leaf Beetle (about 10%), Spotted Cucumber Beetle (about 10%) and Rabbitbrush Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Blue Dock Beetle is recorded against all the insects logged in Denver (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.
