Gastrophysa cyanea
In 3 days ~10% in a week ~30%
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 Sacramento on a given day, based on 22 verified sightings from GBIF citizen-science data. It is the 162nd 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 30%, if each day is a fresh chance.
April
In that month about 10% of wildlife watchers report a Blue Dock Beetle in Sacramento on a given day, against under 5% in May to March, the lowest months.
Yes
Of the 5 cities where we can rate Blue Dock Beetle sightings, Sacramento has the highest daily chance: under 5%. Next come Salt Lake City (United States, under 5%) and Denver (United States, under 5%).
Same family: Chrysomelidae
The closest relatives of the Blue Dock Beetle that you can see in Sacramento (family Chrysomelidae, Leaf Beetles) are Elm Leaf Beetle (about 10%) and Spotted Cucumber 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 Sacramento (22 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.
