Chrysolina hyperici
In 3 days ~10% in a week ~20%
Chrysolina hyperici, the lesser Saint John's wort beetle is a species of beetles of the family Chrysomelidae. The species lays up to 2,000 eggs on the host plant during the early fall. They lay their eggs on the undersides of leaves of new fall basal growth on its host plant, St. John's Wort (Hypericum perforatum), although it is also known to feed on other species of Hypericum. The larvae feed for a month on the leaves, emerging at night and hiding during the day. When full grown they move to the soil to pupate. After two weeks they emerge as adults. In the spring the adults feed upon new growth of their host plant.
The species is most often classified as Chrysolina hyperici (Forster, 1771), however it was originally placed in the genus Chrysomela as Chrysomela hyperici. It was first scientifically described and named by Johann Reinhold Forster in Novæ species insectorum in the year 1771. Within the genus Chrysolina, the species is classified in the subgenus Hypericia. It is closely related to the species Chrysolina quadrigemina.
Chrysolina hyperici is often known in English by the common names "St. Johnswort Beetle", "Saint John's... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States | |
| 2 | Seattle | 🇺🇸 United States | |
| 3 | Sacramento | 🇺🇸 United States | |
| 4 | Vancouver | 🇨🇦 Canada | |
| 5 | Birmingham | 🇬🇧 United Kingdom | |
| 6 | Helsinki | 🇫🇮 Finland | |
| 7 | Toronto | 🇨🇦 Canada | |
| 8 | Boston | 🇺🇸 United States | |
| 9 | Montreal | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Saint John's Wort Beetle sighting in Helsinki on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 732nd most-seen of the 838 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Saint John's Wort Beetle in Helsinki on a given day, so our monthly data shows no clear season.
6th of 9
Of the 9 cities where we can rate Saint John's Wort Beetle sightings, Helsinki ranks 6th at under 5%. The best odds are in Portland (United States, about 10%), Seattle (United States, under 5%) and Sacramento (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Saint John's Wort Beetle is recorded against all the insects logged in Helsinki (5 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.
