Lochmaea crataegi
In 3 days ~10% in a week ~20%
Lochmaea crataegi is a species of leaf beetle native to Europe. Locally distributed throughout England and Wales, less extensively so in southern Scotland. Adults are found on hawthorn (Crataegus) blossom, around Watford it seems exclusively so as beating the earlier flowering blackthorn (Prunus spinosa), among many other types of blossom, over the years has failed to produce the species. Depending on season Crataegus begins to flower during the third week of April when occasionally single Lochmaea are found, numbers increase until the first or second week of may when Crataegus blossom is everywhere and the adults can be beaten in numbers throughout our area. They are active throughout May and are often found alongside Neocoenorrhinus aequatus. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | London | 🇬🇧 United Kingdom | |
| 2 | Birmingham | 🇬🇧 United Kingdom | |
| 3 | Vienna | 🇦🇹 Austria |
Rare
Under 5% of wildlife watchers report a Hawthorn Leaf Beetle sighting in Vienna on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 1178th most-seen of the 1406 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
In that month about 10% of wildlife watchers report a Hawthorn Leaf Beetle in Vienna on a given day, against under 5% in May to March, the lowest months.
3rd of 3
Of the 3 cities where we can rate Hawthorn Leaf Beetle sightings, Vienna ranks 3rd at under 5%. The best odds are in London (United Kingdom, about 10%) and Birmingham (United Kingdom, about 10%).
Same family: Chrysomelidae
The closest relatives of the Hawthorn Leaf Beetle that you can see in Vienna (family Chrysomelidae, Leaf Beetles) are Colorado Potato Beetle (about 10%), Willow Clytra (about 10%) and Cassida nebulosa (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Hawthorn Leaf Beetle is recorded against all the insects logged in Vienna (6 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.
