Galeruca tanaceti
In 3 days ~10% in a week ~30%
Galeruca tanaceti is a species of leaf beetle found in the Palearctic realm, and is the type species of the genus Galeruca. It feeds on various plants in both its adult and larval stages. The species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae.
This species is present in the Palearctic realm from Portugal to Japan. It is also present in the Near East and North Africa. It has been introduced to northern America. These beetles inhabit dry and sunny areas, meadows and grassy places.
Galeruca tanaceti can reach a length of 6–11 millimetres (0.24–0.43 in). These leaf beetles have a broadly ovate, convex and glabrous body. The head, pronotum and elytra are matt black and densely punctured. The lateral margins of the elytra are explanate. The legs are entirely black, relatively long and slender.
The females are longer than the males. At the time of oviposition the abdomen is greatly enlarged and filled with eggs so much that the elytra cover just one half of the length of the belly. The larvae are dark and covered with bristles on fleshy outgrowths.
Adults can be found between June and August... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mercantour National Park | 🇫🇷 France | |
| 2 | Białowieża National Park | 🇵🇱 Poland | |
| 3 | Tatra National Park | 🇸🇰 Slovakia | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 5 | Pyrénées National Park | 🇫🇷 France | |
| 6 | Cévennes National Park | 🇫🇷 France |
Rare
Under 5% of wildlife watchers report a Black-Punctured Leaf Beetle sighting in Helsinki on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 413th 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 30%, if each day is a fresh chance.
September
In that month about 10% of wildlife watchers report a Black-Punctured Leaf Beetle in Helsinki on a given day, against under 5% in October to August, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Black-Punctured Leaf Beetle sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
8th of 13
Of the 13 cities where we can rate Black-Punctured Leaf Beetle sightings, Helsinki ranks 8th at under 5%. The best odds are in Kyiv (Ukraine, about 10%), Kharkiv (Ukraine, about 10%) and Prague (Czechia, about 10%).
Same family: Chrysomelidae
The closest relatives of the Black-Punctured Leaf Beetle that you can see in Helsinki (family Chrysomelidae, Leaf Beetles) are Alder Leaf Beetle (about 20%), Western Grape Rootworm (about 10%) and Chrysolina sanguinolenta (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black-Punctured Leaf Beetle is recorded against all the insects logged in Helsinki (12 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.
