Leptura quadrifasciata
In 3 days ~10% in a week ~20%
Leptura quadrifasciata, the four-banded longhorn beetle, is a species of beetle in the family Cerambycidae. It was described by Carl Linnaeus in his landmark 1758 10th edition of Systema Naturae. Adult beetles are 11–20 mm long, black with four more or less continuous transverse yellow bands. In extreme cases the elytra may be almost entirely black. It is found throughout the northern and central Palearctic realm. The species is distributed in northern and central regions of Europe and Asia. It is particularly common in Scandinavia, Finland and Great Britain and is typically seen during the summer months. Larvae make meandering galleries in various trees, including oak, beech, birch, willow, alder, elder and spruce; typically in dead and decaying trees, with a preference for damp areas. The life cycle lasts two to three years. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Białowieża National Park | 🇵🇱 Poland | |
| 2 | Biebrza National Park | 🇵🇱 Poland | |
| 3 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 4 | Tatra National Park | 🇸🇰 Slovakia | |
| 5 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 6 | Ecrins National Park | 🇫🇷 France | |
| 7 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 8 | Pyrénées National Park | 🇫🇷 France | |
| 9 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland | |
| 2 | Warsaw | 🇵🇱 Poland | |
| 3 | Amsterdam | 🇳🇱 Netherlands | |
| 4 | Hamburg | 🇩🇪 Germany | |
| 5 | Novosibirsk | 🇷🇺 Russia | |
| 6 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 7 | Essen | 🇩🇪 Germany | |
| 8 | Berlin | 🇩🇪 Germany | |
| 9 | Copenhagen | 🇩🇰 Denmark | |
| 10 | Minsk | 🇧🇾 Belarus |
Rare
Under 5% of wildlife watchers report a Four-Banded Longhorn Beetle sighting in Saint Petersburg on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 209th most-seen of the 448 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.
July
In that month about 10% of wildlife watchers report a Four-Banded Longhorn Beetle in Saint Petersburg on a given day, against under 5% in August to June, the lowest months. That is one of Saint Petersburg's wettest months, with about 100 mm of rain against 40 mm in February.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Four-Banded Longhorn Beetle sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
19th of 19
Of the 19 cities where we can rate Four-Banded Longhorn Beetle sightings, Saint Petersburg ranks 19th at under 5%. The best odds are in Helsinki (Finland, about 10%), Warsaw (Poland, about 10%) and Amsterdam (Netherlands, about 10%).
GBIF citizen-science records
It is estimated from how often the Four-Banded Longhorn Beetle is recorded against all the insects logged in Saint Petersburg (13 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.
