Ptinus sexpunctatus
In 3 days ~10% in a week ~20%
Ptinus sexpunctatus is a species of beetles in the genus Ptinus of the family Ptinidae. It is commonly known as the six-spotted spider beetle. P. sexpunctatus is one of eleven species of Ptinid in the subgenus Gynopterus. The subgenus was first described by Mulsant and Rey in 1868.
The species is approximately 4–5 mm in length and is a uniform dark colouration. It has very prominent basal and apical patches of appressed white scale. The grooves on the elytra are very deep. Ptinus sexpunctatus is a Palearctic spider beetle (Ptinidae: Ptininae) found throughout Europe. In the United Kingdom it is categorised as 'Nationally Notable B' by the National Biodiversity Network and thus appears in between 31 and 100 hectads (10 km grid squares) across the country. In 2007 it was first recorded as an invasive species in North America where it may have imported with introductions of Osmia cornuta and Osmia cornifrons.
The six-spotted spider beetle has been generally associated with pine forests, although more cosmopolitan sightings have occurred indoors. The larvae of P. sexpunctatus are commensals in the nests of cavity-nesting solitary... Wikipedia →
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Rare
Under 5% of wildlife watchers report a Six-Spot Spider Beetle sighting in Berlin on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 694th most-seen of the 1065 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.
March–April and December
In those months about 10% of wildlife watchers report a Six-Spot Spider Beetle in Berlin on a given day, against under 5% in January–February and May–November, the lowest months.
Among the best
Of the 2 cities where we can rate Six-Spot Spider Beetle sightings, Berlin ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Bucharest (Romania, under 5%).
Same order: Coleoptera
The closest relatives of the Six-Spot Spider Beetle that you can see in Berlin (order Coleoptera, Beetles) are Asian Lady Beetle (about 50%), Seven-Spotted Lady Beetle (about 30%) and Two-Spotted Lady Beetle (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Six-Spot Spider Beetle is recorded against all the insects logged in Berlin (9 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.
