Stephanus serrator
In 3 days ~10% in a week ~20%
Stephanus serrator is a species of parasitic wasp in the family Stephanidae, the crown wasps. This species is native to much of Europe and is to be seen in the breeding season on recently dead timber or wood products. The larvae are parasitoids of the larvae of wood-boring beetles.
Stephanid wasps are known as crown wasps because the top of the wasp's head bears a group of five tubercles. The somewhat elongated prothorax is connected to the propodeum (the first abdominal segment) by a very long petiole, and the ventral side of the hind femur bears teeth. The male S. serrator averages 9.5 mm (0.37 in) in length and the female 13 mm (0.51 in), with an ovipositor of 11.4 mm (0.45 in). The slender body and legs are black, apart from the front half of the abdomen and certain leg segments, which are red.
S. serrator is known from Spain, France, Netherlands, Italy, Germany, Switzerland, Austria, Czech Republic, Hungary, Romania, Bulgaria, Croatia, Serbia and Montenegro. Adults can be found on and around trees that have been dead for about a year and which contain beetle larvae, but which have not yet been invaded by fungi; this wasp has been recorded parasitising... Wikipedia →
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Stephanus serrator sighting in Berlin on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 869th 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.
June
In that month about 10% of wildlife watchers report a Stephanus serrator in Berlin on a given day, against under 5% in July to May, the lowest months.
Among the best
Of the 2 cities where we can rate Stephanus serrator sightings, Berlin ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Vienna (Austria, under 5%).
Same order: Hymenoptera
The closest relatives of the Stephanus serrator that you can see in Berlin (order Hymenoptera, Ants, Bees, Wasps, and Sawflies) are Common Carder Bumble Bee (about 30%), European Hornet (about 20%) and German Yellowjacket (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Stephanus serrator is recorded against all the insects logged in Berlin (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.
