Bruchidius siliquastri
In 3 days ~10% in a week ~20%
Bruchidius siliquastri is a species of bean weevil. It was first found in pods of Cercis siliquastrum in China, and has thence been found in several continents. Its length ranges from 2.8 to 3.7 millimetres (0.11 to 0.15 in). Its body is short and ovate, with a black integument. The apex of its femora and the ventral part of its hind tarsi are reddish. Its vestiture is made of thin and short setae; dorsally setae are a whitish colour, denser on the scutellum. Its pygidium is also covered with setae. Its name is derived from its host plant.
The head of the male is short, with bulging eyes. Its frons lacks a carina. Its pronotum is very convex, wider at the base, while the elytra are short; its third stria possesses a small tooth. The hind femora are incrassate, with a carinate mesoventral margin. The hind tibiae are apically widened, with both dorsomesal and ventral carinae that are strong. Its first tarsomere does not have an apical denticle ventrally.
On its abdomen, ventrite 5 is emarginate, as long as the 4th sternite. Its first ventrite has a patch of short erect setae basally, which are somewhat scaly. Its pygidium is subcircular, with its apex turned... Wikipedia →
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Rare
Under 5% of wildlife watchers report a Bruchidius siliquastri sighting in Vienna on a given day, based on 8 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Bruchidius siliquastri in Vienna on a given day, so our monthly data shows no clear season.
Among the best
Of the 2 cities where we can rate Bruchidius siliquastri sightings, Vienna ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Paris (France, under 5%).
Same family: Chrysomelidae
The closest relatives of the Bruchidius siliquastri 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 Bruchidius siliquastri is recorded against all the insects logged in Vienna (8 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.
