Dictenidia bimaculata
In 3 days ~10% in a week ~20%
Dictenidia bimaculata is a species of crane fly which is widespread throughout the Palaearctic. In the genus Ctenidia, the fourth and succeeding segments of the antennae bear a long basal process and a shorter subapical one. Female antennae have simple flagellar segments, and, apart from the first, are short and roundish, broader than long.
C. bimaculata Linnaeus is a shining, black species; the thorax is black, with more or less extensive orange markings. The abdomen is entirely black in the male, black with anterior orange markings to segments, spreading laterally, in the female; wings with two large dark brown spots, one extending down from stigmatic area to discal cell, the other, somewhat smaller, situated at apex; legs orange, femora and tibiae black-tipped, tarsi blackish. The wing length is 10–15 mm.
C. bimaculata is found in damp woods from April to July Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Twin-Mark Comb-Horn sighting in Vienna on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 1090th 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 Twin-Mark Comb-Horn 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 Twin-Mark Comb-Horn sightings, Vienna ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Helsinki (Finland, under 5%).
GBIF citizen-science records
It is estimated from how often the Twin-Mark Comb-Horn is recorded against all the insects logged in Vienna (7 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.
