Thread subject: Diptera.info :: Pollenia spec.? <=

Posted by BeJoCo on 24-02-2026 18:32
#1

Hello everyone!

Is my identification of the genus correct?
If so, could it be Pollenia vagabunda?

Size: < 10 mm
Date found: February 24, 2024
Habitat: on the garden-facing wall of the house, in full sun
Location: in a village, Nuremberg region, 340 m above sea level

Edited by BeJoCo on 25-02-2026 19:53

Posted by BeJoCo on 24-02-2026 18:33
#2

a 2. picture

Posted by eklans on 25-02-2026 09:27
#3

Female Pollenia is correct, but P. vagabunda has a dark basicosta - your fly's bc is pale. It seems, that it has only 1 ad on mid tibia - could be a P. angustigena (overwinters a an adult), but not enough details to be sure.
Olga Sivell (2021): Blow flies

Posted by BeJoCo on 25-02-2026 13:03
#4

Hello Eric,
thank you for answer.
I'd like to ask for your help, as I'm a layperson.
You mentioned the basicosta. In diagrams, I only ever find the terms Costa and Subcosta.
The image below is a section of another photo of the same animal. Here, I've marked the Costa in red and the Subcosta in yellow (as I understand it). Is that correct, and where is the basicosta?

Posted by BeJoCo on 25-02-2026 13:05
#5

Here the tibia of the same animal.

Posted by Jan Willem on 25-02-2026 13:50
#6

You can find an overview of the wingvenation in for example: https://www.dipte...132016.pdf

Posted by eklans on 25-02-2026 13:59
#7

Hello Bernd, I've enhanced the brightness of your first image to show you the basicosta (bc), a small sclerite at the base of the costa - small but important for indentifying flies.
This paper could be a big help in learning to identify brachycera:
Tschorsnig, Herting (1994): Raupenfliegen Mitteleuropas
It's available under https://www.biodi...e/33533805, in German and contains a definition of the terms and many drawings!

Posted by eklans on 25-02-2026 14:01
#8

Gold medal for Jan Willem |t

Posted by BeJoCo on 25-02-2026 19:50
#9

Hello Jan Willem, hello Eric!

Thank you so much for your efforts and the links, and for Eric's explanation using my own example.
I had to take a closer look at all of that.
That's a lot of information. A lot to take in for an old man. B)