Thread subject: Diptera.info :: Neoascia pictured in Belgium on 2023-05-06

Posted by Tetrao on 01-06-2023 17:45
#1

Hello everyone !!!

I pictured this specimen in my garden on 2023-05-06 and could measure it on pictures : 6,3mm. The ratio of length to width of third antennal segment is 1.64 so largely under 2x !

Can we ID this specimen ???

I think it is a Neoascia , perhaps Neoascia interrupta (Meigen, 1822) , male ?

The transverse veins of the wings are spotted and I can see yellow spots on the tergites 2,3 and 4 ...

In Belgium, Four species whose wings have darkened transverse veins.
- Neoascia podagrica,
- Neoascia interrupta,
- Neoascia obliqua and
- Neoascia unifasciata.

If there are other, I would be happy to know !

Of those species only one has the third antennal segment with the ratio between length and width less than 2 : N. interrupta !

Steven Falk has album in Flickr :
N. interrupta : https://www.flick...147899879/

N podagrica : https://www.flick...1638744863

Not only the spots on the tergites are different, but also the colour of the third antena's segment ...

I put many pictures as I dont know which one could be the most diagnose...

Can you help me ?

observations.be/media/photo/67921474.jpg

observations.be/media/photo/67921475.jpg

observations.be/media/photo/67921476.jpg

observations.be/media/photo/67921477.jpg

observations.be/media/photo/67921630.jpg

observations.be/media/photo/67921631.jpg

observations.be/media/photo/67921632.jpg

observations.be/media/photo/67921633.jpg

Thank you for reading this post , comments or ID !!!

Have a nice day,
Didier

Edited by Tetrao on 02-06-2023 09:43

Posted by Tetrao on 05-06-2023 08:21
#2

Can anyone confirm this observation or identify this Neoascia ?
Thank you !!!

Posted by helge on 05-06-2023 10:53
#3

Neoascia cf. podagrica

Posted by Tetrao on 05-06-2023 15:11
#4

Thank you very much Helge !
Why not N. interrupta with such markings and such ratio for the 3D antenna’s segment ?

Posted by Tetrao on 05-06-2023 16:35
#5

On the picture below I can see a yellow spot on the tergites 4 as on the tergites 2 and 3.
Do you agree with me ?
observations.be/media/photo/68284072.jpg

Posted by helge on 06-06-2023 07:46
#6

Hi Tetrao,

I can only see two yellow spots (T2 & T3), the third is just a reflection of the flash light used. The third segment of the antenna looks elongated.

Helge

Posted by Tetrao on 06-06-2023 09:24
#7

I don't use a flash light and this yellow spot appear on all pictures in dorsal or profil views ! I measured the third segment of the antenna : the ratio is 1,64 ! In all keys I could find and read they say : More then a ratio of 2 then go to ... N. podagrica and less then 2 go to ... N. interrupta. I measured this ratio on Steven Falk specimen : 1,48 !

Thank you very much for reading my post and commenting about your ID.
Didier

Here in the shadow !

observations.be/media/photo/68331342.jpg

Edited by Tetrao on 06-06-2023 09:33

Posted by helge on 06-06-2023 09:35
#8

your welcome!

Helge