Diptera.info

Posted by Bruno48 on 12-02-2025 21:20

Hi

I wonder if this Mycetophilidae may be Zygomyia semifusca. It is quite little (2,5mm).
Thank you for help.

www.galerie-insecte.org/galerie/image/dos354/big/Zygomyia_semifusca_Malaise_PtColasP5_fev252.jpg

Bruno RIGHETTI : France : Bédouès-Cocurès : 48400 : 04/02/2025
Altitude : 607 m - Taille : 2,5 mm
Réf. : 354323

www.galerie-insecte.org/galerie/image/dos354/big/Zygomyia_semifusca_aile_Malaise_PtColasP5_fev252(1).jpg

Bruno RIGHETTI : France : Bédouès-Cocurès : 48400 : 04/02/2025
Altitude : 607 m - Taille : 2,5 mm
Réf. : 354325

www.galerie-insecte.org/galerie/image/dos354/big/Zygomyia_semifusca_thoraxVl_Malaise_PtColasP5_fev252.jpg

Bruno RIGHETTI : France : Bédouès-Cocurès : 48400 : 04/02/2025
Altitude : 607 m - Taille : 2,5 mm
Réf. : 354326

Posted by Walther Gritsch on 15-02-2025 19:26

No, it isn't Zygomyia, but Mycetophila sp. Zygomyia lacks the cubital fork. I'm not familiar with the French fauna so I won't hazard a guess as to the species.

Posted by Bruno48 on 16-02-2025 11:29

Thank you Walther. Z. semifusca is the only Zygomyia with a posterior fork, but this fork is much shorter than median fork. P. chandler indicate "less than half lenght of median fork. That is the reason why I Tthought it is Z. semifusca.

Posted by Bruno48 on 16-02-2025 12:05

Is the shape of anepimeron discriminant between the two genus ? If it is, this one is Mycetophila indeed !

Posted by Walther Gritsch on 16-02-2025 22:54

Well, I've never seen Z. semifusca, but the upper branch of the posterior fork is supposed to be very weakly developed, which doesn't seem to be the case here. The shape of anepimeron and/or anepisternum is similar in the two genera.
Have a look at the semifusca wing here https://sciaroidea.myspecies.info/taxonomy/44966