Diptera.info

Posted by BLecaplain on 08-01-2025 21:59

Second post (first : https://diptera.i...ost_473967

Found in a alkalin marsh (by Malaise trap - 04/07/2024).
- notopleural lobes yellow/orange
- first and second antennal segment orange
- basal callus brown
- orange on tergite 1-3 with an extension on tergite 4
- black hairs on tergite 2-3
- subgenital plate with basal notch

With light notopleural lobes, bimaculata is exclude, distinguenda doesn't have black hairs on tergite 2-3 (and a different subgenital plate) and muehlfeldi have the two first antennal segment grey and not orange.

So for me : solstitialis too

Edited by BLecaplain on 13-01-2025 14:35

Posted by Zeegers on 10-01-2025 20:20

Weird. Except for the first antennal segment, this is distinguenda all over.

Are youx very sure you got the right foto for the antenna ?

Theo

Posted by BLecaplain on 10-01-2025 22:32

No doubt this is the same specimen in all photos.
We have too more orange on tergite for solstitialis ?
Subgenital plate doesn't match for distinguenda no ?

Edited by BLecaplain on 10-01-2025 22:33

Posted by Zeegers on 11-01-2025 11:08

Subgenital plate is shown slightly asymmetrical, so difficult to judge, but I guess you are right.
Should be solstitialis. They tend to be more yellow to the south (= ciureai Seguy)

Theo

Posted by BLecaplain on 11-01-2025 11:24

#10

The convex base of the subgenital plate is not a good criteria for solstitialis ?
The cerci are not enough visible to compare with distinguenda.

Posted by BLecaplain on 13-01-2025 10:28

#11

I cleaned the genitalia to extract the cerci and furca

Edited by BLecaplain on 13-01-2025 10:29

Posted by BLecaplain on 13-01-2025 10:30

#12

Cercus is less rounded than in distinguenda.
Base of furca, if this feature could be use (and not variable), different from distinguenda's one.

Posted by Zeegers on 24-01-2025 21:57

#14

Yepd, i think you are totally right.
Well illustration why we should check genitalia !!

Well done

Theo