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Posted by Juergen Peters on 30-10-2023 15:27

Hello,

a 3.5 mm Drosophilidae in the house yesterday (northwest Germany). Can it be Drosophila hydei?

Edited by Juergen Peters on 31-10-2023 16:21

Posted by Jan Maca on 30-10-2023 18:04

Do you have a possibility to make a picture from the side? From this picture I can rather consider a very dark immigrans or a member of virilis group (apparently not D. funebris because of different 4v-index).

Posted by Juergen Peters on 30-10-2023 18:52

Hello Jan,

Jan Maca wrote:
Do you have a possibility to make a picture from the side?

at least, the fly still lived today, it was flying in our store room. But I think, it was rather by incident that I saw it one more time...

From this picture I can rather consider a very dark immigrans

Shouldn't that species posess darkened veins?

or a member of virilis group (apparently not D. funebris because of different 4v-index).

Thank you very much. If I see the fly again, I will try my best to get a lateral photo.

Posted by Juergen Peters on 30-10-2023 20:46

Hello once more,

against all chances I really got it sitting on a mirror. Not completely lateral photos, but rather from the side. Not sure, if they are good enough...

Posted by Jan Maca on 31-10-2023 06:44

The first photo demonstrates how the identification from only one picture can be tricky. This picture did not show spotted mesonotum, on the other hand there were slight "shadows" on transverse veins. Thank you for making the second photo of apparently the same specimen. Now I agree that the fly is D. hydei. Btw, having only the second photo, one could believe that this fly has black wings :)