Diptera.info

Posted by Ruth Ahlburg on 23-10-2007 10:43

Maybe Geomyza hackmani?
Seen 2. june 2007 in my garden close to Copenhagen, Denmark.
Best regard
Ruth Ahlburg

Posted by Jan Willem on 23-10-2007 13:40

Hi Ruth,

I think it is a male of Geomyza balachowskyi, but I have to admit that it is possible that you are dealing with a male of G. hackmani. Did you collect the specimen? If so, studying the genitalia will give the answer! If you collected the specimen and you would like me to study it, I will be glad to help you.

Jan Willem

Posted by Kahis on 23-10-2007 14:01

Your specimens has darker wing bases than the G. hackmani specimens I just identified. Otherwise, it is pretty much identical with this species.

Posted by Ruth Ahlburg on 23-10-2007 14:45

Kahis wrote:
Your specimens has darker wing bases than the G. hackmani specimens I just identified. Otherwise, it is pretty much identical with this species.

Hi Jan and Kahis!

I don?t collect specimens, - I just take pictures, and I know it makes the determination uncertain, but I?m just an amateur.
Do you know whether both species live in Denmark?

Best Regards
Ruth

Posted by Kahis on 23-10-2007 15:51

Ruth Ahlburg wrote:
Do you know whether both species live in Denmark?

Both species have been found in Denmark. G. balachowskyi is more numerous but both species are rather common.

Posted by Ruth Ahlburg on 23-10-2007 16:29

Then, I think, we are at the end of this thread.
Thank you for following me.
Ruth

Posted by Jan Willem on 24-10-2007 11:47

The reason why I think it is G. balachowskyi and not G. hackmani is that the part of the thorax under the scutellum is normally distinctly darker in G. hackmani. In The Netherlands, G. hackmani is rather scarce and G. balachowskyi very common. It is certainly probable though that G. hackmani is less scarce in Denmark. To my opinion, you can best label your specimen Geomyza cf balachowskyi.
Sorry for still giving comments after your decision to end this thread;).

Jan Willem