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View Thread :: Identification queries :: Diptera (adults)
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Gymnosoma with triangles
Maik Hausotte
#1 Print Post
Posted on 05-07-2020 14:35

Posts: 206
Joined: 09.12.19

the Gymnosoma-species seem to be very variable…
I have no idea with this fly from July 4th 2020 from Leipzig (Saxony/Germany).
Thanks for your help,
Maik Hausotte attached the following image:

#2 Print Post
Posted on 12-07-2020 15:27
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Location: Berlin, Germany
Posts: 3524
Joined: 28.07.07

Looks like a male Cistogaster globosa.
#3 Print Post
Posted on 12-07-2020 16:10

Location: Soest, NL
Posts: 15397
Joined: 21.07.04

Dark triangles nearly always = Gymnosoma nitens. As you might observe, it is a male (narrow vertex without black), yet the thora lacks dusting. All other males have this dusting anterior to the suture.
G. Nitens is somewhat intermediate between Gymnosoma and Cistogaster,
Male Cistogaster, however, have a different abdominal pattern, for instance
#4 Print Post
Posted on 13-07-2020 00:02
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Location: Berlin, Germany
Posts: 3524
Joined: 28.07.07

Interesting - I never saw a Gymnosoma holding the wings in that way (plane turned nearly upright), which is typical for Cistogaster... Maik's female here (https://www.dipte...d_id=95014) has a different posture. But I admit that the triangles are very regular, and the C. globosa male should have golden pruinosity on the fore half of the thorax. So this Gymnosoma nitens is intermediate indeed! (What would we do without Theo...)
Maik Hausotte
#5 Print Post
Posted on 25-07-2020 10:37

Posts: 206
Joined: 09.12.19

The forum is great! So working with flies is fun. Thank you very much and best regards, Maik
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Date and time
05 December 2020 19:32


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