Thread subject: Diptera.info :: Gymnosoma with triangles

Posted by Zeegers on 12-07-2020 16:10
#3

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

https://nl.m.wikipedia.org/wiki/Cistogaster
Theo