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Gymnosoma are quite difficult to identify
(or, I should say: very very difficult)
buth this looks to me as a quite typical G. rotundatum.
Features in the female:
scutellum with dust spot at apex
hind part of thorax without clear light dusting
black on parafrontalia not reaching to base of antenna
but stopping at about 1/2 - 2/3


Theo Zeegers