Posted by John Carr on 14-10-2023 15:41
#2
The most common fly you will see is
Drosophila suzukii. The male has a black spot near the wingtip. The female wing is clear. This species is in the species group discussed in the paper you linked.
I think only males of some
Sphenometopa have wing spots.
Many species have sexual dimorphism in pattern or intensity, for example most of genus
Chrysops and one of the European
Rivellia.