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I found an intersex specimen of Platycheirus peltatus : it has largely female morphology, like eyes widely separated, but male genitalia (at least externally). The front tibia is of intermediate width, but the front leg lacks the bristles characteristic of the normal male.

Searching for 'intersex' on this forum, I found this thread:

http://www.dipter...9#post_439

I wonder, is this the kind of intersex discussed there? Does anyone know what causes this condition? (I suppose there can be multiple causes..)

Unfortunately, my camera stopped working, so i can't spost pictures right now.

And, now i'm thinking about it: what its the sex determination system in Syrphidae? I learned that in Drosophila it is the same as in us humans, i.e. an xx / xy system, but on the other hand, some lineages of Musca domestica have sex determining genes on autosomal chromosomes. So maybe this is quite complex and variable in Diptera??