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First time I challenge Pkatypezidae :o.
All you said about family and gender is correct.

1) dm-cu present, no median fork, 1st tarsomere III really elongate -> s.f. Callomyiinae

2) 1st flagellomere short/conical (I admit not much visible), R1 with micro-spines (clearly visible in the last photo...zooming a little in the sc area) -> Callomyia sp.


C. elegans male.

Hope the description is useful. Otherwise sorry for all this speeches! :)