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Suillia is well-covered and actually one of the most up-to-date families still in Bei-Bienko, although some species-pairs require genital studies.

The other heleomyzid genera can occasionally be more problematic, you're right.

You can put inquiries in the "General query"-department here or send pictures. Andrzej is a real heleomyzid specialist here and I am also interested in hearing about the Swedish species (although bad at determining from pictures).