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Some doubts have been raised by Swiss dipterists about the identity of this fly. Therefore, I sent it to Martin Ebejer, a world expert on Lauxaniidae. Martin has agreed that I post his comments here:
"This specimen is a real enigma! It does not run through any key with any level of confidence except to suillorum and punctiventris, but clearly it is neither of these two. I cannot match it with any of the species in my collection. The terminalia are unusual as well.
It would take me a long time to dissect females of several other species to see if it matches any of them, but there also I have a difficulty because it does not match any of my specimens on external features to begin with. Also, hardly any female Minettia that I do not have had the female terminalia illustrated.
Is there any chance this came from outside the Palaearctic? If definitely wild caught in Switzerland, then you should (with a lot of patience, some perseverance and a little luck) find more specimens including males.
I’m afraid I cannot give you an identification for this one."

Of note, I collected this fly dead in my kitchen. It may have come from outside but one has also to contemplate the possibility that it came with a parcel from abroad or from a foreign good we bought.