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That is an interesting twist! So an "ephydridish" Sphaerocerid. Thread https://www.dipte..._id=104115 led me to the paper by Gatt (2001, https://www.biodi...9/mode/1up) and the differentiation of the species P. humida and P. jorlii. Conclusion: I need a better picture of the middle tibia. I hope I'll see the flies again, the water-filled rut is certainly dry by now in the heat.
Many thanks, Tony!