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Thanks for pointing out the volvulus
It is clear that volvulus is somehow associated with volvare = to rotate.
In this case, the fly rotates with its wings (like many Tephritidae).
In which case volvulus would mean 'rotated'. But my dictionary doesn't give this form.

And yes, being a bad latinist doesn't make you a bad dipterologist.
I agree that Rondani was state of the art in his time, as far as dipterology is concerned.


Theo