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Hi Johanan
Very intersting pupa indeed of this Ephydrid species. The long and somewhat pointed pair on the left are the anterior spiracles, the short and blunt pair on the right are the posterior spiracles and have (I think) more of a breathing function than this long anterior spiracles. I have once seen a drawing of a pupa almost similar as yours, but I can't remember where, I think in Ferrars' breeding guide or in Hennigs monograph, but a copy is in my lab (and now I'm at home). The first genus that came into my mind was Brachydeutera, but not sure if this is a southern hemisphere genus. The best way to know for sure is to breed them to the adult stage and keep the adult alive for at least 1 day, for the wings to unfold and harden. In fact, pupa are more easier to breed than larvae, for they don't eat. I will have a look tomorrow, I'll keep you posted.
By the way, I'm not familiar with adult flies :S