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I looked through Ephydridae literature which I have. The only known species with extracted papillae Ephydra gracilis (=E.cinerea), salt waters. However Ephydra larvae have 3(4) branches of anterior spiracles. We see here at least 6. Some larvae of Parydra and Cirrula have 6 branches, but Parydra has no well developed hooks on ventral creeping welts which I see here. So among known larvae we can think about Cirrula only, but all of them are in salt water and nobody has written about extracted anal papillae in Cirrula. I have read that papillae may be extracted more or less if the salinity of water changes but never observed this myself in Ephydridae.
So, I am sorry, but can not determine this larvae better than it is Ephydridae and subfamily Ephydrinae.:|