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It resembles Ephydridae. Anterior spiracles are typical for some Ephydrinae. Canacidae seem to have more complex anterior spiracles. Salt waters are good for Ephydra, Scatella, some Scatophila. This larva has no long breathing divergating tube. Resembles Scatella. Short posterior breathing tubes present for example in Scatella subguttata. I hope it is mature larva, for as you know, larvae of 1-2 instar may look different from matures.:|