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In another sample of a high intertidal saltmarsh along the Scheldt estuary (Belgium), I found besides Ceratopogonidae and 2 Limoniidae (see picture) another larva (the one on top of the photo).
Perhaps a four-lobbed Limoniidae or Dolichopodidae?

Any idea?,

Jan

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Dolichopodidae, probably Hydrophorus

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Thanks for your help, Tony!
A photo of the anal segment included. Brings this confirmation for Hydrophorus?

Jan

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I don't think we should commit into any genus name, since the larvae of some genera of dolichopodids living in this habitat are still completely unknown. But Hydrophorus isn't a bad bet.

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As Kahis says, we can't be certain, even with a specimen - many of the larvae of different genera look very similar, so until they are all described, we can only say "possibly" or "probably"! :)