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This pupa was found in a ditch in the southwestern part of the Netherlands (Goeree, 15.ix.2011). In habitus it reminds me of an Ephydridae but it has some typical features unlike any Ephydridae I have ever seen. At the posterior edge of the anal segment there a two large ventral hooks, just in front of the posterior stigma. The anal segment itself appears rugose by its numerous smaller hooks. The other abdominal segments are almost bare, except for the the ventral pseudopods which has two rows of larger hooks. The posterior stigma has 3 curved slits, the anterior stigma has a few lobes (difficult to count, but it appears as having 4-5 stigma), as in many other Ephydridae.
Does anybody recognize this specimen?

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You've stumped me with this one! Hopefully you can rear some adults ...

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15.ix.2011.... No chance to rear???

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Something like such structures (posterior hooks )present on pupa of Allotrichoma (Pseudohecamede) abdominale, the figure of which is given in "First symposium on the systematics and ecology of Ephydridae", 1979, but general type of the pupa structure is different (anterior part much longer and posterior breathing tubes much shorter)

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no chance in rearing it, most pupa don't react that well to ethanol
In most cases we/I get preserved material for identification. Only If I collect it myself during sorting, it has a chance of survival. Our team (private company) processes over 600 aquatic invertebrate samples a year, so there isn't much time (and money) for rearing. In the past I have reared some Ceratopogonidae en Ephydridae, but I'm not keen on adults and there isn't time

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If there are any specimens from a late winter or spring collection, they might contain pharate adults - usually it is possible to see whether adult structures are present. If so, it may be possible to identify the genus.

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Same place, same pupa, but now EXACTLY 3 years later (15.ix.2014). I was able to photograph the cephalopharyngeal skeleton and the anterior spiracle. The latter has 7 lobes. Still have no idea. A yet undeveloped, and consequently unidentifyable, adult was present within the pupal case.

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head...

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Late reply but it is a puparium of Sepsis sp. (Sepsidae)

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Thank you very much. Although late, i still appreciate your answer because untill now I still didn't know what it was
All the best