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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?