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Breathing tube of these pupae is a little longer than in typical Scatella (Ephydridae). Resemble Parydra very much. If the size of the pupae (without breathing tube) is about 6-9 mm it may be Parydra. Sometimes it may be useful to collect imagoes if you see them at the moment when you are collecting larvae. It may be of the same species. One of the common species of Parydra in Spain - P. coarctata.