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Merci Atylotus

You know that as we have to collect water samples in 8 places if a place in a stream
we need to move and shake aquatic plants, phragmites and bryophits we often find non-aquatic organisms from plant debris such as slugs, ladybugs, a.s.o.
I have been told that they are some CECIDOMYIIDA : PORRICONDYLINAE
living in such as aquatic biocoenosis... (torrential stream France SW)
(http://www.limnol...63p225.pdf )

Regarding the organism found in this pupa, could we ID better ?
Or we have to stop here by lack of features ?
SDS

MAYETIOLIA ?