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Good evening
I would be interested with your opinions regarding this larva

living in a strange pond whose I suspect the water very polluted (today by soap or detergent)
I propose a picture of this larva I found floating close to a plant piece.
This larva has alike a pair of short prolegs close to the head (mouth) aperture
The length of the contracted body is about 6 mm



the head




anal spiracles




Could it be a Scatophagidae ?
thanks for the help
Solito de Solis