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Thanks Atylotus
I will observe better now and make the best with your infos

I make a profit with this topic to put a few pictures about the Stratiomyidae cuticula
from an exuvia found in the sample I could observe this

like transparent glass or cristal parts on a dark skin

The reason for the small reflections when the larva is observed...

The color and the pattern of the cuticula are seen through these transparent pieces








profil