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Oh, Thank You very Much Atylotus !!:)

Trying to follow the key "Thorp and Covich's Freshwater Invertebrates ", I was thinking of Aeolosoma species, but I was wrong for the absence of "bundels of hairs dorsally and ventrally" as you wrote ...
Thank you again.
Unfortunately the preparation went dry and it is lost ... :(

May be next time !:)