Plecoptera, Perlidae and most probably Perla sp. and probably Perla grandis. Please, verify. Stoneflies are usually not my business...
Could also be the exuviae/exoskeleton!
Anche chiamata grande plecottero, ninfa.
http://www.moscaclubcampania.org/articoli/13-i-plecotteri-nozioni-entomologiche.html
Du solltest ja deutsch lesen können ;-)...
http://www.fachdokumente.lubw.baden-wuerttemberg.de/servlet/is/50142/pabl250027.html?COMMAND=DisplayBericht&FIS=200&OBJECT=50142&MODE=BER&RIGHTMENU=null
http://www.acremar.it/Articoli/HTML%20Articoli/Mondo_sommerso.html
http://www.naturamediterraneo.com/forum/topic.asp?TOPIC_ID=143856
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