Potamon fluviatile (Herbst, 1785)
exuvia
http://www.regionepiemonte.it/parchi/riv_archivio/2000/101nov00/gall_imm.htm (for the authorization see here)
uploaded September 2006
Photo by Fabio Liverani (http://www.fabioliverani.com) uploaded by Esculapio
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