Marketable mussels Mytilus qalloprovlncla0's traded with commercial certification from production sltes in Italy and abroad (France, Spain) were exarnlned for the presence of A4ytrllcola intestinalls (Copepoda. Mytllicolidae) and Urastoma cyprlnae (Turbellana Hypotrichlnidae) from October 1994 to February 1996. The prevalence of M. intestlnahs was 4 1 % and 4.7% respectively In mussels from Lerici (La S p e z~a ) and S Pietro in Volta (Venice), whereas ~t rose to 57.9% in the samples from Spain. A4. intestinalis was absent In mussels from C h i o g g~a (Venlce). Ganzlrn (Messina), Taranto, Tneste and France. The prevalence of U cyprinae vaned considerably, ranging from 0 . 3 Y in mussels from Trani (Bari) to 33 2 % and 86.3% respectively in those from Chioggia and Tr~este. It was 85 7 "h in samples from France and 63.7 ";P in those from Spain KEY WORDS-Mytilus galloprovinclaljs . Mytlllcola ~ntestinalis . UI-astoma cyprinae . Paras~tology Epidemiology
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