The digenetic trematode, Proctoeces lintoni, is a parasite of the rocky intertidal ecosystems of the Chilean Pacific coastline. Although this species is relatively well known, the first intermediate host has not yet been described. In the present study, we used experimental protocols and field studies to identify the host that harbors the sporocysts and cercariae stages of the parasite. The first intermediate host was shown to be the dominant mussel of the mid-littoral zone, Perumytilus purpuratus.

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