Trematode metacercariae in the extrapallial space of Macoma balthica (Bivalvia) in brackish water (southwestern Finland, Baltic Sea)

Metacercariae, mainly of Lacunovermis macomae (Lebour), were present in Macoma balthica (L.) taken from 6 collection sites, where the depth varied between 5 and 40 m and the salinity between 2 and 7 ‰. Metacercariae were present even in specimens of 4-6 mm shell length. The infection incidence (% of...

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