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A, B. Slow growing and diapausing glochidia of freshwater pearl mussel on the gills of salmon (05.12.2013) from the Syskyänjoki River. Scale: 80 μm. A – glochidia has a rounded completely embedded in gill tissue; B - the exterior (EL) and interior layers (IL) of the mantle, the muscle (M) and gills (G) of glochidia.
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