“…One of the two parasites, R. campanula, has been frequently reported in duck mussels (Taskinen & Valtonen, 1995;Taskinen et al, 1997;Taskinen, 1998) and closely related species (Richardson, 1990), but the larvae of trematodes from the Phyllodistomum genus have only occasionally been found in this species of mussels (Taskinen et al, 1991). Phyllodistomum larvae have been reported in swan mussels A. cygnea (Orecchia et al, 1975), zebra mussels D. polymorpha (Laruelle et al, 2002), and North American unionids (Grizzle & Brunner, 2009 Fig. 3 The proportion of A. anatina infected with trematode larvae differed among lakes (A), and females were more heavily infected than males (B).…”