Figure 1 in Molecular data on Phyllodistomum macrocotyle (Digenea: Gorgoderidae) from an intermediate host Dreissena polymorpha (Bivalvia: Dreissenidae) in the Northern Dvina River Basin, Northwest Russia

Figure 1. Map of the study area: A) Geographic position of the research area (red color frame and red color point); B) The Northern Dvina River Basin (red color flags indicate points where zebra mussels infected with Phyllodistomum macrocotyle were found); C) Habitat of zebra mussel, the Yuras River; D) Trematode sporocysts located within the gills of Dreissena polymorpha.