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Examples
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They live as parasites on various water insects, such as Dytiscus, Nepa and Hydrometra, and when mature live free in the water, though Von Baer observed an adult Hydrachna concharum living parasitically on the gills of the fresh-water mussel,
Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses 1872
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Then succeed in the natural order the water mites (Hydrachna), which may be seen running over submerged sticks and on plants, mostly in fresh water, and rarely on the borders of the sea.
Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses 1872
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