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During investigation in river Krąpiel valley 7 water mite species new to Polish fauna (Arrenurus falciger,Bandakia concreta, Eylais degenerata, Hydrachna juncta, Lebertia longiseta,Lebertia (Mixolebertia) sinuata,Rutripalpus limicoa) and 29 rare species were recorded.
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Bańkowska et al. (2015) studied this question.
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