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EN · stoneflies | DE · Steinfliegen | LV · strauteņi | PL · widelnice | RU · весня́нки
https://en.wikipedia.org/wiki/Plecoptera The nymphs are aquatic and live in the benthic zone of lakes and streams. All species of Plecoptera are intolerant of water pollution and their presence in a stream or still water is usually an indicator of good or excellent water quality.
Subclass: Pterygota Infraclass: Neoptera Superorder: Exopterygota Order: Plecoptera
https://en.wikipedia.org/wiki/Plecoptera The nymphs are aquatic and live in the benthic zone of lakes and streams. All species of Plecoptera are intolerant of water pollution and their presence in a stream or still water is usually an indicator of good or excellent water quality.
Subclass: Pterygota Infraclass: Neoptera Superorder: Exopterygota Order: Plecoptera