(yun. rhyaks, -akos, sel ve philos. dost’tan). Kısa kısa ama hızlı uçan, küçük bedenli böcek cinsi. (Larvası bacamsı yuvalar yapmaz, sel yutaklarındaki taşlann altında yaşar. Rhyacophi- lidae familyasının örnek tipi.)
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