Eustheniidae is a family of insects in the order Plecoptera, the stoneflies. They are native to Australia, New Zealand, and Chile. The nymphs live in lakes and in swift-flowing rivers and streams, where they cling to rocks. They are carnivorous. They take two to three years to develop into adults. Genera include: \n* Cosmioperla \n* Eusthenia \n* Neuroperla \n* Neuroperlopsis \n* Stenoperla \n* Stenoperlidium \n* Thaumatoperla