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Hydrometra bugs live on the surface of the water, usually in ponds or wetlands, and most commonly in the North Island.
They are predators, feeding on other pond invertebrates. Overseas Hydrometra are known to feed on other pond predators including dragonflies and dytiscid beetles.
Hydrometra are only likely to be found on the water surface of stagnant (or near stagnant) waters. Because they don’t live under water they may have limited value as water quality indicators. They have not been assigned any tolerance values.