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Guide to New Zealand's freshwater invertebrates
Hydrobiosella caddisfly larvae have a pale body with orange head and prothorax (first segment behind the head). The hind edge of the pronotum (which covers the prothorax) is marked by a thick black band.
Hydrobiosella larvae are common in many stony bush-covered streams.
They are known to be both collector-gatherers (feeing on organic detritus and algae) and predators (feeding on other stream invertebrates).
An abundance of Hydrobiosella larvae indicates good water quality, particularly where mayfly and stonefly nymphs are also abundant. They have high tolerance values of 9 (hard bottom sites) and 7.6 (soft bottom sites).