The New Zealand hydrobiosid caddis larvae have pincers on their forelegs. Edpercivalia larvae are best recognised by the shape and colouring of the prosternal plate (between the forelegs). This plate is slightly wider than long, and has a strong “bump” in the black pigmentation at the midpoint of the hind edge.
Edpercivalia larvae are most common in South Island stony streams, particularly in mountainous areas.
They are predators, feeding on other stream invertebrates.
Edpercivalia are most likely to be found in cold water streams with good water quality. They have tolerance values of 9 (hard bottom sites) and 6.3 (soft bottom sites).