1 Australian Biological Resources Study, PO Box 787, Canberra, 2601, ACT, Australia
Today's distributions of faunal groups reflect historic events — geological and evolutionary, as well as dispersals, extinctions and chance. To what extent is each of these responsible for the depauperate micro-caddisfly (Trichoptera, Hydroptilidae) fauna of New Zealand? This question is explored by comparison with the fauna, geology and geography of New Caledonia, Tasmania and mainland Australia.