Six families, with around 950 species in Australia. Very small in size (0.5-15mm), body elongated and cylindrical with three pairs of legs, each of which terminate in a specialised bladder-like organ instead of tarsal claws. Wings, when present, are membranous and hairy, the forewings larger than the hindwings. Individuals can be single-sexed or bisexual, and parthenogenesis is common, with females produced from unfertilised eggs. Most feed on pollen and flowers, and a few on fungus, and small number of species, mainly introduced, can be pests of commercial orchards and gardens. Most species distributed in eastern Australia.