A very large family of very small flies with hairy wings! There are about 6,000 named species; about 90% of them remain unknown and the experts are unable to estimate the number that exist in the tropics. They are very host specific and some identifications cannot be made without knowing that information. Although the name hints at these flies making galls, not all of them do. There is a wide range of habitats that sustain these flies. The larvae of this family have the ability to reproduce before they mature. The adults are known to form mating swarms.
The larvae of this family have the ability to reproduce before they mature. Some species are predaceous and feed on mites, other insects larvae, and aphids. A few species are internal parasitoids of aphids and psyllids.
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