This is a family of tiny egg parasitoids with nearly 1,000 species. The adults are minute, typically less than 1 mm. Many species are important biological control agents which parasitise the eggs of a large variety of insect pests, in particular Lepidoptera.
Apart from the small size, the family is characterized by their fringed wings and the 5-9 segmented antennae and the short pronotum.
The following genera and individual species are currently entered under the family Pteromalidae: