The Megalyroidea are a small hymenopteran superfamily that includes a single family, Megalyridae, with eight genera (plus three extinct ones) and at least 45 extant species. Modern megalyrids are found mostly in areas of relict primary tropical forests, with very few New World representatives. The most abundant and species-rich megalyrid fauna is in Australia. Another peak of diversity appears to be in the relict forests of Madagascar, but most of these species are still undescribed.