Megalyridae

Definition

A small family of parasitoid wasps in the superfamily Megalyroidea (Hymenoptera), comprising eight extant genera and approximately 49 described species. Megalyrids are characterized by their relict distribution, with modern diversity concentrated in the southern hemisphere—particularly Australia and Madagascar—while fossil records are restricted to the northern hemisphere. Adults are typically slender with elongated antennae and reduced wing venation; larvae are endoparasitoids of wood-boring beetle larvae (Coleoptera).

Etymology

From Greek megas (large) + lyros (lyre), referring to the enlarged, lyre-shaped pterostigma in the forewing of type species.

Example

Megalyra rufipes, a large Australian megalyrid, parasitizes larvae of longhorn beetles (Cerambycidae) in Eucalyptus wood; females use their elongated ovipositors to drill through bark and deposit eggs directly into host tunnels.

Related Terms

• Megalyroidea
• Hymenoptera
• Parasitoid
• relict distribution
• pterostigma
• wood-borer parasitoid
• Cerambycidae

Usage Notes

Treat as a family-rank taxon (suffix -idae). Not to be confused with Megaloptera (alderflies and dobsonflies, a separate insect order). The family's disjunct modern distribution versus fossil distribution makes it significant for historical biogeography studies. Most Madagascar species remain undescribed; Australian fauna is best documented.