Xiphydriidae

Definition

A family of wood wasps (Hymenoptera: Symphyta) comprising approximately 150 species worldwide. Members are characterized by an elongated, slender neck (petiole) connecting the thorax to a small, dome-shaped head, and by larvae that bore into dead wood of various tree species. The family represents one of the more derived lineages of the sawfly-parasitoid grade within Hymenoptera, with fossil records extending to the mid-Cretaceous.

Etymology

From Xiphydria (type genus, from Greek xiphos 'sword' + hydria 'water jar') + -idae (family suffix)

Example

Xiphydria prolongata, a widespread Palearctic species, develops in dead branches of deciduous trees including beech and oak, with larvae creating longitudinal galleries in the heartwood.

Related Terms

• Symphyta
• Siricidae
• wood wasp
• wood borer
• petiole
• Hymenoptera

Usage Notes

Distinguished from the superficially similar Siricidae (horntails) by the slender neck and dome-shaped head; Siricidae have a more robust, cylindrical body without such pronounced constriction. The family is sometimes grouped with Siricidae and related families in the informal 'wood wasp' assemblage, though Xiphydriidae lack the symbiotic fungal associations characteristic of Siricidae. Subfamilies include Derecyrtinae and Xiphydriinae.