Psilopsocidae

Definition

A family of small, soft-bodied psocid insects (order Psocodea, infraorder Psocetae) distinguished by a free areola postica—a membranous region of the wing not connected to surrounding veins—and mottled wing patterns. The family is notable as the only psocopteran group documented to include wood-boring species, a habit otherwise absent in this primarily detritivorous and surface-foraging order. Psilopsocidae is monogeneric, containing the single genus Psilopsocus with seven described species.

Etymology

From Greek psilos (bare, smooth) + psocus (insect that gnaws), with the family suffix -idae.

Example

Psilopsocus mimulus, a member of Psilopsocidae, is recorded boring into decaying wood in tropical forests—a feeding ecology unique among psocids and convergent with certain beetle and hymenopteran lineages.

Related Terms

• Psocodea
• Psocetae
• Psilopsocus
• areola postica
• Psocoptera
• booklice
• barklice
• wood-boring insects

Usage Notes

The family rank is stable, but Psilopsocidae is frequently overlooked in psocid surveys due to its specialized microhabitat and tropical distribution. The free areola postica is a key diagnostic character separating it from other Psocetae families such as Psocidae and Myopsocidae, where this wing region is typically connected by crossveins. The wood-boring habit should not be confused with simple shelter-seeking under bark; true boring involves excavation of galleries in solid or decaying wood.