Psocidae

Definition

A family of barklice (order Psocodea) comprising small, soft-bodied insects that feed on lichens, algae, and organic detritus on bark, rocks, and leaf litter. Members are distinguished from other psocid families by features of wing venation, genitalia, and tarsal structure; many species are wingless or short-winged.

Etymology

From Greek psōkhē 'to rub' + -idae (family suffix), referring to the gnawing mouthparts characteristic of the group.

Example

The common barklouse Psocus bipunctatus (Psocidae) often aggregates in dense colonies on tree trunks, where its grazing activity contributes to nutrient cycling in forest ecosystems.

Related Terms

• Psocodea
• Psocoptera
• barklouse
• booklouse
• Liposcelididae
• Trogiomorpha
• Troctomorpha
• epizoic

Usage Notes

Psocidae is one of the largest families within Psocodea, though family-level boundaries have been revised with molecular phylogenetics; some former psocid families are now subfamilies within an expanded Psocidae. Winged and wingless morphs may occur within single species. Distinguished from Liposcelididae (booklice) by habitat preference and morphological details.