Nanopsocetae

Definition

An infraorder of small, often apterous or brachypterous insects within the order Psocodea (booklice and barklice), one of two major divisions of the suborder Troctomorpha alongside Amphientometae. Members are characterized by reduced wing venation, small body size, and frequent association with leaf litter, decaying vegetation, or vertebrate nests. The group comprises more than 20 families and over 5,200 described species, including the common booklice family Liposcelididae and the ant-associated Sphaeropsocidae.

Etymology

From the type genus Nanopsocus Pearman 1928 (Greek nanos 'dwarf' + psōkos 'louse') + the family-group suffix -etae

Example

The Liposcelididae, a family within Nanopsocetae, are among the most frequently encountered psocids in stored products and domestic environments, where species like Liposcelis bostrychophila feed on mold and dry organic debris.

Related Terms

• Troctomorpha
• Amphientometae
• Psocodea
• Paraneoptera
• Liposcelididae
• Sphaeropsocidae
• booklice
• barklice

Usage Notes

The rank infraorder is applied here following modern phylogenetic treatments of Psocodea, though some historical classifications treated Nanopsocetae as a series or informal group. The group is distinguished from Amphientometae primarily by wing reduction and associated morphological simplification. Not all families within Nanopsocetae are universally agreed upon; molecular phylogenetics continues to refine relationships among the 'Psocoptera' grade within Psocodea.