Ectopsocidae

Definition

A family of small psocid insects (order Psocodea, suborder Psocomorpha) comprising fewer than 200 described species, with the majority placed in the genus Ectopsocus. Members are typically found in leaf litter, bark, and other decaying plant material, where they feed on microflora including lichens, algae, and fungal spores. The family is characterized by reduced wing venation and, in many species, brachyptery or aptery in females.

Etymology

From Greek ektos (outside, external) + psōkos (flea or louse), with the family suffix -idae; the genus Ectopsocus was named for its external position relative to other psocid groups in early classifications.

Example

Ectopsocus petersi, a common litter-dwelling species in the Ectopsocidae, shows pronounced sexual dimorphism in wing development, with fully winged males and short-winged females.

Related Terms

• Psocodea
• Psocomorpha
• Ectopsocus
• Psocoptera
• barklice
• booklice
• brachyptery

Usage Notes

Ectopsocidae is one of several families historically grouped as 'Psocoptera' (now paraphyletic and split into Psocodea and Phthiraptera). The family is distinguished from related psocid families (e.g., Psocidae, Caeciliusidae) by subtle characters of wing venation and genitalia; accurate identification often requires slide-mounted specimens and reference to specialized keys. The genus Ectopsocus dominates the family's diversity, though several smaller genera are recognized.