An unidentified bark louse
Human body louse
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Superorder: Paraneoptera
Order: Psocodea

Psocodea is a taxonomic group of insects comprising the bark lice, book lice and true lice.[1] It was formerly considered a superorder, but is now generally considered by entomologists as an order. Despite the greatly differing appearance of lice, they are believed to have evolved from within the former order "Psocoptera", which contained the bark lice and book lice.[2] Psocodea contains around 11,000 species, divided among seven suborders.[1][3]


  1. 1 2 P. J. Gullan & P. S. Cranston (2010). "Taxobox 17 – Psocodea: "Psocoptera" (bark lice and book lice)". The Insects: an Outline of Entomology (4th ed.). John Wiley & Sons. p. 479. ISBN 9781444317671.
  2. C. H. C. Lyal (1985). "Phylogeny and classification of the Psocodea, with particular reference to the lice (Psocodea: Phthiraptera)". Systematic Entomology. 10 (2): 145–165. doi:10.1111/j.1365-3113.1985.tb00525.x.
  3. David Grimaldi & Michael S. Engel (2005). "The paraneopteran orders". Evolution of the Insects. Cambridge Evolution Series. Cambridge University Press. pp. 216–330. ISBN 9780521821490.

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