Psocoptera are a paraphyletic group of insects that are commonly known as booklice, barklice or barkflies. The name Psocoptera has been replaced with Psocodea in recent literature, with the inclusion of the former order Phthiraptera into Psocodea.
Psocomorpha is a suborder of barklice, booklice, and parasitic lice in the order Psocodea. There are more than 20 families and 5,300 described species in Psocomorpha.
Amphipsocidae is a family of hairy-winged barklice in the order Psocodea. Most species are 3.0-4.5 mm long and have many setae (hairs) on the veins and margin of the forewing. The main veins of the forewing are usually lined with two rows of setae. Like the other members of the infra-order Caeciliusetae, they have a broad, flat labrum, with well defined edges.
Pachytroctidae is a family of thick barklice in the order Psocoptera. There are about 15 genera and at least 90 described species in Pachytroctidae.
Caeciliusetae is an infraorder of Psocodea in the suborder Psocomorpha. There are about 6 families and more than 1,300 described species in Caeciliusetae.
Asiopsocidae is a family of Psocodea belonging to the infraorder Caeciliusetae. The family is composed of 14 known species of barklice in three genera: Asiopsocus, Notiopsocus, and Pronotiopsocus. One species from each genus has been found in the United States.
Ectopsocidae is a family of Psocoptera belonging to the suborder Psocomorpha. Members of the family are characterised by their absence of an areola postica in their wings, like in the family Peripsocidae. The family includes fewer than 200 species, most of them in the genus Ectopsocus.
Archipsocidae is a family of barklice of the order Psocodea belonging to the suborder Psocomorpha. Members of the family are characterized by their reduced wing venation. Some species are viviparous. The family includes about 80 species in five genera.
Caeciliusidae is a family of Psocodea belonging to the suborder Psocomorpha. The family was once named Caeciliidae, but the latter name was changed because of homonymy with the amphibian family Caeciliidae. The subfamily Paracaeciliinae was formerly in Caeciliusidae, but it has been elevated to family rank, Paracaeciliidae.
Homilopscocidea is an infraorder of Psocoptera. It is probably a paraphyletic group, still in use for lack of a better solution. There are about 7 families and more than 1,200 described species in Homilopsocidea.
Dasydemellidae is a family of Psocodea belonging to the suborder Psocomorpha, in the infraorder Caeciliusetae. The family is composed of about 30 species.
Cladiopsocidae is a family of Psocodea belonging to the suborder Psocomorpha. Like the other members of the infraorder Epipsocetae, they have a labrum with two sclerotized ridges.
Ptiloneuridae is a family of Psocodea belonging to the suborder Psocomorpha. Like the other members of the infraorder Epipsocetae, they have a labrum with two sclerotized ridges.
Epipsocidae is an insect family of Psocodea belonging to the suborder Psocomorpha, that includes, among others, the genera Bertkauia, Epipsocus, Epipsocopsis, Goja, and the New Guinean endemic Dicropsocus. It includes 16 genera with more than 140 species. The only European species in the family is the apterous Bertkauia lucifuga. Like the other members of the infraorder Epipsocetae, they have a labrum with two sclerotized ridges. Epipsocids are barklice found primarily in tropical regions, and one of their distinguishing characteristics is the hairy ventral surface of the forewing.
Psocodea is a taxonomic group of insects comprising the bark lice, book lice and parasitic lice. It was formerly considered a superorder, but is now generally considered by entomologists as an order. Despite the greatly differing appearance of parasitic lice (Phthiraptera), they are believed to have evolved from within the former order Psocoptera, which contained the bark lice and book lice, now found to be paraphyletic. These insects first appeared in the Permian period, 295–248 million years ago. They are often regarded as the most primitive of the hemipteroids. Psocodea contains around 11,000 species, divided among four suborders and more than 70 families. They range in size from 1–10 millimetres (0.04–0.4 in) in length.
Paraneoptera or Acercaria is a superorder of insects which includes lice, thrips, and hemipterans, the true bugs. It also includes the extinct order Permopsocida, known from fossils dating from the Early Permian to the mid-Cretaceous.
Prionoglarididae is a family of the order Psocodea that are barklice characterized by the reduction or simplification of the lacinia in adults and the specialised form of the male genitalia. It contains the only known genus of animals, Neotrogla, where females possess a penis-like organ and take on typical male sex roles.
Epipsocetae is an infraorder of psocids in the order Psocodea. There are about 5 families and more than 480 described species in Epipsocetae.
Paracaeciliidae is a family of bark lice in the order Psocodea. There are about 5 genera and more than 100 described species in Paracaeciliidae.
Spurostigmatidae is a family of lice in the order Psocodea. There is at least one genus, Spurostigma, in Spurostigmatidae.
