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Troctomorpha; Temporal range: Late Jurassic–Present PreꞒ Ꞓ O S D C P T J K Pg N
	Burmacompsocus perreaui (Compsocidae)
	Liposcelis (Liposcelididae)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Psocodea
Suborder:	Troctomorpha; Roesler, 1944
Infraorders
	Amphientometae Amphientomidae; Compsocidae; †Electrentomidae; Manicapsocidae; Musapsocidae; Protroctopsocidae; Troctopsocidae; ; Nanopsocetae Liposcelidae; Pachytroctidae; Sphaeropsocidae; Phthiraptera (lice); ;

Troctomorpha is one of the three major suborders of Psocodea (formerly Psocoptera)^[1]^[2](barklice, booklice, and parasitic lice), alongside Psocomorpha and Trogiomorpha. There are more than 30 families and 5,800 described species in Troctomorpha.^[3]^[4]^[1] The order includes parasitic lice, which are most closely related to the booklice family Liposcelididae.

Cladogram

Cladogram showing the position of Troctomorpha within Psocodea:^[5]

Fossil record

The oldest record of the suborder is suggested to be Paramesopsocus adibi, known from the Late Jurassic Karabastau Formation of Kazakhstan.^[6]^[7]

Classification

Troctomorpha contains the following subgroups:^[1]

Infraorder: Amphientometae
- Family: Amphientomidae Enderlein, 1903 (tropical barklice)
- Family: Compsocidae Mockford, 1967
- Family: Electrentomidae Enderlein, 1911
- Family: Manicapsocidae Mockford, 1967
- Family: Musapsocidae Mockford, 1967
- Family: Protroctopsocidae Smithers, 1972
- Family: Troctopsocidae Mockford, 1967
Infraorder: Nanopsocetae
- Family: Liposcelididae Broadhead, 1950 (booklice)
- Family: Pachytroctidae Enderlein, 1904 (thick barklice)
- Family: Sphaeropsocidae Menon, 1941
- Parvorder: Phthiraptera
  - Superfamily: Amblycera
    - Family: Ancistronidae
    - Family: Boopiidae Mjoberg, 1910
    - Family: Colpocephalidae Eichler, 1937
    - Family: Gliricolidae
    - Family: Gyropidae Kellogg, 1896
    - Family: Laemobothriidae Mjoberg, 1910
    - Family: Menoponidae Mjoberg, 1910 (chicken body lice)
    - Family: Pseudomenoponidae Mjoberg, 1910
    - Family: Ricinidae Neumann, 1890
    - Family: Somaphantidae Eichler, 1941
    - Family: Trimenoponidae
    - Family: Trinotonidae Eichler, 1941
  - Superfamily: Anoplura
    - Family: Echinophthiriidae Enderlein, 1904 (seal lice)
    - Family: Enderleinellidae Ewing, 1929
    - Family: Haematopinidae Enderlein, 1904 (ungulate lice)
    - Family: Hamophthiriidae Johnson, 1969
    - Family: Hoplopleuridae Ewing, 1929 (armoured lice)
    - Family: Hybothiridae Ewing, 1929
    - Family: Linognathidae Webb, 1946 (pale lice)
    - Family: Microthoraciidae Kim & Lugwig, 1978
    - Family: Neolinognathidae Fahrenholz, 1936
    - Family: Pecaroecidae Kéler, 1963
    - Family: Pedicinidae Enderlein, 1904
    - Family: Pediculidae Leach, 1817 (body lice, head lice)
    - Family: Polyplacidae Fahrenholz, 1912 (spiny rat lice)
    - Family: Pthiridae Ewing, 1929 (crab lice or pubic lice)
    - Family: Ratemiidae Kim & Lugwig, 1978
  - Superfamily: Ischnocera (paraphyletic)
    - Family: Bovicolidae
    - Family: Dasyonygidae
    - Family: Goniodidae
    - Family: Heptapsogasteridae
    - Family: Lipeuridae
    - Family: Philopteridae Nitzsch, 1818 (paraphyletic)
    - Family: Trichodectidae
    - Family: Trichophilopteridae
  - Superfamily: Rhynchophthirina
    - Family: Haematomyzidae Enderlein, 1904