Troctomorpha is one of the three major suborders of Psocodea (formerly Psocoptera)(barklice, booklice, and parasitic lice), alongside Psocomorpha and Trogiomorpha. There are more than 30 families and 5,800 described species in Troctomorpha. The order includes parasitic lice, which are most closely related to the booklice family Liposcelididae. Cladogram Cladogram showing the position of Troctomorpha within Psocodea: Fossil record The oldest record of the suborder is suggested to be Paramesopsocus adibi, known from the Late Jurassic Karabastau Formation of Kazakhstan. Classification Troctomorpha contains the following subgroups: 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: Rhyncophthirina Family: Haematomyzidae Enderlein, 1904 References Further reading Insect suborders Psocodea