Trogiomorpha is one of the three major suborders of barklice, booklice, and parasitic lice in the order Psocodea (formerly Psocoptera), alongside Troctomorpha and Psocomorpha. There are about 8 families and more than 430 described species in Trogiomorpha. Trogiomorpha is widely agreed to be the earliest diverging of the three suborders, and retains the most primitive characteristics. Internal phylogeny Here is a cladogram showing the phylogeny of Psocodea, showing the position of Trogiomorpha: Families Psocomorpha contains 3 infraorders and 5 extant (living) families, as well as three identified extinct families: Atropetae Archaeatropidae Baz & Ortuño, 2000 Empheriidae Baz & Ortuño, 2000 Lepidopsocidae Enderlein, 1903 (scaly-winged barklice) Psoquillidae Lienhard & Smithers, 2002 (bird nest barklice) Trogiidae Roesler, 1944 (granary booklice) Psyllipsocetae Psyllipsocidae Lienhard & Smithers, 2002 (cave barklice) Prionoglaridetae (paraphyletic) Prionoglarididae Azar, Huang & Nel, 2017 (large-winged psocids) Unplaced: Cormopsocidae Yoshizawa & Lienhard, 2020 References Further reading Psocoptera Insect suborders Psocodea