Trogiomorpha
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 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: