Trogiomorpha is one of the three major suborders of barklice, booklice, and parasitic lice in the orderPsocodea (formerly Psocoptera),[2][3] alongside Troctomorpha and Psocomorpha. There are about 8 families and more than 430 described species in Trogiomorpha.[4][5][6] Trogiomorpha is widely agreed to be earliest diverging of the three suborders, and retains the most primitive characteristics.[7]
Lyal, Ch H. C. (1985). "Phylogeny and classification of the Psocodea, with particular reference to the lice (Psocodea: Phthiraptera)". Systematic Entomology. 10 (2): 145–165. doi:10.1111/j.1365-3113.1985.tb00525.x. ISSN0307-6970.