See text Trogiomorpha is one of the three major suborders of barklice, booklice, and parasitic lice in the order Psocodea (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 the earliest diverging of the three suborders, and retains the most primitive characteristics.

[7] The cladogram below shows the position of Trogiomorpha within Psocodea:[1] Phthiraptera Liposcelididae Pachytroctidae Sphaeropsocidae Amphientometae Psocomorpha Atropetae Psyllipsocetae Prionoglaridetae (paraphyletic) Trogiomorpha contains 3 infraorders and 5 extant (living) families, as well as three identified extinct families: This Psocoptera-related article is a stub.

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