Trogiomorpha is one of the three major suborders of barklice, booklice, and parasitic lice in the order Psocodea, 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.
Troctomorpha is one of the three major suborders of Psocodea (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.
Compsocidae is a family of Psocodea belonging to the suborder Troctomorpha. The family comprises two extant species in two genera, both found in Mesoamerica. Compsocus elegans is found in Mexico and Central America, while Electrentomopsis variegata is found in Mexico. The antennae of each species have 13 or 14 segments. Two extinct genera, Burmacompsocus and Paraelectrentomopsis are known from the Cenomanian aged Burmese amber of Myanmar and Albian aged Spanish amber.
Liposcelididae is a family of booklice of the order Psocodea, belonging to the suborder Troctomorpha. Members of this family are small and flattened, and often wingless. Mesothorax and metathorax fused in wingless forms.
Sphaeropsocidae is a family of Psocodea, belonging to the suborder Troctomorpha. Females of this family have reduced, beetle-like elytra, and lack hindwings, with males have either small or absent wings. The family comprises 22 known species in eight genera.
Prionoglarididae is a family of the order Psocodea that are barklice characterized by the reduction or simplification of the lacinia in adults and the specialised form of the male genitalia. It contains the only known genus of animals, Neotrogla, where females possess a penis-like organ and take on typical male sex roles.
Spathiopterygidae is an extinct family of small parasitic wasps, known from the Cretaceous of Laurasia and Northern Gondwana. They are suggested to be members of Diaprioidea, in part due to their similarly reduced wing venation. Some members of the group reduced or lost the hindwings entirely.
Psyllipsocidae is a family of cave barklice in the order Psocodea. There are about 7 genera and more than 70 described species in Psyllipsocidae.
Psoquillidae is a family of bird nest barklice in the order Psocodea. There are about 8 genera and more than 30 described species in Psoquillidae.
Psyllipsocus is a genus of cave barklice in the family Psyllipsocidae. There are more than 50 described species in Psyllipsocus.
Electrentomidae is an extinct family of barklice, booklice, and parasitic lice in the order Psocodea. There are about six genera and seven described species in Electrentomidae. The family was synonymsed with the extant family Manicapsocidae in 2003 without discussion, with a prior proposal in 1972, but Azar et al., 2017, stated that "we consider herein [Electrentomidae and Manicapsocidae] apart, because a cladistic phylogenetic analysis is needed prior to taking such important decision for these groups."
Amphientometae is an infraorder of psocids, one of two major division of the Troctomorpha within the order Psocodea. There are about 7 families and at least 230 described species in Amphientometae.
2018 in paleoentomology is a list of new fossil insect taxa that were described during the year 2018, as well as other significant discoveries and events related to paleoentomology that were scheduled to occur during the year.
Burmese amber is fossil resin dating to the early Late Cretaceous Cenomanian age recovered from deposits in the Hukawng Valley of northern Myanmar. It is known for being one of the most diverse Cretaceous age amber paleobiotas, containing rich arthropod fossils, along with uncommon vertebrate fossils and even rare marine inclusions. A mostly complete list of all taxa described up until 2018 can be found in Ross 2018; its supplement Ross 2019b covers most of 2019.
Mimarachnidae is an extinct family of planthoppers known from the Cretaceous period. Their name is derived from spots on the wings of the first described genera, Mimarachne and Saltissus, being suggestive of spider mimicry, but these characters are not distinctive for the family as a whole. The family is characterised by "simplified venation and setigerous metatibial pecten and hind leg armature". as well as "rounded anterior margin of pronotum, double carination of pronotum and mesonotum"
Yuripopovinidae is an extinct family of Coreoidea Hemipteran true bugs. Member species are known from the Early Cretaceous and early Late Cretaceous of Asia and northern Gondwana. Among the distinguishing characters are "the hemelytral costal vein apically much thickened and pterostigma-like, the corium with two large cells separated by one longitudinal straight vein." Dehiscensicoridae, described from the Yixian Formation of China has been deemed a junior synonym of Yuripopovinidae per Du et al. (2019). The family was named after Russian paleoentomologist Yuri Alexandrovich Popov.
Dipteromantispidae is an extinct family of neuropterans known from the Cretaceous period. Unlike other neuropterans, the family possesses only a single set of fully developed forewings, with the hindwings reduced to haltere-like structures. They are generally small in size and possess raptorial forelegs. They are considered to belong to Mantispoidea, with an uncertain position within the clade. Some authors have suggested that they represent a subgroup of Mantispidae, and should instead be referred to as the subfamily Dipteromantispinae within that family.
Archaeatropidae is an extinct family of Psocoptera in the suborder Trogiomorpha.
Empheriidae is an extinct family of Psocoptera in the suborder Trogiomorpha.
Cormopsocidae is an extinct family of Psocodea. All currently known members are from the mid-Cretaceous Burmese amber of Myanmar. The family is considered either to be the earliest diverging group of the suborder Trogiomorpha, or the sister group to all other psocids, and retains many primitive characteristics.
