Psocodea
Guides
Aaroniella
loving barklice
Aaroniella is a genus of barklice in the family Philotarsidae, commonly referred to as 'loving barklice.' The genus contains more than 40 described species and was established by Mockford in 1951. Species within this genus show variation in reproductive strategies, including documented parthenogenesis in at least one species.
Aaroniella badonneli
loving barklouse
Aaroniella badonneli is a species of barklouse in the family Philotarsidae. It is a small psocopteran with sexual dimorphism in body size. The species is named after French entomologist André Badonnel. It has a transcontinental distribution spanning Europe, northern Asia, and North America.
Anomopsocus
Anomopsocus is a genus of barklice (Psocodea: Lachesillidae) established by Roesler in 1940. The genus contains at least two described species: Anomopsocus amabilis (Walsh, 1862) and Anomopsocus radiolosus (Roesler, 1940). These insects are small, winged psocopterans associated with bark and lichen habitats.
Anomopsocus amabilis
fateful barklouse
Anomopsocus amabilis is a species of barklouse in the family Lachesillidae, first described by Walsh in 1862. The species is known from North America, with records from the United States and Canada. Like other members of its family, it is associated with bark habitats. The specific epithet "amabilis" (Latin for "lovely" or "pleasing") was given by the original describer. As a member of the Psocodea, it belongs to a group of insects commonly known as barklice or booklice, though the common name "fateful barklouse" has been applied to this species.
Archipsocidae
Ancient Barklice
Archipsocidae is a family of barklice in the order Psocodea, containing approximately 80 species across five genera. Members are distinguished by reduced wing venation and small body size (1.2–1.8 mm). The family exhibits alary polymorphism, where individuals within a population may have different wing morphologies. Some species are known to be viviparous, an uncommon reproductive mode among barklice.
Archipsocus floridanus
ancient barklouse
Archipsocus floridanus is a species of barklouse in the family Archipsocidae, first described by Mockford in 1953. It is one of several species in the genus Archipsocus, a group sometimes referred to as "ancient barklice" within the order Psocodea. The species has been recorded across a broad geographic range spanning North, Central, and South America. Like other members of its family, it is presumed to inhabit bark and lichen microhabitats, though specific ecological details remain poorly documented.
Asiopsocidae
Asiopsocidae is a family of barklice (Psocodea) established in 1976, comprising 14 known species across three genera: Asiopsocus, Notiopsocus, and Pronotiopsocus. The family belongs to the infraorder Caeciliusetae. At least one species from each genus has been documented in the United States, though the family's center of diversity appears to be Asia.
Asiopsocus sonorensis
Asiopsocus sonorensis is a species of barklouse in the family Asiopsocidae, described by Mockford and García-Aldrete in 1976. It represents one of the few documented species in this small family of Psocodea. The species has been recorded from both North America and Central America, with the specific epithet 'sonorensis' suggesting a type locality association with the Sonoran region. A 1991 publication in The Southwestern Naturalist provided a new distributional record, augmented morphological description, and notes on its reproductive biology, indicating continued scientific interest in this poorly known taxon.
Atropetae
Atropetae is an infraorder of small insects within the suborder Trogiomorpha of Psocodea, the order containing barklice, booklice, and parasitic lice. It was established by Pearman in 1936. Members of Atropetae are part of the earliest-diverging lineage of Psocodea, retaining primitive characteristics compared to other groups. The infraorder includes families of primarily free-living psocids found in cryptic habitats.
Atropsocus atratus
Atropsocus atratus is a species of barklouse in the family Psocidae, originally described as Psocus atratus by Aaron in 1883. The species is known from the United States and is part of the diverse Psocodea order, which includes booklice, barklice, and parasitic lice. As a member of the Psocidae family, it is likely associated with bark, leaf litter, or other decaying organic matter where these insects commonly feed on microflora. The genus Atropsocus contains multiple species distributed primarily in North America.
Badonnelia
Badonnelia is a genus of small psocopterans in the family Sphaeropsocidae. These insects are part of the order Psocodea, which includes booklice, barklice, and parasitic lice. The genus was established by Pearman in 1953. Members of this family are characterized by their rounded, compact body form and reduced wing venation.
Belaphotroctes
Belaphotroctes is a genus of small psocids (barklice and booklice) in the family Liposcelididae. Members of this genus are minute, dorsoventrally flattened insects adapted to living in concealed microhabitats such as leaf litter, bark crevices, and stored products. The genus was established by Roesler in 1943 and has been recorded from both the New World (USA, Mexico, Jamaica) and Africa (Angola, Togo).
Bertkauia
Bertkauia is a genus of barklice in the family Epipsocidae, established by Kolbe in 1882. The genus contains at least three described species, including the type species Bertkauia lucifuga (Rambur, 1842) and two species described by Chapman in 1930. Members of this genus are small, winged insects belonging to the order Psocodea, which includes booklice and barklice. The genus has been recorded across parts of Europe and North America.
Bertkauia crosbyana
elliptical barklouse
Bertkauia crosbyana is a species of elliptical barklouse described by Chapman in 1930. It belongs to the family Epipsocidae, a group of free-living barklice within the order Psocodea. The species has been documented across a broad geographic range spanning North and Central America. As a member of the Epipsocidae, it is associated with bark and lichen habitats typical of this family.
Bertkauia lepicidinaria
elliptical barklouse
Bertkauia lepicidinaria is a species of elliptical barklouse in the family Epipsocidae, first described by Chapman in 1930. It is found in North America, with records from the United States and Canada. Like other members of its family, it belongs to the order Psocodea, which includes barklice and booklice. The species is documented through limited observations, with only 5 records on iNaturalist as of the available data.
Blaste garciorum
common barklouse
Blaste garciorum is a species of barklouse in the family Psocidae, described by Mockford in 1984. It is distributed across Central America and North America, including Mexico. As a member of Psocidae, it is part of a group of small, soft-bodied insects commonly known as barklice or booklice that inhabit tree bark and other surfaces. The species epithet 'garciorum' honors individuals with the surname García, though the specific honorees are not documented in available sources.
Blaste quieta
common barklouse
Blaste quieta is a species of barklouse in the family Psocidae, first described by Hagen in 1861. It is found in Central America and North America. Barklice in this family are typically associated with tree bark and other woody substrates, where they feed on microflora including algae, lichens, and organic debris.
Blastopsocus variabilis
common barklouse
Blastopsocus variabilis is a species of barklouse in the family Psocidae. It has been documented in Central America and North America, with distribution records from the United States and Panama. As a member of Psocidae, it belongs to a group of small, soft-bodied insects commonly found on bark, foliage, and other surfaces. The species was described by Aaron in 1883.
Caeciliusidae
Lizard Barklice
Caeciliusidae is a family of barklice in the order Psocodea, comprising at least 40 genera and approximately 650 described species. Members are small, soft-bodied insects commonly found on vegetation and bark. The family was originally named Caeciliidae but was renamed due to homonymy with an amphibian family. The subfamily Paracaeciliinae has been elevated to family rank as Paracaeciliidae.
Cerobasis
granary booklice
Cerobasis is a genus of granary booklice in the family Trogiidae, established by Kolbe in 1882. The genus contains at least 30 described species distributed across multiple continents. Members of this genus are small, wingless insects associated with stored products and dry organic materials.
Clinopsocus
Clinopsocus is a genus of barklice in the family Elipsocidae, first described by New in 1972. It belongs to the subfamily Pseudopsocinae within the diverse order Psocodea. The genus is known from Australia, with very few documented observations. Like other members of Elipsocidae, species in this genus are small, soft-bodied insects associated with bark and lichen habitats.
Clinopsocus nigrescens
Clinopsocus nigrescens is a species of barklouse in the family Elipsocidae, described by Mockford in 2018. It belongs to the order Psocodea, a group of small, often overlooked insects that includes both parasitic lice and free-living barklice and booklice. The genus Clinopsocus is classified within the subfamily Pseudopsocinae. As a recently described species, detailed biological information remains limited.
Cuneopalpus
damp barklice
Cuneopalpus is a genus of damp barklice in the family Elipsocidae, erected by French entomologist André Badonnel in 1943. The genus contains a single described species, Cuneopalpus cyanops, which was originally described as Eclipsocus cyanops in 1876 before being reclassified. Members of this genus are found across a broad geographic range spanning Europe, northern Asia, and North America.
Cuneopalpus cyanops
Cuneopalpus cyanops is a species of damp barklouse in the family Elipsocidae. It is the sole described species in its genus. The species has a broad distribution across Europe, northern Asia, and North America. Adults are orange in coloration.
Dasydemellidae
Shaggy Barklice
Dasydemellidae is a family of barklice within the order Psocodea, comprising approximately 30 described species. Members of this family are classified in the infraorder Caeciliusetae and are characterized by their shaggy or hairy appearance, which distinguishes them from other barklice families. The family exhibits a primarily Neotropical and Oriental distribution pattern, with documented occurrences in the Americas and Asia.
Echmepteryx hageni
scaly-winged barklouse
Echmepteryx hageni is a species of scaly-winged barklouse in the family Lepidopsocidae, first described by Packard in 1870. It is one of approximately 70 species in the genus Echmepteryx. The species is known from North America, with records from the United States and Canada including Vermont. As a member of the Lepidopsocidae, it possesses the characteristic broad, scaled wings that give the family its common name.
Echmepteryx intermedia
scaly-winged barklouse
Echmepteryx intermedia is a species of scaly-winged barklouse in the family Lepidopsocidae, described by Mockford in 1974. It belongs to a group of small, cryptic insects characterized by scales covering their wings and body. The species has been documented across a broad geographic range spanning the Caribbean, Central America, and North America.
Ectopsocus californicus
outer barklouse
Ectopsocus californicus is a species of outer barklouse in the family Ectopsocidae, first described by Banks in 1903. Originally described as Peripsocus californicus, it has since been reclassified to the genus Ectopsocus. The species exhibits a broad geographic distribution spanning multiple continents including North America, Central America, and Australia, with records also from New Zealand. As an outer barklouse, it inhabits the exterior surfaces of tree bark rather than living beneath it.
Ectopsocus meridionalis
Ectopsocus meridionalis is a species of outer barklouse in the family Ectopsocidae. It has been recorded across an exceptionally broad geographic range spanning six continents, including Africa, Europe, Asia, the Americas, and Oceania. The species was described by Ribaga in 1904. Its widespread distribution suggests either high dispersal capability or cryptic species diversity, though specific ecological studies remain limited.
Ectopsocus richardsi
outer barklouse
Ectopsocus richardsi is a species of outer barklouse in the family Ectopsocidae, first described by Pearman in 1929. The species exhibits an exceptionally broad geographic distribution spanning six continents, with documented occurrences across Africa, Australia, Europe, Northern Asia, Central America, North America, Oceania, South America, and Southern Asia. This cosmopolitan range is notable among barklice and suggests either high dispersal capability or cryptic species status. The species is classified within the order Psocodea, which includes both parasitic lice and free-living barklice.
Ectopsocus strauchi
outer barklouse
Ectopsocus strauchi is a species of outer barklouse in the family Ectopsocidae. It has a remarkably broad global distribution spanning six continents. The species was described by Enderlein in 1906. As an outer barklouse, it inhabits the surface of tree bark rather than living beneath it.
Elipsocidae
Damp Barklice
Elipsocidae is a family of barklice in the order Psocodea, containing approximately 130 species across more than 30 genera. Members are characterized by a free areola postica in the wing venation, and many species are apterous (wingless). The family exhibits diverse ecological adaptations, including crypsis and substrate-specific habitat selection in some species, and potentially phragmotic behavior in others.
Elipsocus hyalinus
Elipsocus hyalinus is a species of barklouse in the family Elipsocidae, characterized by yellowish-black coloration. It is widely distributed across Europe, with additional records from North America, North Africa, and parts of Asia. The species feeds on diverse plant material including fruits, berries, and foliage of numerous tree and shrub species.
Elipsocus obscurus
Elipsocus obscurus is a species of damp barklouse in the family Elipsocidae, described by Mockford in 1980. It is distributed across Central America and North America, including the United States and Mexico. As a member of Psocodea, it belongs to a group of small, often overlooked insects commonly associated with moist habitats.
Embidopsocus
booklice
Embidopsocus is a genus of booklice (Psocodea: Liposcelididae) first described by Hagen in 1866. The genus contains more than 40 described species distributed across multiple continents. Members are small, wingless insects commonly associated with stored products, leaf litter, and other organic debris. They are part of the broader group of psocids often referred to as booklice or barklice, though Liposcelididae are more frequently found in dry, disturbed habitats than their bark-dwelling relatives.
Graphopsocus
Graphopsocus is a genus of barklice in the family Stenopsocidae, order Psocodea. These small insects are characterized by their flattened bodies and broad, rounded wings that are held roof-like over the body when at rest. The genus includes both native and introduced species, with at least one species, Graphopsocus cruciatus, having established populations outside its native European range. Barklice in this genus feed on microflora such as algae, lichens, and fungi growing on plant surfaces.
Hemipsocidae
Leaf Litter Barklice
Hemipsocidae is a family of small insects in the order Psocodea, commonly known as leaf litter barklice. The family contains 24 species across three genera: Anopistoscena, Hemipsocus, and Metahemipsocus. Members are distinguished by specific wing venation characters including the areola postica joined to the M vein by a crossvein and a two-branched M vein.
Hemipsocus africanus
Hemipsocus africanus is a species of barklouse in the family Hemipsocidae, first described by Enderlein in 1907. It belongs to the order Psocodea, which encompasses both barklice and true lice. The species has been documented across a broad geographic range spanning sub-Saharan Africa, parts of Central America, and several island systems including the Krakatau Islands and Seychelles. Its wide distribution suggests either natural dispersal capabilities or human-mediated transport, though specific mechanisms remain undocumented.
Hemipsocus chloroticus
leaf litter barklouse
Hemipsocus chloroticus is a species of leaf litter barklouse in the family Hemipsocidae, first described by Hagen in 1858. It has an exceptionally broad geographic distribution spanning Africa, Central America, North America, Oceania, and Southern Asia. The species belongs to the order Psocodea, a group formerly split between barklice/booklice (Psocoptera) and parasitic lice (Phthiraptera). As a member of Hemipsocidae, it is associated with leaf litter habitats rather than living foliage.
Heterocaecilius
Heterocaecilius is a genus of barklice in the family Pseudocaeciliidae, established by Lee and Thornton in 1967. Members of this genus belong to the order Psocodea, a group of small, often overlooked insects commonly found on vegetation and bark. The genus has been recorded from multiple regions including the United States, Japan, and Malaysia.
Indiopsocus
common barklice
Indiopsocus is a genus of common barklice in the family Psocidae, containing more than 30 described species. These small insects are found primarily in the Americas, with records from the United States through Central America. As members of Psocidae, they inhabit terrestrial environments where they feed on organic detritus. The genus was established by Mockford in 1974.
Indiopsocus campestris
common barklouse
Indiopsocus campestris is a species of barklouse in the family Psocidae, originally described by Aaron in 1886. It is found in the Caribbean Sea and North America. Barklice are small, soft-bodied insects that are easily mistaken for planthoppers or tiny moths but possess chewing mouthparts rather than piercing-sucking or siphoning mouthparts.
Indiopsocus lanceolatus
Indiopsocus lanceolatus is a species of barklouse in the family Psocidae, described by Mockford and Young in 2015. The species belongs to the genus Indiopsocus, which comprises common barklice found in various habitats across North America. As a member of Psocodea, it possesses chewing mouthparts and is typically associated with dead plant material, bark, and leaf litter.
Indiopsocus texanus
common barklouse
Indiopsocus texanus is a species of barklouse in the family Psocidae, first described by Aaron in 1886. It belongs to the order Psocodea, which includes barklice and booklice. The species has been recorded from Texas in the United States and Cuba in the Caribbean. Like other members of its family, it is likely associated with bark, lichens, and other organic substrates in its environment.
Lachesilla contraforcepeta
fateful barklouse
Lachesilla contraforcepeta is a species of barklouse in the family Lachesillidae, described by Chapman in 1930. It belongs to the order Psocodea, a group that includes booklice, barklice, and parasitic lice. The species has been documented in North America, specifically in the United States and Canada. Like other members of its family, it is likely associated with dead or decaying plant material.
Lachesilla dona
fateful barklouse
Lachesilla dona is a species of barklouse in the family Lachesillidae, described by Sommerman in 1946. It belongs to the order Psocodea, a group of small, soft-bodied insects commonly known as barklice or booklice. The species has been recorded in both Central America and North America.
Lachesilla floridana
Lachesilla floridana is a species of barklouse in the family Lachesillidae, described by García-Aldrete in 1999. It belongs to the order Psocodea, a group of small, often overlooked insects that includes barklice and booklice. The species is known from North America, though specific details about its biology and ecology remain limited in published literature.
Lachesilla forcepeta
fateful barklouse
Lachesilla forcepeta is a species of barklouse described by Chapman in 1930. It belongs to the family Lachesillidae, a group of small, soft-bodied insects commonly known as fateful barklice. The species is recorded from both Central America and North America. Barklice in this family are generally found in association with dead plant material and bark.
Lachesilla major
fateful barklouse
Lachesilla major is a species of barklouse in the family Lachesillidae, first described by Chapman in 1930. It belongs to the order Psocodea, a group that includes booklice, barklice, and parasitic lice. The species is found in North America, with confirmed records from the United States. Like other members of its family, it is likely associated with bark or dead plant material, though specific ecological details remain poorly documented.
Lachesilla pacifica
Lachesilla pacifica is a species of barklouse in the family Lachesillidae, first described by Chapman in 1930. It belongs to the order Psocodea, a group of small, soft-bodied insects commonly known as psocids or booklice. The species has been recorded across a broad geographic range spanning North America, Europe, and parts of Middle America.
Lachesilla pallida
Lachesilla pallida is a species of fateful barklouse in the family Lachesillidae. It is known from North America, with records from the United States and Canada. As a member of the order Psocodea, it is a small, winged or wingless insect associated with bark and lichen habitats. The species was described by Chapman in 1930.
Lachesilla penta
fateful barklouse
Lachesilla penta is a species of barklouse in the family Lachesillidae, first described by Sommerman in 1946. It belongs to the order Psocodea, a group of small, soft-bodied insects commonly known as barklice or booklice. The species has been documented in parts of Central America and North America, including the United States and Mexico. Like other members of its family, it is likely associated with bark and dead plant material in forested environments.
Lachesilla rufa
fateful barklouse
Lachesilla rufa is a species of barklouse in the family Lachesillidae, originally described by Walsh in 1863 as Psocus rufus. It is one of numerous species in the genus Lachesilla, which comprises small, often overlooked insects commonly known as barklice or booklice. The species is known from North America, though detailed biological information remains limited.
Lachesilla tropica
Lachesilla tropica is a species of barklouse in the family Lachesillidae, described by García-Aldrete in 1982. The species belongs to the order Psocodea, a group of small insects commonly known as barklice or booklice. It has been recorded from the Caribbean Sea region, Central America, and North America, with specific distribution records from Mexico. As a member of Lachesillidae, it is part of a family of free-living barklice typically associated with vegetation and bark habitats.
Lachesillidae
Fateful Barklice
Lachesillidae is a family of barklice within the order Psocodea (formerly Psocoptera), suborder Psocomorpha. The family contains more than 400 species across 26 genera, with the majority belonging to the genus Lachesilla. Members are characterized by distinctive wing venation featuring a rounded, free areola postica, and males exhibit diverse sclerotized genitalic structures.
Lepinotus inquilinus
granary booklouse
Lepinotus inquilinus is a species of granary booklouse in the family Trogiidae. It has a broad cosmopolitan distribution spanning Africa, Australia, Europe, Northern Asia (excluding China), Central America, North America, Oceania, and Southern Asia. The species has been documented in the Azores archipelago (Pico, São Miguel, and Terceira islands). As a member of the granary booklice group, it is associated with stored products and human-modified environments.
Lepinotus reticulatus
reticulate-winged trogiid, reticulate-winged booklouse, granary booklouse
Lepinotus reticulatus is a species of granary booklouse in the family Trogiidae. It is one of the most widely distributed psocids, occurring across six continents in association with stored grain and dry organic materials. The species is frequently encountered in anthropogenic environments, particularly granaries, warehouses, and food storage facilities. Its common name refers to the distinctive reticulate wing venation pattern visible in winged morphs.
Lichenomima
mouse-like barklice
Lichenomima is a genus of psocopterans in the family Myopsocidae, commonly referred to as 'mouse-like barklice.' The genus was established by Enderlein in 1910 and contains more than 40 described species. These insects are part of the diverse barklice fauna associated with tree bark and lichen habitats.
Lichenomima lugens
mouse-like barklouse
Lichenomima lugens is a species of barklouse in the family Myopsocidae, originally described by Hagen in 1861 as Psocus lugens. It belongs to a group commonly referred to as mouse-like barklice due to their general body form. The species has been documented in North America with records from both the United States and Canada. Like other members of Myopsocidae, it is associated with bark habitats.
Liposcelis hirsutoides
booklouse
Liposcelis hirsutoides is a species of booklouse in the family Liposcelididae. It was described by Mockford in 1978. The species has been documented across a broad geographic range spanning North, Central, and South America. Like other members of the genus Liposcelis, it belongs to the order Psocodea, which includes barklice and parasitic lice.
Liposcelis nigra
booklouse
Liposcelis nigra is a minute species of booklouse in the family Liposcelididae. It belongs to a genus of nearly microscopic insects commonly associated with stored products and household environments. The species was described by Nathan Banks in 1900 and is known from North America.
Liposcelis pallida
Liposcelis pallida is a species of booklice in the family Liposcelididae, described by Mockford in 1978. It belongs to a genus commonly associated with stored products and household environments. The species has been documented in the United States and Mexico.
Liposcelis pearmani
Liposcelis pearmani is a species of booklouse in the family Liposcelididae, described by Lienhard in 1990. It belongs to a genus of small, wingless insects commonly associated with stored products and human dwellings. Like other Liposcelis species, it is likely a pantry pest, though specific details about this particular species are limited in available sources.
Lithoseopsis
barklice
Lithoseopsis is a genus of tropical barklice in the family Amphientomidae, containing approximately 10 described species. The genus was established by Mockford in 1993 and is primarily distributed in tropical regions of the Americas. A 2018 study described the first South American species from Brazil, expanding the known range beyond Central America and the Caribbean. Species are distinguished by forewing pigmentation patterns and details of the spermapore sclerite.
Loensia
barklice
Loensia is a genus of barklice in the family Psocidae, established by Enderlein in 1924. The genus contains more than 30 described species distributed across temperate regions of the Northern Hemisphere. Members are small, soft-bodied insects commonly found on tree bark and in leaf litter.
Loensia conspersa
common barklouse
Loensia conspersa is a species of barklouse in the family Psocidae, first described by Nathan Banks in 1903. It is one of approximately 62 documented observations on iNaturalist, indicating it is a documented but not extensively studied species. As a member of the Psocidae family, it belongs to a group of small, soft-bodied insects commonly known as barklice or booklice, though the specific ecological habits of this species remain poorly documented.
Loensia moesta
common barklouse
Loensia moesta is a species of barklouse in the family Psocidae, first described by Hagen in 1861 under the name Psocus moestus. It is widely distributed across North America, with confirmed records from the United States and Canada. As a member of the order Psocodea, it is part of a group of small, soft-bodied insects commonly known as barklice or booklice. The species is relatively well-documented in entomological collections and citizen science platforms, with over 140 verified observations on iNaturalist.
Maoripsocus
lizard barklice
Maoripsocus is a genus of barklice in the family Caeciliusidae, first described by Robin Tillyard in 1923. The genus comprises at least 21 described species, all commonly referred to as lizard barklice. Members of this genus are small, soft-bodied insects found in the order Psocodea. The genus is classified within the tribe Maoripsocini.
Maoripsocus africanus
lizard barklouse
Maoripsocus africanus is a species of lizard barklouse in the family Caeciliusidae. It was described by Ribaga in 1911. The species has been recorded from multiple continents, including Africa and North America, with specific distribution records from French Guiana, South Africa, USA, Angola, Congo, Mozambique, and Nigeria.
Mesopsocidae
Middle Barklice
Mesopsocidae is a family of barklice within the order Psocodea, suborder Psocomorpha. The family contains over 70 described species and is distinguished by a key morphological feature: a free areola postica in the wing venation. Members are small, soft-bodied insects commonly found in association with vegetation and bark surfaces.
Mesopsocus laticeps
middle barklouse
Mesopsocus laticeps is a species of middle barklouse in the family Mesopsocidae. It is widely distributed across Europe, Northern Asia (excluding China), North America, and Southern Asia. As a member of the order Psocodea, it belongs to a group of insects commonly known as barklice or booklice, though barklice specifically refers to the free-living species found on vegetation and bark rather than the domestic pests.
Neolepolepis
Neolepolepis is a genus of scaly-winged barklice in the family Lepidopsocidae, established by Mockford in 1993. The genus contains at least four described species distributed across the Caribbean and Central America. Members of this genus are characterized by their scale-covered wings, a defining trait of the family Lepidopsocidae. These insects are part of the order Psocodea, which includes barklice, booklice, and parasitic lice.
Neolepolepis occidentalis
Neolepolepis occidentalis is a species of scaly-winged barklouse in the family Lepidopsocidae, described by Mockford in 1955. It is one of approximately seven known species in the genus Neolepolepis. The species is found in North America, with records from the United States and Canada. As a member of the Lepidopsocidae, it possesses the characteristic scaly wings that distinguish this family within the order Psocodea.
Ophiodopelma
Ophiodopelma is a genus of barklice in the family Pseudocaeciliidae, first described by Enderlein in 1908. It belongs to the order Psocodea, a group of small, often overlooked insects commonly known as booklice, barklice, and true lice. The genus is known from Japan, though detailed biological information remains limited. As a member of Pseudocaeciliidae, it is presumed to inhabit bark or foliage environments where these insects typically feed on lichens, algae, or detritus.
Pachytroctes
Pachytroctes is a genus of small, wingless insects in the family Pachytroctidae, order Psocodea. Members of this genus are part of a group formerly known as booklice, now classified within Psocodea alongside barklice and parasitic lice. The genus was established by Enderlein in 1904 and has been recorded across multiple continents including Europe, the Americas, Asia, and Australia.
Peripsocidae
Stout Barklice
Peripsocidae is a family of barklice within the order Psocodea, suborder Psocomorpha. The family contains over 300 species distributed across 12 genera, with many recently described genera closely allied to the type genus Peripsocus. Members are characterized by wing venation lacking an areola postica, a diagnostic feature distinguishing them from related families. The family has a broad geographic distribution spanning the Oriental region, East Africa, Australia, and northern Europe.
Peripsocus alachuae
stout barklouse
Peripsocus alachuae is a species of stout barklouse in the family Peripsocidae, described by Mockford in 1971. It is known from North America, specifically the United States. As a member of Psocodea, it shares characteristics with other barklice, including small size and association with bark or foliage habitats. The species epithet references Alachua County, Florida, where the type specimen was likely collected.
Peripsocus maculosus
stout barklouse
Peripsocus maculosus is a species of barklouse described by Mockford in 1971. It belongs to the family Peripsocidae, a group of small, soft-bodied insects commonly known as stout barklice. The species is known from North America. Barklice in this family are typically found on tree bark and foliage where they feed on organic debris.
Peripsocus minimus
stout barklouse
Peripsocus minimus is a species of stout barklouse in the family Peripsocidae, described by Mockford in 1971. It belongs to the order Psocodea, which includes barklice and booklice. The species has been documented in North America, with confirmed records from the United States. As a member of Peripsocidae, it shares the family characteristic of being a "stout" barklouse, though specific details of its biology remain limited.
Peripsocus unnamed-one
A species of bark louse in the family Peripsocidae. This taxon appears to be an undescribed or informally designated species within the genus Peripsocus, which comprises small, often inconspicuous psocids associated with bark and lichen habitats. Members of this genus are generally characterized by their reduced wing venation and elongate body form.
Philotarsidae
Loving Barklice
Philotarsidae is a family of barklice within the order Psocodea, comprising approximately 150 species across eight recognized genera. The family belongs to the infraorder Philotarsetae and is closely related to Pseudocaeciliidae and Calopsocidae. A revised classification recognizes two subfamilies: Philotarsinae (tribes Philotarsini and Aaroniellini) and Zelandopsocinae. The family has been extensively studied for its systematics, phylogeny, and biogeographic patterns, particularly in relation to plate tectonics and historical fragmentation in the southwest Pacific.
Philotarsus
loving barklice
Philotarsus is a genus of barklice in the family Philotarsidae, containing approximately 18 described species. These insects are commonly known as 'loving barklice,' a name shared with related genera in the family. The genus was established by Kolbe in 1880 and is distributed across parts of North and Central America.
Philotarsus kwakiutl
loving barklouse
Philotarsus kwakiutl is a species of barklouse described by Mockford in 1951. It belongs to the family Philotarsidae, commonly referred to as 'loving barklice.' The species is documented from North America, with occurrence records from the United States and Canada. Available information on this species is limited, with only 8 observations recorded on iNaturalist as of the data source date.
Philotarsus parviceps
Philotarsus parviceps is a species of barklouse in the family Philotarsidae, described by Roesler in 1954. It belongs to the order Psocodea, a group of small insects commonly known as booklice, barklice, and true lice. As a member of the subfamily Philotarsinae, it is part of a lineage of free-living barklice that inhabit vegetation and tree bark rather than parasitic lifestyles. The species has been documented through 152 observations on iNaturalist, indicating it is not uncommon where it occurs, though detailed biological studies remain limited.
Polypsocus corruptus
Corrupt Barklouse
Polypsocus corruptus is a species of barklouse in the family Amphipsocidae, commonly known as the Corrupt Barklouse. It is one of the most frequently observed barklice in North America, with over 2,300 documented records. The species belongs to the group of 'hairy-winged barklice,' characterized by setose wing surfaces. It occurs across a broad geographic range spanning temperate and subtropical regions of North and Central America.
Propsocus pulchripennis
Propsocus pulchripennis is a species of damp barklouse in the family Elipsocidae. It has a remarkably broad cosmopolitan distribution spanning six continents, including Africa, Australia, Europe, the Americas, and Oceania. The species was originally described by Perkins in 1899 under the basionym Stenopsocus pulchripennis. As a member of the damp barklice, it inhabits moist microhabitats associated with bark and decaying wood.
Pseudocaecilius citricola
false lizard barklouse, citrus barklouse
Pseudocaecilius citricola is a species of false lizard barklouse in the family Pseudocaeciliidae. It constructs silken webs on leaf surfaces and deposits egg-batches within these protective structures. The species has a remarkably broad pantropical and subtropical distribution spanning Africa, the Americas, Asia, and Oceania, with records from over 30 countries and island groups. It has been documented on host plants including mango (Mangifera indica) and Cordia collococca in Jamaica.
Pseudorypteryx mexicana
Pseudorypteryx mexicana is a species of trogiomorphan psocid (barklouse) in the family Psyllipsocidae, described by García-Aldrete in 1984. Members of this family are small, wingless insects typically associated with dark, humid microhabitats. The genus Pseudorypteryx is characterized by reduced wing venation and other troglomorphic adaptations. This species occurs in Mexico and the United States.
Psocetae
bark lice
Psocetae is an infraorder of bark lice within the order Psocodea, established by Pearman in 1936. It comprises four families: Hemipsocidae, Myopsocidae, Psilopsocidae, and Psocidae. Members are characterized by distinctive morphological features including an oval head with a median crevice and specialized limb structures.
Pteroxanium
scaly-winged barklice
Pteroxanium is a genus of scaly-winged barklice in the family Lepidopsocidae, first described by Enderlein in 1922. The genus comprises approximately eight described species distributed across multiple continents. Members are characterized by their distinctive scaled wings, a trait that distinguishes them from many other barklice groups. The genus includes species found in both tropical and temperate regions, with records from the Americas, Europe, and insular localities.
Ptycta
barklice
Ptycta is a genus of barklice (family Psocidae) containing more than 150 described species. The genus was redefined based on the morphology of the male terminalia, specifically the forewing venation where veins Rs+M are fused for a short distance. Species occur across multiple continents including Asia, Australia, Africa, and the Americas. The genus is distinguished from the related Copostigma within the Copostigma–Ptycta complex by this wing venation character.
Ptyctini
common barklice
Ptyctini is a tribe of barklice in the family Psocidae, containing approximately 6 genera and at least 20 described species. Members are small, soft-bodied insects commonly found on bark, foliage, and other surfaces. The tribe was established by Mockford in 1993 and includes genera such as Ptycta, Steleops, and Trichadenotecnum.
Reuterella
damp barklice
Reuterella is a genus of damp barklice in the family Elipsocidae, established by Enderlein in 1903. The genus contains at least one described species, R. helvimacula. These insects belong to the order Psocodea, which includes barklice, booklice, and parasitic lice. Members of this genus are associated with moist microhabitats on bark surfaces.
Rhyopsocus bentonae
bird nest barklouse
Rhyopsocus bentonae is a barklouse species in the family Psoquillidae, described by Sommerman in 1956. It is classified within the suborder Trogiomorpha and infraorder Atropetae of the order Psocodea. The species is distributed across Central and North America. As a member of Psoquillidae, it is associated with bird nest habitats.
Rhyopsocus quercus
Rhyopsocus quercus is a species of psocid described by Mockford in 2016, belonging to the family Psoquillidae. The specific epithet 'quercus' suggests an association with oak (Quercus), though the nature of this relationship remains to be fully documented. As a member of the order Psocodea, this species is part of a group of small, often overlooked insects that occur in diverse terrestrial habitats.
Rhyopsocus texanus
Rhyopsocus texanus is a species of barklouse in the family Psoquillidae. It is distributed across Central America and North America, including the United States and Mexico. As a member of the Psocodea order, it belongs to a group of insects commonly associated with decaying organic matter and bird nests. The species was first described by Nathan Banks in 1930.
Soa
Soa is a genus of booklice in the family Lepidopsocidae, order Psocodea. These small, wingless insects inhabit sheltered microhabitats and feed on organic debris. The genus was established by Enderlein in 1904 and is currently accepted in modern classifications.
Sphaeropsocus bicolor
Sphaeropsocus bicolor is a species of booklouse in the family Sphaeropsocidae, described by Mockford in 2013. It belongs to the order Psocodea, a group of small, soft-bodied insects commonly known as barklice and booklice. The genus Sphaeropsocus is part of a family characterized by distinctive morphological features, though specific ecological details for this species remain limited. Only a single observation has been recorded in public databases.
Steleops lichenatus
Steleops lichenatus is a species of barklouse in the family Psocidae, described by Walsh in 1863. It belongs to the genus Steleops, a group of psocids characterized by their association with lichen-covered substrates. The species is known from the United States and represents part of the diverse North American psocid fauna. As with other members of Psocidae, it likely inhabits arboreal or rock-dwelling environments where lichen growth occurs.
Stimulopalpus
tropical barklice
Stimulopalpus is a genus of tropical barklice in the family Amphientomidae, containing at least 30 described species. Members of this genus are small, wingless or weakly winged insects that inhabit tropical environments. They belong to the order Psocodea, which includes barklice, booklice, and parasitic lice. The genus was established by Enderlein in 1906 and represents one of the more species-rich genera within its family.
Tapinella maculata
thick barklouse
Tapinella maculata is a species of thick barklouse in the family Pachytroctidae. It is known from a broad geographic range spanning the Caribbean, Central America, North America, and South America. The species was described by Mockford and Gurney in 1956. As a member of the order Psocodea, it belongs to a group of small, often overlooked insects commonly known as barklice or booklice.
Tapinellinae
Tapinellinae is a subfamily of small, wingless insects within the family Pachytroctidae (order Psocodea). These minute hexapods are part of the diverse assemblage of barklice and booklice relatives, though specific biological details remain poorly documented. The subfamily was established by Enderlein in 1908 and contains genera characterized by particular morphological features of the head and mouthparts. Members are found in association with decaying organic matter in forest habitats.
Trichadenotecnum majus
common barklouse
Trichadenotecnum majus is a species of common barklouse in the family Psocidae. It has been recorded across Europe, Northern Asia (excluding China), and North America. As a member of the barklice, it inhabits environments where it feeds on organic debris such as lichens, algae, and dead plant material on tree bark and rocks.
Trichadenotecnum pardus
Trichadenotecnum pardus is a species of barklouse in the family Psocidae, first described by Badonnel in 1955. It belongs to a genus of common barklice that are frequently encountered on tree bark and foliage. The species has been recorded across multiple continents including North America, South America, Africa, and Asia, suggesting either a wide natural distribution or potential human-mediated dispersal. Like other psocids, it is likely associated with decaying organic matter and microhabitats on vegetation.
Tricholipeurus
Tricholipeurus is a genus of ischnoceran lice in the family Trichodectidae, parasitic on mammals. The genus was established by Bedford in 1929. Species within this genus are ectoparasites of ungulates, with documented host associations including gazelles. At least one species, Tricholipeurus balanicus, has been recorded from the slender-horned gazelle (Gazella leptoceros) in Algeria.
Trichopsocus dalii
Trichopsocus dalii is a small barklouse species in the family Trichopsocidae, characterized by its green coloration. It has been recorded across Europe, North Africa, the Middle East, and North America. The species is associated with a broad range of woody host plants.
Valenzuela
lizard barklice
Valenzuela is a large genus of barklice in the family Caeciliusidae, commonly known as lizard barklice. The genus contains at least 300 described species, making it one of the most diverse genera within Psocodea. Some species are known from Eocene fossils in Poland and Russia, indicating a long evolutionary history. Members of this genus are small, winged or wingless insects that inhabit bark and leaf litter environments.
Valenzuela croesus
lizard barklouse
Valenzuela croesus is a species of barklouse in the family Caeciliusidae, first described by Chapman in 1930. It belongs to the order Psocodea, a group of small, often overlooked insects commonly known as barklice or booklice. The species has been documented in parts of Central America and North America.
Valenzuela distinctus
Valenzuela distinctus is a species of barklouse in the family Caeciliusidae, first described by Mockford in 1966. It belongs to the order Psocodea, a group of small, often overlooked insects commonly found in association with vegetation, bark, and leaf litter. The species has been documented across a broad geographic range including Mexico, the Caribbean, Trinidad, and the Galapagos Islands. As with many psocids, detailed ecological and behavioral studies are limited.
Valenzuela gonostigma
lizard barklouse
Valenzuela gonostigma is a species of lizard barklouse in the family Caeciliusidae. It has been recorded from North America and Southern Asia, with specific distribution records from Japan, the United States, China, and Taiwan. As a member of the order Psocodea, it belongs to a group of small, often overlooked insects commonly known as barklice or booklice.
Valenzuela hyperboreus
lizard barklouse
Valenzuela hyperboreus is a species of lizard barklouse in the family Caeciliusidae, described by Mockford in 1965. It belongs to the order Psocodea, a group of small, often overlooked insects commonly known as barklice or booklice. The species has been recorded in North America, with confirmed observations in the United States.
Valenzuela indicator
lizard barklouse
Valenzuela indicator is a species of lizard barklouse in the family Caeciliusidae, first described by Mockford in 1969. It belongs to the order Psocodea, a group of small insects that includes barklice and booklice. The species has been recorded from the Caribbean region and North America, with specific distribution records from Cuba. Like other members of the genus Valenzuela, it is likely associated with dead leaf litter and bark habitats, though detailed ecological studies remain limited.
Valenzuela lachloosae
Valenzuela lachloosae is a species of barklouse in the family Caeciliusidae, order Psocodea. It is an insect in the class Insecta, phylum Arthropoda. No specific ecological or biological details are documented for this species. The genus Valenzuela contains multiple described species, most of which are poorly known.
Valenzuela manteri
lizard barklouse
Valenzuela manteri is a species of lizard barklouse in the family Caeciliusidae, first described by Sommerman in 1943. It belongs to the order Psocodea, a group of small insects commonly known as barklice or booklice. The species is known from North America, with confirmed records from the United States. As a member of the genus Valenzuela, it is part of a diverse group of barklice associated with dead vegetation and bark habitats.
Valenzuela micanopi
lizard barklouse
Valenzuela micanopi is a species of barklouse in the family Caeciliusidae, first described by Mockford in 1965. It belongs to the order Psocodea, a group of small insects commonly found on vegetation, bark, and leaf litter. The species has been documented in the Caribbean Sea region and North America. As a member of the Caeciliusidae family, it is part of a diverse group of barklice that inhabit forested and vegetated environments.
Valenzuela nadleri
Valenzuela nadleri is a species of lizard barklouse in the family Caeciliusidae, described by Mockford in 1966. It is native to North America, with confirmed records from the United States. Like other members of the genus Valenzuela, it is a small, winged barklouse that inhabits bark and lichen microhabitats. The specific epithet honors nematologist Steve Nadler, professor and chair of the UC Davis Department of Entomology and Nematology.
Valenzuela perplexus
lizard barklouse
Valenzuela perplexus is a species of lizard barklouse in the family Caeciliusidae, a group of small, winged insects commonly associated with bark and foliage habitats. The species was described by Chapman in 1930 and is distributed across Central America and North America, with records from Mexico. Like other members of the genus Valenzuela, it is likely associated with dead leaf and bark microhabitats. The specific epithet "perplexus" suggests taxonomic complexity in its original description.
Valenzuela pinicola
lizard barklouse
Valenzuela pinicola is a species of lizard barklouse described by Banks in 1903. It belongs to the family Caeciliusidae, a group of small, often overlooked insects commonly known as barklice or booklice. The species is known from North America, with documented occurrences in the United States and Canada.
Valenzuela posticus
lizard barklouse
Valenzuela posticus is a species of barklouse in the family Caeciliusidae, commonly known as the lizard barklouse. It was described by Banks in 1914 and is known to occur in North America. As a member of the order Psocodea, it belongs to a group of small, often overlooked insects that inhabit bark, leaf litter, and similar microhabitats. The species has been documented in at least 28 observations on iNaturalist.
Valenzuela tamiami
Valenzuela tamiami is a species of barklouse in the family Caeciliusidae, described by Mockford in 1965. It belongs to the order Psocodea, a group of small, often overlooked insects commonly known as barklice or booklice. The species has been recorded in Cuba and North America, with extremely limited observational data.
Xanthocaecilius
lizard barklice
Xanthocaecilius is a genus of lizard barklice established by Mockford in 1989. The genus contains at least two described species: Xanthocaecilius quillayute (Chapman, 1930) and Xanthocaecilius sommermanae (Mockford, 1955). These insects belong to the order Psocodea, a group that includes barklice, booklice, and parasitic lice. The genus has been recorded from Mexico and is part of the family Paracaeciliidae (sometimes referenced as Caeciliusidae in older literature).