Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Subphylum Chelicerata
- Subphylum Crustacea
- Subphylum Hexapoda
- Class Collembola
- Class Diplura
- Class Entognatha accepted as Hexapoda
- Class Insecta
- Order Alienoptera † accepted as Blattodea
- Order Amphiesmenoptera incertae sedis †
- Order Anoplura accepted as Phthiraptera
- Order Archaeognatha
- Order Archaeorthoptera (awaiting allocation) †
- Order Archaeorthoptera incertae sedis
- Order Argentinoptera †
- Order Blattodea
- Order Blattoptera †
- Order Caloneurida
- Order Caloneurodea †
- Order Cnemidolestodea †
- Order Coleoptera
- Order Coxoplectoptera †
- Order Dermaptera
- Order Diaphanopterodea †
- Order Diaphanopteroidea accepted as Diaphanopterodea †
- Order Dicliptera †
- Order Dicondylia incertae sedis
- Order Dictyoptera (awaiting allocation)
- Order Dictyoptera incertae sedis
- Order Diptera
- Order Embiodea
- Order Endopterygota incertae sedis
- Order Eoblattida †
- Order Ephemeroptera
- Order Eugeroptera †
- Order Geraroptera †
- Order Geroptera †
- Order Glosselytrodea †
- Order Grylloblattodea
- Order Hemiptera
- Family Acanaloniidae
- Family Acanthosomatidae Signoret, 1864
- Family Achilidae Stål, 1866
- Family Achilixiidae
- Family Aclerdidae
- Family Adelgidae Schouteden, 1909
- Family Adocimycolidae Poinar & Vega, 2023 †
- Family Aenictopecheidae
- Family Aetalionidae
- Family Agalliidae
- Family Aleyrodidae Westwood, 1840
- Family Alydidae Amyot & Serville, 1843
- Family Aneuridae
- Family Anoeciidae
- Family Anthocephalidae Kaddumi, 2005 †
- Family Anthocoridae Fieber, 1837
- Family Aphalaridae
- Family Aphelocheiridae
- Family Aphididae Latreille, 1802
- Family Aphidomorpha incertae sedis
- Family Aphrophoridae Amyot & Serville, 1843
- Family Aphylidae
- Family Apiomorphidae
- Family Apticoccidae Vea & Grimaldi, 2015 †
- Family Aradidae Spinola, 1837
- Family Archegocimicidae †
- Family Archescytinidae †
- Family Archiconiopterygidae Ansorge, 1996 †
- Family Archijassidae Becker-Migdisova, 1962 †
- Family Artheneidae
- Family Asiaticaphididae Żyła & Wegierek, 2020 †
- Family Asterolecaniidae
- Family Aviorrhynchidae Nel, Bourgoin, Engel & Szwedo in Nel et al., 2013 †
- Family Bajsaphididae Homan, Żyła & Wegierek, 2015 †
- Family Beesoniidae
- Family Belostomatidae Leach, 1815
- Family Bernaeidae †
- Family Berytidae Fieber, 1851
- Family Biturritiidae
- Family Blissidae Stål, 1862
- Family Boreoscytidae †
- Family Burmitaphididae Poinar & Brown, 2005 †
- Family Caliscelidae Amyot & Serville, 1843
- Family Callaphididae
- Family Calophyidae Vondráček, 1957
- Family Canadaphididae Richards, 1966 †
- Family Canopidae
- Family Cantacaderidae
- Family Capsidae
- Family Carayonemidae
- Family Carsidaridae
- Family Ceratocombidae
- Family Cercopidae Leach, 1815
- Family Cercopionidae †
- Family Cerococcidae
- Family Chiliocyclidae †
- Family Cicadellidae Latreille, 1825
- Family Cicadidae Batsch, 1789
- Family Cicadoidae accepted as Cicadidae Batsch, 1789
- Family Cicadoidea incertae sedis
- Family Cicadoprosbolidae †
- Family Cimicidae
- Family Cixiidae Spinola, 1839
- Family Clastopteridae Dohrn, 1859
- Family Coccidae
- Family Coleoscytidae †
- Family Colobathristidae
- Family Conchaspididae
- Family Coreidae Leach, 1815
- Family Corixidae Leach, 1815
- Family Creaphididae †
- Family Cryptococcidae
- Family Cryptorhamphidae
- Family Cryptostemmatidae
- Family Cuneocoridae †
- Family Curaliidae Schuh, Weirauch & Henry, 2008
- Family Curvicubitidae Hong, 1984 †
- Family Cydnidae Billberg, 1820
- Family Cymidae
- Family Cyrtocoridae
- Family Dactylopiidae
- Family Delphacidae Leach, 1815
- Family Deltocephalidae
- Family Derbidae Spinola, 1839
- Family Derbridae accepted as Derbidae Spinola, 1839
- Family Diaspididae
- Family Dictyopharidae Spinola, 1839
- Family Dinglidae Szwedo & Drohojowska in Drohojowska et al., 2020 † accepted as Miralidae Shcherbakov, 2020 †
- Family Dinidoridae
- Family Dipsocoridae
- Family Dorytocidae Emeljanov & Shcherbakov, 2018 †
- Family Dracaphididae Hong, Zhang, Guo & Heie, 2009 †
- Family Drepanosiphidae
- Family Dunstaniidae Tillyard, 1916 †
- Family Dysmorphoptilidae Handlirsch, 1906 †
- Family Ebboidae Perrichot, Nel, Guilbert & Neraudeau, 2006 †
- Family Elasmodemidae
- Family Electrococcidae Koteja, 2000 †
- Family Elektraphididae †
- Family Enicocephalidae Stål, 1860
- Family Epipygidae Hamilton, 2001
- Family Eriococcidae
- Family Eriosomatidae accepted as Aphididae Latreille, 1802
- Family Errhomenellidae
- Family Eumenotidae
- Family Eurybrachidae Stål, 1862
- Family Eurybrachyidae accepted as Eurybrachidae Stål, 1862
- Family Eurymelidae
- Family Evacanthidae
- Family Flatidae Spinola, 1839
- Family Fulgoridae Latreille, 1807
- Family Fulgorididae † accepted as Fulgoridiidae Handlirsch, 1939 †
- Family Fulgoridiidae Handlirsch, 1939 †
- Family Fulgoromorpha incertae sedis
- Family Gelastocoridae Kirkaldy, 1897
- Family Genaphididae †
- Family Gengidae
- Family Geocoridae Bärensprung, 1860
- Family Gerridae Leach, 1815
- Family Granulidae Hong, 1980 †
- Family Greenideidae
- Family Halimococcidae
- Family Hammanococcidae Koteja & Azar, 2008 †
- Family Hebridae Amyot & Serville, 1843
- Family Helotrephidae
- Family Hemiptera (awaiting allocation)
- Family Hemiptera incertae sedis
- Family Henicocoridae
- Family Hermatobatidae
- Family Heterogastridae Stål, 1872
- Family Heteroptera incertae sedis †
- Family Hispanocaderidae Golub, Popov & Arillo, 2012 †
- Family Hodgsonicoccidae Vea & Grimaldi, 2015 †
- Family Homaphididae accepted as Hormaphididae
- Family Homotomidae Heslop-Harrison, 1958
- Family Hormaphididae
- Family Hydrometridae
- Family Hylicellidae Evans, 1956 †
- Family Hylicidae
- Family Hyocephalidae
- Family Hypochthonellidae
- Family Hypsipterygidae
- Family Idioceridae
- Family Idiostolidae
- Family Ignotalidae Riek, 1973 †
- Family Ignotingidae Zhang, Golub, Popov & Shcherbakov, 2005 †
- Family Ingruidae †
- Family Inkaidae †
- Family Inoderbidae Shcherbakov & Emeljanov, 2021 †
- Family Ipsviciidae †
- Family Isolitaphidae Poinar, 2017 †
- Family Isometopidae
- Family Issidae Spinola, 1839
- Family Jankotejacoccidae Szwedo, Azar et Sendi, 2025 †
- Family Jascopidae †
- Family Jassidae
- Family Joppeicidae
- Family Jubisentidae Zhang, Ren & Yao, 2019 †
- Family Juraphididae Zyla, Blagoderov & Wegierek, 2014 †
- Family Jurocallidae Żyła & Wegierek, 2020 †
- Family Karabasiidae †
- Family Karanabidae †
- Family Katlasidae Luo, Jiang & Szwedo, 2020 †
- Family Kermesidae
- Family Kerridae accepted as Kerriidae Lindinger, 1937
- Family Kerriidae Lindinger, 1937
- Family Kinnaridae Muir, 1925
- Family Kobdocoridae Popov, 1986 †
- Family Kozariidae Vea & Grimaldi, 2015 †
- Family Kuwaniidae MacGillivray, 1921 †
- Family Lachnidae Koch, 1857
- Family Lalacidae Hamilton, 1990 †
- Family Largidae
- Family Latiscutellidae Pinto & Ornellas, 1974 † accepted as Cydnidae Billberg, 1820
- Family Lebanococcidae Koteja & Azar, 2008 †
- Family Lecanodiaspididae
- Family Ledridae accepted as Cicadellidae Latreille, 1825
- Family Leotichiidae
- Family Leptopodidae Brullé, 1836
- Family Lestoniidae
- Family Liadopsyllidae Martynov, 1927 †
- Family Ligavenidae †
- Family Liviidae Loew, 1879
- Family Lodevopsyllidiidae Boderau, Garrouste & Nel, 2024 †
- Family Lophopidae Stål, 1866
- Family Lutevanaphididae Szwedo, Lapeyrie & Nel, 2015 †
- Family Lygaeidae Schilling, 1829
- Family Machaeroidae accepted as Machaerotidae Stål, 1866
- Family Machaerotidae Stål, 1866
- Family Macrodrilidae Poinar, 2020 †
- Family Macropsidae accepted as Cicadellidae Latreille, 1825
- Family Macroveliidae
- Family Madeoveliidae
- Family Magnacicadiidae †
- Family Maguviopseidae Shcherbakov, 2011 †
- Family Malcidae Stål, 1866
- Family Malmopsyllidae Becker-Migdisova, 1985 †
- Family Margarodidae
- Genus Acerya accepted as Icerya Signoret, 1875
- Genus Acreagris Koch in Berendt, 1854
- Genus Acreagris Koch in Berendt, 1845
- Genus Acystomargarodes
- Genus Afrodroischa Vayssiere, 1968
- Genus Afrodrosicha
- Genus Americoccus MacGillivray, 1921
- Genus Araucaricoccus Brimblecombe, 1960
- Genus Araucariococcus Brimblecombe, 1960 accepted as Araucaricoccus Brimblecombe, 1960
- Genus Arnoldus Koteja, 2008 †
- Genus Aspidoproctus Newstead, 1901
- Genus Auloicerya Morrison, 1923
- Genus Buchnericoccus Reyne, 1965
- Genus Caelostoma Maskell, 1884 accepted as Coelostomidia Cockerell, 1900
- Genus Callipappus Guérin-Méneville, 1841
- Genus Clypeococcus Newstead, 1920
- Genus Coccionella Hahnemann, 1793 accepted as Porphyrophora Brandt & Ratzeburg, 1833
- Genus Coelostoma Maskell, 1880 accepted as Coelostomidia Cockerell, 1900
- Genus Coelostomidia Cockerell, 1900
- Genus Conifericoccus Brimblecombe, 1960
- Genus Crambostoma Gavrilov-Zimin, 2018
- Genus Criniverticillus Lin, Yao & Ren, 2018 †
- Genus Crossotoma Douglas, 1890 accepted as Icerya Signoret, 1875
- Genus Crossotosoma Douglas, 1890
- Genus Crypticerya Cockerell, 1895
- Species Crypticerya abrahami (Newstead, 1917)
- Species Crypticerya bicolor (Newstead, 1917)
- Species Crypticerya braziliensis Vayssière, 1926 accepted as Palaeococcus brasiliensis (Walker, 1852)
- Species Crypticerya cajani (Newstead, 1917)
- Species Crypticerya caudatus (Newstead, 1917)
- Species Crypticerya clauseni Rao, 1951
- Species Crypticerya ewarti (Newstead, 1896)
- Species Crypticerya hempeli Hempel, 1900 accepted as Mimosicerya hempeli (Cockerell, 1899)
- Species Crypticerya jacobsoni (Green, 1913)
- Species Crypticerya jaihind Rao, 1951
- Species Crypticerya jakobsoni Tao, 1999 accepted as Crypticerya jacobsoni (Green, 1913)
- Species Crypticerya kumari Rao, 1951
- Species Crypticerya mangiferae Tang, 1995
- Species Crypticerya natalensis (Douglas, 1888)
- Species Crypticerya nuda (Green, 1930)
- Species Crypticerya nudata Cockerell, 1899 accepted as Steatococcus nudatus (Maskell, 1896)
- Species Crypticerya pimentae (Newstead, 1917)
- Species Crypticerya plucheae Cockerell, 1902 accepted as Steatococcus plucheae (Cockerell, 1896)
- Species Crypticerya primitiva Vayssière, 1926 accepted as Protortonia primitiva (Townsend, 1898)
- Species Crypticerya rodriguesi Castel-Branco, 1952
- Species Crypticerya rosae (Riley, 1890)
- Species Crypticerya townsendi Cockerell, 1899 accepted as Steatococcus townsendi (Cockerell, 1896)
- Genus Cryptokermes Hempel, 1900
- Genus Cryticerya
- Genus Desmococcus McKenzie, 1942
- Genus Deuteromargarodes
- Genus Dimargarodes
- Genus Drosicha Walker, 1858
- Genus Drosichiella Morrison, 1927
- Genus Drosichoides Morrison, 1927
- Genus Drosycha Signoret, 1875 accepted as Drosicha Walker, 1858
- Genus Echinicerya Morrison, 1930
- Genus Ecuadortonia Ben-Dov, 2004
- Genus Eomatsucoccus Koteja, 1988
- Genus Eremostoma Gavrilov-Zimin, 2018
- Genus Etropera Bhatti & Gullan, 1990
- Genus Eumargarodes Jakubski, 1950
- Genus Eumatsucoccus
- Genus Eurchizococcus
- Genus Eurhizococcus Silvestri, 1936
- Genus Gerinia
- Genus Gigantococcus Pesson & Bielenin, 1966
- Genus Gompholopium Gavrilov-Zimin, 2021
- Genus Grohnus Koteja, 2008 †
- Genus Guerinia Targioni-Tozzetti, 1868 accepted as Gueriniella Fernald, 1903
- Genus Gueriniella Fernald, 1903
- Genus Guerinococcus
- Genus Gullania Foldi, 1998
- Genus Hemaspidoproctus Morrison, 1927
- Genus Heterodera Philippi, 1903
- Genus Heteromargarodes Jakubski, 1965
- Genus Hodgsonius Foldi, 1998 accepted as Neohodgsonius Foldi, 1999
- Genus Iceria Signoret, 1875 accepted as Icerya Signoret, 1875
- Genus Icerya Signoret, 1875
- Genus Insulococcus Bhatti, 1991
- Genus Kuwaia
- Genus Kuwanaia
- Genus Kuwania Fernald, 1903
- Genus Kuwaniella Tang, 1984
- Genus Labioproctus Green, 1922
- Genus Laurencella Foldi, 1995
- Genus Leachia Signoret, 1876 accepted as Palaeococcus Cockerell, 1894
- Genus Lecaniodrosicha Takahashi, 1930
- Genus Lithuanicoccus Koteja, 2008 †
- Genus Llavea accepted as Llaveia Signoret, 1876
- Genus Llaveella
- Genus Llaveia Signoret, 1876
- Genus Llaveiella Morrison, 1927
- Genus Lophococcus Cockerell, 1901
- Genus Marchalina Vayssière, 1925
- Genus Margarodes Guilding, 1829
- Genus Margarodesia Foldi, 1981
- Genus Margarodiella
- Genus Matesovia Jaschenko & Danzig, 1992
- Genus Matsococcus
- Genus Matsucoccus Cockerell, 1909
- Genus Melaleucococcus Bhatti, 1990
- Genus Mimosicerya Cockerell, 1902
- Genus Misracoccus Prabhaker Rao, 1950
- Genus Modicicoccus Bhatti & Gullan, 1990
- Genus Monophleba Latreille in Cuvier, 1829 accepted as Monophlebus Guérin-Méneville, 1827
- Genus Monophlebidus Morrison, 1927
- Genus Monophleboides Morrison, 1927
- Genus Monophlebulus Cockerell, 1902
- Genus Monophlebus Guérin-Méneville, 1827
- Genus Monophloebus Targioni, 1869 accepted as Monophlebus Guérin-Méneville, 1827
- Genus Nautococcus Vayssière, 1939
- Genus Neocoelostoma Hempel, 1932
- Genus Neohodgsonius Foldi, 1999
- Genus Neohogsonius Gavrilov-Zimin, 2018 accepted as Neohodgsonius Foldi, 1999
- Genus Neomargarodes Green, 1914
- Genus Neosteingelia Morrison, 1927
- Genus Newsteadiella Macgillivray, 1921
- Genus Nietnera Green, 1922
- Genus Nodulicoccus Morrison, 1923
- Genus Ortheziopa Laing, 1925
- Genus Ortonia Signoret, 1875
- Genus Palaeococcus Cockerell, 1894
- Genus Paleococcus Berlese & Leonardi, 1898 accepted as Palaeococcus Cockerell, 1894
- Genus Paracoelostoma Morrison, 1927
- Genus Paragreenia Macgillivray, 1921 accepted as Neogreenia Macgillivray, 1921
- Genus Parakuwania Borkhsenius, 1960
- Genus Pauroaspis Tang in Tang & Hao, 1995
- Genus Peengea Bhatti & Gullan, 1990
- Genus Pericerya Silvestri, 1939
- Genus Perissopneumon Newstead, 1900
- Genus Peryceria
- Genus Perycerya
- Genus Pityococcus McKenzie, 1942
- Genus Platycoelostoma Morrison, 1923
- Genus Porphyrophora Brandt & Ratzeburg, 1833
- Genus Preicerya
- Genus Promargarodes Silvestri, 1938
- Genus Promargodes Silvestri, 1938 accepted as Margarodes Guilding, 1829
- Genus Protortonia Townsend, 1898
- Genus Prototonia
- Genus Pseudaspidoproctus Morrison, 1927
- Genus Pseudoweitschatus Vea & Grimaldi, 2015 †
- Genus Rhizobius Buckton, 1883
- Genus Sasakia Kuwana, 1902 accepted as Kuwania Fernald, 1903
- Genus Serafinus Koteja, 2008 †
- Genus Sishania Ferris, 1950
- Genus Sonsaucoccus
- Genus Sphaeraspis Giard, 1897
- Genus Steatococcus Ferris, 1921
- Genus Steingelia Nassonow, 1908
- Genus Stigmacoccus Hempel, 1900
- Genus Stomacoccus Ferris, 1917
- Genus Termiticoccus
- Genus Termitococcus Silvestri, 1901
- Genus Tessarobelus Montrouzier, 1864
- Genus Ultracoelostoma Cockerell, 1902
- Genus Villigera Karsch, 1877 accepted as Drosicha Walker, 1858
- Genus Vrydagha Vayssiére, 1957
- Genus Walkeriana Signoret, 1876
- Genus Warajicoccus Kuwana, 1922
- Genus Weitschatus Koteja, 2008 †
- Genus Xyloccoculus
- Genus Xylococculus Morrison, 1927
- Genus Ycerya
- Family Matsucoccidae
- Family Medocostidae
- Family Meenoplidae
- Family Megarididae
- Family Membracidae Rafinesque, 1815
- Family Meschiidae Malipatil, 2014
- Family Mesogereonidae †
- Family Mesopentacoridae †
- Family Mesotrephidae †
- Family Mesoveliidae Douglas & Scott, 1867
- Family Micrococcidae
- Family Micronectidae Jaczewski, 1924
- Family Microphysidae
- Family Mimarachnidae Shcherbakov, 2007 †
- Family Mindaridae
- Family Minlagerrontidae Chen, Szwedo & Wang, 2019 †
- Family Miralidae Shcherbakov, 2020 †
- Family Miridae Hahn, 1831
- Family Monophlebidae Signoret, 1875
- Family Myerslopiidae
- Family Nabidae Costa, 1853
- Family Naucoridae Leach, 1815
- Family Neazoniidae Szwedo, 2007 †
- Family Neopsylloididae †
- Family Nepidae Latreille, 1802
- Family Nepoidea incertae sedis
- Family Nicomiidae
- Family Ninidae
- Family Nogodinidae Melichar, 1898
- Family Notonectidae Latreille, 1802
- Family Ochteridae Kirkaldy, 1906
- Family Ochteroidea incertae sedis †
- Family Omaniidae Cobben, 1970
- Family Ortheziidae Amyot & Serville, 1843
- Family Oviparosiphidae Shaposhnikov, 1979 †
- Family Oxycarenidae
- Family Pachygronthidae
- Family Pachymeridiidae †
- Family Pachynomidae Stål, 1873
- Family Palaeoaphididae †
- Family Palaeoleptidae Poinar, 2009 †
- Family Palaeontinidae Handlirsch, 1906 †
- Family Palaeotanyrhinidae Poinar, Brown & Kóbor, 2022 †
- Family Paraknightiidae Evans, 1950 †
- Family Paraphrynoveliidae
- Family Paraprotopsyllidiidae Hakim, Azar, Szwedo, Drohojowska & Huang, 2021 †
- Family Parvaverrucosidae Poinar & Brown, 2006 †
- Family Pbyllocephalidae accepted as Pentatomidae Leach, 1815
- Family Peataspidae
- Family Peloridiidae
- Family Pemphigidae accepted as Aphididae Latreille, 1802
- Family Pennygullaniidae Koteja & Azar, 2008 †
- Family Pentatomidae Leach, 1815
- Family Pereboriidae Zalessky, 1930 †
- Family Perforissidae Shcherbakov, 2007 †
- Family Permoridiidae Burckhardt, Nel, Raisch, Poschmann, 2022 †
- Family Phacopteronidae
- Family Phenacoleachiidae
- Family Phloeidae
- Family Phoenicococcidae
- Family Phyllocephalidae accepted as Pentatomidae Leach, 1815
- Family Phylloxeridae Herrich-Schaeffer, 1854
- Family Phymatidae
- Family Piesmatidae
- Family Piesmidae accepted as Piesmatidae
- Family Pincombeidae †
- Family Pityococcidae
- Family Plataspidae
- Family Plataspididae accepted as Plataspidae
- Family Pleidae
- Family Plokiophilidae
- Family Polyctenidae
- Family Postopsyllidiidae Hakim, Azar & Huang, 2019 †
- Family Pricecoridae Pinto & Ornellas, 1974 † accepted as Cydnidae Billberg, 1820
- Family Primipentatomidae Yao, Cai, Rider & Ren, 2013 †
- Family Probascaniidae †
- Family Procercopidae Handlirsch, 1906 †
- Family Progonocimicidae Handlirsch, 1906 †
- Family Propreocoridae Popov, Dolling & Whalley, 1994 †
- Family Prosbolecicadidae †
- Family Prosbolidae Handlirsch, 1906 †
- Family Prosbolopseidae †
- Family Protocoridae †
- Family Protopsyllidiidae Becker-Migdisova, 1960 †
- Family Pseudococcidae Heymons, 1915
- Family Psyliidae accepted as Psyllidae Latreille, 1807
- Family Psyllidae Latreille, 1807
- Family Pterocimicidae †
- Family Putoidae
- Family Pyrrhocoridae
- Family Qinococcidae Wu, 2022
- Family Rasnitsynaphididae Homan & Wegierek, 2011 †
- Family Reduviidae Latreille, 1807
- Family Rhopalidae
- Family Rhyparochromidae Amyot & Serville, 1843
- Family Ricaniidae Amyot & Audinet-Serville, 1843
- Family Saldidae
- Family Scaphocoridae †
- Family Schizopteridae Reuter, 1891
- Family Scutelleridae Leach, 1815
- Family Scytinopteridae Handlirsch, 1906 †
- Family Scytinopteroidea incertae sedis †
- Family Serpentivenidae †
- Family Shaposhnikoviidae †
- Family Shurabellidae †
- Family Simulaphididae Shcherbakov, 2007 †
- Family Sinaphididae Zhang et al., 1989 †
- Family Sinoalidae Wang & Szwedo, 2012 †
- Family Sinojuraphididae Huang & Nel, 2008 †
- Family Steingeliidae Morrison, 1927 †
- Family Stemmocryptidae
- Family Stenocephalidae
- Family Stenoviciidae Evans, 1956 †
- Family Stictococcidae
- Family Surijokocixiidae Shcherbakov, 2000 †
- Family Szeiiniidae Zhang, Jiang, Szwedo & Zhang, 2021 †
- Family Tachardiidae
- Family Taimyrocoridae Popov, 2016 †
- Family Tajmyraphididae Kononova, 1975 †
- Family Termitaphididae
- Family Tessaratomidae Stål, 1865
- Family Tettigarctidae Distant, 1905
- Family Tettigellidae
- Family Tettigometridae
- Family Thaumastellidae
- Family Thaumastocoridae Kirkaldy, 1908
- Family Thelaxidae
- Family Thyreocoridae
- Family Tibicinidae
- Family Tingidae Laporte, 1833
- Family Tingididae accepted as Tingidae Laporte, 1833
- Family Torirostratidae Yao, Cai, Shih & Engel, 2014 †
- Family Triassocoridae Tillyard, 1922 †
- Family Triozidae Loew, 1879
- Family Tropiduchidae Stål, 1866
- Family Typhlocybidae accepted as Cicadellidae Latreille, 1825
- Family Ulopidae accepted as Cicadellidae Latreille, 1825
- Family Urostylidae Dallas, 1851 accepted as Urostylididae
- Family Urostylididae
- Family Veliidae Amyot & Serville, 1843
- Family Velocipedidae Bergroth, 1891
- Family Venicoridae Yao, Ren & Cai, 2012 † accepted as Kobdocoridae Popov, 1986 †
- Family Vetanthocoridae Yao, Cai & Ren, 2006 †
- Family Vianaididae
- Family Weiwoboidae Lin, Szwedo, Huang & Stroiński, 2010 †
- Family Xulsigiidae Szwedo, Weis & Nel, 2017 †
- Family Xylococcidae Pergrande, 1898
- Family Yetkhatidae Song, Szwedo & Bourgoin, 2019 †
- Family Yuripopovinidae Azar, Nel, Engel, Garrouste & Matocq, 2011 †
- Genus Lodevopsyllidium Boderau, Garrouste & Nel, 2024 †
- Order Homoptera accepted as Hemiptera
- Order Hymenoptera
- Order Hypoperlida †
- Order Insecta (awaiting allocation)
- Order Insecta incertae sedis
- Order Isoptera accepted as Blattodea
- Order Kukaloptera †
- Order Lepidoptera
- Order Lophioneurida †
- Order Mallophaga
- Order Mantodea
- Order Mantophasmatodea
- Order Mecoptera
- Order Mecopterida incertae sedis
- Order Megaloptera
- Order Megasecoptera †
- Order Miomoptera †
- Order Neoptera incertae sedis
- Order Neuroptera
- Order Neuropteroidea incertae sedis †
- Order Notoptera
- Order Odonata
- Order Odonatoptera (awaiting allocation) †
- Order Odonatoptera incertae sedis
- Order Orthoptera
- Order Orthopterida incertae sedis
- Order Palaeodictyoptera †
- Order Palaeoptera incertae sedis
- Order Panorthoptera incertae sedis
- Order Paoliida †
- Order Paraneoptera (awaiting allocation)
- Order Perielytrodea †
- Order Permopsocida †
- Order Permotrichoptera †
- Order Phasmatodea
- Order Phasmida accepted as Phasmatodea
- Order Phasmoptera accepted as Phasmatodea
- Order Phthiraptera
- Order Plecoptera
- Order Polyneoptera incertae sedis
- Order Protelytroptera †
- Order Protoblattoidea †
- Order Protocoleoptera † accepted as Protelytroptera †
- Order Protodonata †
- Order Protoelytroptera †
- Order Protohemiptera †
- Order Protohymenoptera †
- Order Protorthoptera †
- Order Protozygoptera †
- Order Psocoptera
- Order Raphidioptera
- Order Siphonaptera
- Order Skleroptera †
- Order Strepsiptera
- Order Tarachoptera †
- Order Thripida incertae sedis
- Order Thysanoptera
- Order Thysanura accepted as Insecta
- Order Titanoptera †
- Order Trichoptera
- Order Zoraptera
- Order Zygentoma
- Genus Bifarius Tasch, 1961 †
- Genus Cyclocephalus Tasch, 1961 †
- Genus Hypatocephala Tasch, 1961 †
- Genus Permolimulinella Tasch, 1963 †
- Genus Strongylocephalus Tasch, 1961 †
- Class Protura
- Subphylum Myriapoda
- Subphylum Trilobitomorpha †
- Class Arachnomorpha (awaiting allocation)
- Class Arthropoda (awaiting allocation)
- Class Artiopoda †
- Class Crustaceomorpha incertae sedis †
- Class Dinocaridida †
- Class Labrophora incertae sedis
- Class Lamellipedia incertae sedis
- Class Megacheira †
- Class Thylacocephala †
- Class Xenocarida incertae sedis
- Order Canadaspidida † accepted as Hymenocarina †
- Order Cheloniellida †
- Order Emeraldellida † accepted as Arthropoda
- Order Fuxianhuiida †
- Order Habeliida †
- Order Hymenocarina †
- Order Isoxyida †
- Order Pectocaridida † accepted as Hymenocarina †
- Order Waptiida † accepted as Hymenocarina †
- Family Bomakellidae Fedonkin, 1987 †
- Family Burgessiidae Walcott, 1912 †
- Family Emeraldellidae Raymond, 1935 †
- Family Guangweicarididae Luo, Fu, Hu, Li, Hou, You, Pang & Liu, 2007 †
- Genus Aaveqaspis Peel & Stein, 2009 †
- Genus Acheronauta Pulsipher, Anderson, Wright, Kluessendorf, Mikulic & Schiffbauer, 2022 †
- Genus Arthroaspis Stein, Budd, Peel & Harper, 2013 †
- Genus Astutuscaris Jiao & Du, 2022 †
- Genus Bennettarthra Fayers, Trewin & Morrissey, 2010 †
- Genus Bushizheia O'Flynn & Liu in O'Flynn et al., 2020 †
- Genus Chuandianella Hou & Bergström, 1991 †
- Genus Dioxycaris Gürich, 1929 †
- Genus Dongshanocaris Hou, Bergström, Wang, Feng & Chen, 1999 †
- Genus Duraznovis Lara, Cariglino & Zavattieri in Lara et al., 2019 †
- Genus Duraznovs Lara, Cariglino & Zavattieri in Lara et al., 2019 † accepted as Duraznovis Lara, Cariglino & Zavattieri in Lara et al., 2019 †
- Genus Esmeraldacaris Waggoner, 2003 †
- Genus Fibulacaris Izquierdo-López & Caron, 2019 †
- Genus Kiisortoqia Stein, 2010 †
- Genus Kylinxia Zeng, Zhao, Niu, Zhu & Huang, 2020 †
- Genus Lihuacaris Jiao, Pates, Lerosey-Aubril, Ortega-Hernández, Yang, Lan & Zhang, 2021 †
- Genus Norikeya Tanaka, Siveter & Williams, 2013 †
- Genus Nothozoe Barrande, 1872 †
- Genus Nothozoe Barrande in Bigsby, 1868 † accepted as Nothozoe Barrande, 1872 †
- Genus Notozoe Zittel, 1885 † accepted as Nothozoe Barrande, 1872 †
- Genus Pakucaris Izquierdo-López & Caron, 2021 †
- Genus Pambdelurion Budd, 1998 †
- Genus Parvibellus Liu, Dunlop, Steiner & Shu, 2022 †
- Genus Pleuralata McCoy, Strother & Briggs, 2012 †
- Genus Pseudoangustidontus Van Roy & Tetlie, 2006 †
- Genus Pteroessa Hudson & Gosse, 1886
- Genus Sidneyia Walcott, 1911 †
- Genus Siriocaris Lagebro, Stein & Peel, 2009 †
- Genus Vermontcaris Pari, Briggs & Gaines, 2022 †
- Genus Youti Smith, Long, Dhungana, Dobson, Yang & Zhang, 2024 †
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Phylum Cnidaria
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia incertae sedis
- Phylum Ecdysozoa incertae sedis †
- Phylum Echinodermata
- Phylum Entoprocta
- Phylum Gastrotricha
- Phylum Gnathostomulida
- Phylum Hemichordata
- Phylum Hyolitha †
- Phylum Kinorhyncha
- Phylum Lobopoda †
- Phylum Loricifera
- Phylum Micrognathozoa
- Phylum Mollusca
- Phylum Monoblastozoa accepted as Animalia incertae sedis
- Phylum Nematoda
- Phylum Nematomorpha
- Phylum Nemertea
- Phylum Onychophora
- Phylum Orthonectida
- Phylum Phoronida
- Phylum Placozoa
- Phylum Platyhelminthes
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera
- Phylum Priapula accepted as Priapulida
- Phylum Priapulida
- Phylum Problematica † accepted as Animalia incertae sedis
- Phylum Rhombozoa
- Phylum Rotifera
- Phylum Scalidophora incertae sedis
- Phylum Sipuncula
- Phylum Tardigrada
- Phylum Trace fossils †
- Phylum Vendobionta †
- Phylum Vestimentifera accepted as Siboglinidae Caullery, 1914
- Phylum Vetulicolia †
- Phylum Vinctiplicata incertae sedis †
- Phylum Xenacoelomorpha
- Genus Trilobocaris Pribyl, 1953 †
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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