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
- Family Acanthametropodidae
- Family Aenigmephemeridae Tshernova, 1968 †
- Family Ameletidae
- Family Ameletopsidae Edmunds, 1957
- Family Ametropidae Bengtsson, 1913 accepted as Ametropodidae Bengtsson, 1913
- Family Ametropodidae Bengtsson, 1913
- Family Aphelophlebodidae Pierce, 1945 †
- Family Arthropleidae Balthasar, 1937
- Family Astraeopteridae Storari, Staniczek & Godunko, 2023 †
- Family Australiphemeridae McCafferty, 1991
- Family Babidae Kluge, Godunko & Krzeminski, 2006 †
- Family Baetidae Leach, 1815
- Family Baetiscidae Banks, 1900
- Family Behningiidae Motas & Bacesco, 1937
- Family Binoculidae Demoulin, 1954 accepted as Prosopistomatidae Lameere, 1917
- Family Bojophlebiidae Kukalova-Peck, 1985 †
- Family Brachycercidae Lestage, 1924 accepted as Caenidae Newman, 1853
- Family Caenidae Newman, 1853
- Family Callibaetidae Riek, 1973 accepted as Baetidae Leach, 1815
- Family Cloeonidae Newman, 1853 accepted as Baetidae Leach, 1815
- Family Coenidae Newman, 1853 accepted as Caenidae Newman, 1853
- Family Coloburiscidae
- Family Dipteromimidae Kluge, Studemann, Landolt & Gonser, 1995 accepted as Siphlonuridae Banks, 1900
- Family Ecdyoneuridae
- Family Epeoromimidae Tshernova, 1969 †
- Family Ephemerellidae Klapálek, 1909
- Family Ephemeridae Leach, 1817
- Family Ephemeropsidae Cockerell, 1927 † accepted as Hexagenitidae Lameere, 1917 †
- Family Ephemeroptera (awaiting allocation)
- Family Ephemeroptera incertae sedis †
- Family Ephemerythidae Gillies, 1960
- Family Ephoridae Traver in Needham, Traver & Hsu, 1935 accepted as Polymitarcyidae Banks, 1900
- Family Euthyplociidae Lestage, 1921
- Family Fuyoidae Zhang & Kluge, 2007 †
- Family Heptaeniidae accepted as Heptageniidae Needham, 1901
- Family Heptageniidae Needham, 1901
- Genus Acanthomola Whiting & Lehmkuhl, 1987
- Genus Afghanurus Demoulin, 1964
- Genus Afronurus Lestage, 1924
- Genus Akkarion Flowers, 1980 accepted as Afghanurus Demoulin, 1964
- Genus Albertiron Kluge, 2004 accepted as Belovius Chernova, 1981
- Genus Alpiron Braasch, 2006 accepted as Iron Eaton, 1883
- Genus Amerogenia Sinitshenkova, 2000 †
- Genus Anepeorus McDunnough, 1925
- Genus Asionurus Braasch & Soldán, 1986
- Genus Atopopus Eaton, 1881
- Genus Belovius Chernova, 1981
- Genus Bleptus Eaton, 1885
- Genus Burmaheptagenia Chen & Zheng, 2023 †
- Genus Burshtynogena Godunko & Sontag, 2004 †
- Genus Caucasiron Kluge, 1997 accepted as Epeorus Eaton, 1881
- Genus Cinygma Eaton, 1885
- Genus Cinygmoides Matsumura, 1931 accepted as Cinygma Eaton, 1885
- Genus Cinygmula McDunnough, 1933
- Genus Compsoneuria Eaton, 1881
- Genus Compsoneuriella Ulmer, 1939 accepted as Thalerosphyrus Eaton, 1881
- Genus Dacnogenia Kluge, 1988 accepted as Heptagenia Walsh, 1863
- Genus Darthus Webb & McCafferty, 2007
- Genus Ecdyogymnurus Kluge, 2004 accepted as Leucrocuta Flowers, 1980
- Genus Ecdyonuroides Dang, 1967
- Genus Ecdyonurus Eaton, 1868
- Genus Ecdyurus Eaton, 1868 accepted as Ecdyonurus Eaton, 1868
- Genus Electrogena Zurwerra & Tomka, 1985
- Genus Epeiron Demoulin, 1964 accepted as Cinygmula McDunnough, 1933
- Genus Epeorella Ulmer, 1939
- Genus Epeorus Eaton, 1881
- Genus Helvetoraeticus Bauernfeind & Soldán, 2012 accepted as Ecdyonurus Eaton, 1868
- Genus Heptagenia Walsh, 1863
- Genus Himalogena Kluge, 2004 accepted as Rhithrogena Eaton, 1881
- Genus Iron Eaton, 1883
- Genus Ironodes Traver, 1935
- Genus Ironopsis Traver, 1935
- Genus Kageronia Matsumura, 1931 accepted as Heptagenia Walsh, 1863
- Genus Leucrocuta Flowers, 1980
- Genus Lewisa Zembrzuski & Anderson, 2018 accepted as Stenonema Traver, 1933
- Genus Longiheptagenia Yang, Zhao, Ren & Zhao, 2023 †
- Genus Maccaffertium Bednarik, 1979 accepted as Stenonema Traver, 1933
- Genus Macdunnoa Lehmkuhl, 1979
- Genus Miocoenogenia Tshernova, 1962 †
- Genus Neocloeon Traver, 1932 accepted as Centroptilum Eaton, 1869
- Genus Nestormeus Godunko, 2004
- Genus Nixe Flowers, 1980
- Genus Notacanthurus Chernova, 1974
- Genus Notonurus Crass, 1947 accepted as Thalerosphyrus Eaton, 1881
- Genus Ororotsia Traver, 1939 accepted as Cinygmula McDunnough, 1933
- Genus Paegniodes Eaton, 1881
- Species Paegniodes cupulata (Eaton, 1981)
- Species Paegniodes dao Nguyen & Bae, 2004
- Species Paegniodes fukiensis Hsu, 1932 accepted as Paegniodes cupulata (Eaton, 1981)
- Species Paegniodes wuyiensis Gui, Zhou & Su, 1999
- Genus Palawaneuria Braasch & Freitag, 2008 accepted as Compsoneuria Eaton, 1881
- Genus Paracinygmula Baikova, 1975 accepted as Afghanurus Demoulin, 1964
- Genus Parafronurus Zhou & Braasch, 2003
- Genus Parastenacron Kluge, 1983 accepted as Heptagenia Walsh, 1863
- Genus Proepeorus Kluge, 2004 accepted as Epeorus Eaton, 1881
- Genus Pseudokageronia Masselot & Nel, 1999 †
- Genus Raptoheptagenia Whiting & Lehmkuhl, 1987
- Genus Regulaneuria Zhou in Lei et al., 2021
- Genus Rhithrogena Eaton, 1881
- Genus Rhithrogeniella
- Genus Rhitrogena Klapálek, 1905 accepted as Rhithrogena Eaton, 1881
- Genus Siamoneuria Braasch, 2006 accepted as Compsoneuria Eaton, 1881
- Genus Siberionurus McCafferty, 2004 accepted as Leucrocuta Flowers, 1980
- Genus Sibirigena Kluge, 2004 accepted as Rhithrogena Eaton, 1881
- Genus Sigmoneuria Demoulin, 1964 accepted as Heptagenia Walsh, 1863
- Genus Siniron Ma & Zhou, 2022 accepted as Epeorus Eaton, 1881
- Genus Spinadis Edmunds & Jensen, 1974 accepted as Anepeorus McDunnough, 1925
- Genus Stenacron Jensen, 1974
- Genus Stenocron
- Genus Stenonema Traver, 1933
- Genus Succinogenia Demoulin, 1965 †
- Genus Thalerosphyrus Eaton, 1881
- Genus Thamnodontus Kluge, 2004
- Genus Trichogenia Braasch & Soldán, 1988 accepted as Heptagenia Walsh, 1863
- Genus Tumungula Zhou & Peters, 2004 accepted as Rhithrogena Eaton, 1881
- Family Hexagenitidae Lameere, 1917 †
- Family Hexgenitidae † accepted as Hexagenitidae Lameere, 1917 †
- Family Isonychiidae
- Family Jarmilidae Demoulin, 1970 †
- Family Leptohyphidae Edmunds & Traver, 1954
- Family Leptophlebiidae Banks, 1900
- Family Lithoneuridae Sroka, Staniczek & Bechly, 2015 †
- Family Litophlebiidae †
- Family Mesephemeridae Lameere, 1917 †
- Family Mesonetidae
- Family Mesoplectopteridae Demoulin, 1955 †
- Family Metretopodidae
- Family Misthodotidae Tillyard, 1932 †
- Family Neoephemeridae Traver in Needham, Traver & Hsu, 1935
- Family Nesameletidae
- Family Oboriphlebiidae Hubbard & Kukalova-Peck, 1980 †
- Family Oculephemeridae Zheng & Chen, 2024 †
- Family Oligoneuriidae Ulmer, 1914
- Family Oniscigastridae Lameere, 1917
- Family Paedephemeridae Lameere, 1917 † accepted as Hexagenitidae Lameere, 1917 †
- Family Palingeniidae Albarda in Selys-Lonchamps, 1888
- Family Palingeniopsidae Martynov, 1938 † accepted as Mesephemeridae Lameere, 1917 †
- Family Polymitarcidae accepted as Polymitarcyidae Banks, 1900
- Family Polymitarcyidae Banks, 1900
- Family Potamanthidae Albarda in Selys-Lonchamps, 1888
- Family Prosopistomatidae Lameere, 1917
- Family Prosopistomidae Lameere, 1917 accepted as Prosopistomatidae Lameere, 1917
- Family Protereismatidae Lameere, 1917 †
- Family Protereismephemeridae Sellards, 1907 † accepted as Protereismatidae Lameere, 1917 †
- Family Pseudironidae
- Family Rallidentidae
- Family Sharephemeridae Sinitshenkova, 2002 †
- Family Siphlaenigmatidae Penniket, 1962
- Family Siphlonephemerellidae Chen & Zheng, 2023 †
- Family Siphlonuridae Banks, 1900
- Family Stenodicranidae Demoulin, 1954 † accepted as Hexagenitidae Lameere, 1917 †
- Family Syntonopteridae Handlirsch, 1911 †
- Family Teloganodidae Allen, 1965 accepted as Ephemerellidae Klapálek, 1909
- Family Tintorinidae Krzeminski & Lombardo, 2001 †
- Family Torephemeridae Sinitshekova, 1989 †
- Family Toxodotidae Sinitshenkova & Papier, 2005 †
- Family Triassoephemeridae Sinitshenkova & Papier, 2005 †
- Family Triassomanthidae Sinitshenkova & Papier, 2005 †
- Family Tricorythidae Lestage, 1942
- Family Triplosobidae Handlirsch, 1906 †
- Family Vietnamellidae Allen, 1984
- Family Vogesonymphidae Sinitshenkova & Papier, 2005 †
- Family Voltziaephemeridae Sinitshenkova & Papier, 2005 †
- Order Eugeroptera †
- Order Geraroptera †
- Order Geroptera †
- Order Glosselytrodea †
- Order Grylloblattodea
- Order Hemiptera
- 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 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 †
- 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 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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