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
- Genus Abaetetuba Cruz, Salles & Hamada, 2017 accepted as Callibaetis Eaton, 1881
- Genus Acanthiops Waltz & McCafferty, 1987
- Genus Acentrella Bengtsson, 1912
- Genus Acerbaetis Kang & Yang in Kang, Chang & Yang, 1994 accepted as Alainites Waltz & McCafferty in Waltz, McCafferty & Thomas, 1994
- Genus Acerobiella Gattolliat, 2012
- Genus Acerpenna Waltz & McCafferty, 1987
- Genus Adebrotus Lugo-Ortiz & McCafferty, 1995
- Genus Adnoptilum Gattolliat & Monaghan, 2010
- Genus Afrobaetodes Demoulin, 1970
- Genus Afroptiloides Gillies, 1990 accepted as Acanthiops Waltz & McCafferty, 1987
- Genus Afroptilum Gillies, 1990
- Genus Aiso Cruz, Salles & Hamada, 2017 accepted as Callibaetis Eaton, 1881
- Genus Alainites Waltz & McCafferty in Waltz, McCafferty & Thomas, 1994
- Genus Americabaetis Kluge, 1992
- Genus Anafroptilum Kluge, 2011
- Genus Andesiops Lugo-Ortiz & McCafferty, 1999
- Genus Apobaetis Day, 1955
- Genus Aquaediva Salles, Gattolliat & Sartori, 2015 accepted as Potamocloeon Gillies, 1990
- Genus Arcobaetis Kaltenbach, Klug & Gattolliat, 2023
- Genus Asiobaetodes Gattolliat, 2012
- Genus Aturbina Lugo-Ortiz & McCafferty, 1996
- Genus Austrocloeon Barnard, 1932 accepted as Cloeon Leach, 1815
- Genus Austrocloeon Barnard, 1940 accepted as Cloeon Leach, 1815
- Genus Baetiella Uéno, 1931 accepted as Baetis Leach, 1815
- Genus Baetis Leach, 1815
- Genus Baëtis Leach, 1815 accepted as Baetis Leach, 1815
- Genus Baetodes Needham & Murphy, 1924
- Genus Baetopus
- Genus Barbaetis Waltz & McCafferty in Waltz, McCafferty & Kennedy, 1985
- Genus Barnumus McCafferty & Lugo-Ortiz in Lugo-Ortiz & McCafferty, 1998
- Genus Bernerius Waltz & McCafferty, 1987
- Genus Boetis Adelung, 1903 accepted as Baetis Leach, 1815
- Genus Brachyphlebia Westwood, 1840 accepted as Baetis Leach, 1815
- Genus Branchiobaetis Kaltenbach, Kluge & Gattolliat, 2022
- Genus Bugilliesia Lugo-Ortiz & McCafferty, 1997
- Genus Bungona Harker, 1957
- Genus Callibaetis Eaton, 1881
- Genus Callibaetoides Cruz, Salles & Hamada, 2013
- Genus Camelobaetidius Demoulin, 1966
- Genus Caribaetis Kluge, 1992 accepted as Fallceon Waltz & McCafferty, 1987
- Genus Centroptella Braasch & Soldán, 1980
- Genus Centroptiloides Lestage, 1919
- Genus Centroptilum Eaton, 1869
- Genus Chane Nieto, 2003
- Genus Cheleocloeon Wuillot & Gillies, 1994
- Genus Chloe Agassiz, 1846 accepted as Cloeon Leach, 1815
- Genus Chloë Agassiz, 1846 accepted as Cloeon Leach, 1815
- Genus Chloeon Lubbock, 1863 accepted as Cloeon Leach, 1815
- Genus Chloëon Lubbock, 1863 accepted as Cloeon Leach, 1815
- Genus Chloeopsis Causard, 1896 accepted as Cloeopsis Eaton, 1866
- Genus Chopralla Waltz & McCafferty, 1987 accepted as Centroptella Braasch & Soldán, 1980
- Genus Cleon Samouelle, 1819 accepted as Cloeon Leach, 1815
- Genus Cleon Leach, 1815
- Genus Cloe Burmeister, 1839 accepted as Cloeon Leach, 1815
- Genus Cloë Burmeister, 1839 accepted as Cloe Burmeister, 1839
- Genus Cloeodes Traver, 1938
- Genus Cloeon Leach, 1815
- Genus Cloëon Leach, 1815 accepted as Cloeon Leach, 1815
- Genus Cloeopsis Eaton, 1866 accepted as Cloeon Leach, 1815
- Genus Cloëopsis Eaton, 1866 accepted as Cloeopsis Eaton, 1866
- Genus Cloeoptilum Kazlauskas, 1972
- Genus Corinna Dominique & Thomas, 2005
- Genus Corinnella Thomas & Dominique, 2006
- Genus Crassabwa Lugo-Ortiz & McCafferty, 1996
- Genus Crassolus Salles, Gattolliat & Sartori, 2015 accepted as Centroptella Braasch & Soldán, 1980
- Genus Cryptonympha Lugo-Ortiz & McCafferty, 1998
- Genus Cunhaporanga Cruz, Salles & Hamada, 2017 accepted as Callibaetis Eaton, 1881
- Genus Cymbalcloeon Suttinun, Gattolliat & Boonsoong, 2020
- Genus Cymulabaetis McCafferty & Waltz, 1995 accepted as Pseudocloeon Klapálek, 1905
- Genus Dabulamanzia Lugo-Ortiz & McCafferty, 1996
- Genus Dactylobaetis Traver & Edmunds, 1968 accepted as Camelobaetidius Demoulin, 1966
- Genus Deceptiviosa Lugo-Ortiz & McCafferty, 1999
- Genus Delouardus Lugo-Ortiz & McCafferty, 1999
- Genus Demoreptus Lugo-Ortiz & McCafferty, 1997
- Genus Demoulinia Gillies, 1990
- Genus Dicentroptilum Wuillot & Gilli, 1994
- Genus Diphetor Waltz & McCafferty, 1987
- Genus Echinobaetis Mol, 1989
- Genus Echinopus Gattolliat, 2002
- Genus Edmulmeatus Lugo-Ortiz & McCafferty, 1997
- Genus Edmundsiops Lugo-Ortiz & McCafferty, 1999
- Genus Fallceon Waltz & McCafferty, 1987
- Genus Glossidion Lugo-Ortiz & McCafferty, 1998
- Genus Gratia Thomas, 1992
- Genus Guajirolus Flowers, 1985
- Genus Guloptiloides Gattolliat & Sartori, 2000
- Genus Haplobaetis Navás, 1922 accepted as Centroptiloides Lestage, 1919
- Genus Harpagobaetis Mol, 1986
- Genus Hemipannota Elouard & Gillies in Elouard, Gillies & Wuillot, 1990 accepted as Pseudopannota Waltz & McCafferty, 1987
- Genus Herbrossus McCafferty & Lugo-Ortiz in Lugo-Ortiz & McCafferty, 1998
- Genus Heterocloeon McDunnough, 1925
- Genus Hindocleon Kluge & Suttinun, 2020
- Genus Holobaetis Sukatskene accepted as Baetis Leach, 1815
- Genus Iguaira Salles & Lugo-Ortiz, 2003
- Genus Indobaetis Müller-Liebenau & Morihara, 1982
- Genus Indocloeon Müller-Liebenau, 1982
- Genus Intercloeon Kluge & Novikova, 1992 accepted as Cloeon Leach, 1815
- Genus Iswaeon McCafferty & Webb in McCafferty, Waltz, Webb & Jacobus, 2005 accepted as Heterocloeon McDunnough, 1925
- Genus Jubabaetis Müller-Liebenau, 1980
- Genus Jubilatum McCafferty & Jacobus in McCafferty, Waltz, Webb & Jacobus, 2005 accepted as Heterocloeon McDunnough, 1925
- Genus Kirmaushenkreena McCafferty, 2011
- Genus Kivua Lugo-Ortiz & McCafferty, 1997
- Genus Kivuiops Lugo-Ortiz & McCafferty, 2007
- Genus Labiobaetis Novikova & Kluge, 1987 accepted as Pseudocloeon Klapálek, 1905
- Genus Liebebiella Waltz & McCafferty, 1987
- Genus Lugoiops McCafferty & Baumgardner, 2003
- Genus Macuxi Cruz, Salles, Hamada & Falcão, 2020
- Genus Madaechinopus Gattolliat & Jacobus, 2010
- Genus Maliqua Lugo-Ortiz & McCafferty, 1997
- Genus Margobaetis Kang & Yang in Kang, Chang & Yang, 1994 accepted as Nigrobaetis Novikova & Kluge, 1987
- Genus Matsumuracloeon Hubbard, 1989
- Genus Mayobaetis Waltz & McCafferty, 1985
- Genus Megabranchiella Phlai-ngam & Tungpairojwong, 2022
- Genus Megalabiops Kaltenbach & Gattolliat, 2021
- Genus Mesobaetis Brauer, Redtenbacher & Ganglbauer, 1889
- Genus Micksiops McCafferty, Lugo-Ortiz & Barber-James, 1997
- Genus Monilistylus Kluge, 2020 accepted as Procloeon Bengtsson, 1915
- Genus Monocentroptilum Kluge, 2019
- Genus Montobaetis Kazlauskas accepted as Baetis Leach, 1815
- Genus Moribaetis Waltz & McCafferty, 1985
- Genus Mullerbaetis Kang & Yang in Kang, Chang & Yang, 1994 accepted as Pseudocloeon Klapálek, 1905
- Genus Mutelocloeon Gillies & Elouard, 1989
- Genus Mystaxiops McCafferty & Sun, 2005
- Genus Nanomis Lugo-Ortiz & McCafferty, 1999
- Genus Neobaetiella Müller-Liebenau, 1985 accepted as Baetis Leach, 1815
- Genus Neobaetis Navás, 1924 accepted as Callibaetis Eaton, 1881
- Genus Nesoptiloides Demoulin, 1973
- Genus Nesydemius Lugo-Ortiz & McCafferty, 1998
- Genus Nigrobaetis Novikova & Kluge, 1987
- Genus Notobaetis Morihara & Edmunds, 1980 accepted as Cloeodes Traver, 1938
- Genus Novokivua Özdikmen, 2008 accepted as Kivuiops Lugo-Ortiz & McCafferty, 2007
- Genus Oculogaster Kluge, 2016 accepted as Procloeon Bengtsson, 1915
- Genus Offadens Lugo-Ortiz & McCafferty, 1998
- Genus Ophelmatostoma Waltz & McCafferty, 1987
- Genus Palaeocloeon Kluge, 1997 †
- Genus Paleobaetodes Brito
- Genus Papuafiliola Kaltenbach, Kluge & Gattolliat, 2025 accepted as Papuanatula Lugo-Ortiz & McCafferty, 1999
- Genus Papuanatula Lugo-Ortiz & McCafferty, 1999
- Genus Paracloeodes Day, 1955
- Genus Parakari Nieto & Derka, 2011
- Genus Patites Thomas & Dia, 1999 accepted as Baetis Leach, 1815
- Genus Pedicelliops Kaltenbach & Gattolliat, 2020
- Genus Peuhlella Lugo-Ortiz & McCafferty, 1998
- Genus Philibaetis Kaltenbach & Gattolliat, 2021
- Genus Platybaetis Müller-Liebenau, 1980
- Genus Platycloeon Gillies & Wuillot, 1997 accepted as Acanthiops Waltz & McCafferty, 1987
- Genus Plauditus Lugo-Ortiz & McCafferty, 1998
- Genus Potamocloeon Gillies, 1990
- Genus Prebaetodes Lugo-Ortiz & McCafferty, 1996
- Genus Procerobaetis Kaltenbach & Gattolliat, 2020
- Genus Procloeon Bengtsson, 1915
- Genus Procloeon Matsumura, 1931 accepted as Promatsumura Hubbard, 1988
- Genus Procloëon Bengtsson, 1915 accepted as Procloeon Bengtsson, 1915
- Genus Procloëon Matsumura, 1931 accepted as Procloeon Matsumura, 1931
- Genus Promatsumura Hubbard, 1988
- Genus Psammonella Glazaczow in Jacob & Glazaczow, 1986 accepted as Pseudocentroptiloides Jacob in Jacob & Glazaczow, 1986
- Genus Pseudocentroptiloides Jacob in Jacob & Glazaczow, 1986
- Genus Pseudocentroptilum Bogoescu
- Genus Pseudocloeon Klapálek, 1905
- Genus Pseudocloeon Bengtsson, 1914 accepted as Procloeon Bengtsson, 1915
- Genus Pseudocloeon Matsumura, 1931 accepted as Matsumuracloeon Hubbard, 1989
- Genus Pseudocloëon Klapálek, 1905 accepted as Pseudocloeon Klapálek, 1905
- Genus Pseudocloëon Bengtsson, 1914 accepted as Pseudocloeon Bengtsson, 1914
- Genus Pseudocloëon Matsumura, 1931 accepted as Pseudocloeon Matsumura, 1931
- Genus Pseudopannota Waltz & McCafferty, 1987
- Genus Raptobaetopus Müller-Liebenau, 1978 accepted as Baetopus
- Genus Rheobaetis Müller-Liebenau, 1974 accepted as Heterocloeon McDunnough, 1925
- Genus Rheoptilum Gattolliat, 2001
- Genus Rhithrocloeon Gillies, 1985
- Genus Rhodobaetis Jacob, 2003 accepted as Baetis Leach, 1815
- Genus Rhopyscelis Cruz, Salles & Hamada, 2018 accepted as Callibaetis Eaton, 1881
- Genus Rivudiva Lugo-Ortiz & McCafferty, 1998
- Genus Scutoptilum Gattolliat, 2002
- Genus Securiops Jacobus, McCafferty & Gattolliat, 2006
- Genus Similicloeon Kluge & Novikova, 1992 accepted as Cloeon Leach, 1815
- Genus Spiritiops Lugo-Ortiz & McCafferty, 1998
- Genus Susua Lugo-Ortiz & McCafferty, 1998
- Genus Symbiocloeon Müller-Liebenau in Müller-Liebenau & Heard, 1979
- Genus Takobia Novikova & Kluge, 1987
- Genus Tanzaniella Gillies, 1991 accepted as Tanzaniops McCafferty & Barber-James, 2005
- Genus Tanzaniops McCafferty & Barber-James, 2005
- Genus Tapajobaetis Boldrini & Salles in Boldrini et al., 2017
- Genus Tatubaetis Kang & Yang in Kang, Chang & Yang, 1994 accepted as Baetis Leach, 1815
- Genus Tenuibaetis Kang & Yang in Kang, Chang & Yang, 1994
- Species Tenuibaetis arduus (Kang & Yang, 1994)
- Species Tenuibaetis inornaturs (Kang & Yang, 1994)
- Species Tenuibaetis pseudofrequentus (Müller-Liebenau, 1985)
- Genus Tomedontus Lugo-Ortiz & McCafferty, 1995
- Genus Tupiara Salles, Lugo-Ortiz, Da-Silva & Francischetti, 2003
- Genus Varipes Lugo-Ortiz & McCafferty, 1998
- Genus Vernobaetis Kazlauskas accepted as Baetis Leach, 1815
- Genus Vetuformosa Poinar, 2011 †
- Genus Waynokiops Hill, Pfeiffer & Jacobus, 2010
- 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
- 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 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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