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
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Subphylum Cephalochordata
- Subphylum Tunicata accepted as Urochordata
- Subphylum Urochordata
- Subphylum Vertebrata
- Superclass Tetrapoda
- Class Acanthodii †
- Class Actinopterygii
- Order Acanthomorpha
- Order Acipenseriformes
- Order Actinopterygii (awaiting allocation)
- Order Actinopterygii incertae sedis
- Order Aeduelliformes †
- Order Albuliformes
- Order Alepisauriformes
- Order Amiiformes
- Order Anguilliformes
- Order Ankylophoriformes †
- Order Argentiniformes
- Order Asarotiformes †
- Order Ascalaboidiformes †
- Order Aspidorhynchiformes †
- Order Ateleopodiformes
- Order Atheriniformes
- Order Aulopiformes
- Order Batrachoidiformes
- Order Beloniformes
- Order Beryciformes
- Order Bobasatraniformes † accepted as Bobasatraniiformes †
- Order Bobasatraniiformes †
- Order Catervarioliformes †
- Order Cephaloxeniformes †
- Order Cetomimiformes
- Order Characiformes
- Order Cheirolepiformes †
- Order Clupeiformes
- Order Clupeocephala incertae sedis
- Order Clupeomorpha incertae sedis
- Order Crossognathiformes †
- Order Ctenothrissiformes †
- Order Cypriniformes
- Order Cyprinodontiformes
- Order Dactylopteriformes accepted as Syngnathiformes
- Order Dapediiformes †
- Order Discordichthyiformes †
- Order Dorsetichthyiformes †
- Order Dorypteriformes †
- Order Ellimmichthyiformes †
- Order Elonichthyiformes †
- Order Elopiformes
- Order Esociformes
- Order Eurynotoidiformes †
- Order Euteleostei incertae sedis
- Order Gadiformes
- Order Gasterosteiformes
- Order Gobiesociformes
- Order Gobiiformes
- Order Gonorhynchiformes accepted as Gonorynchiformes
- Order Gonorynchiformes
- Order Guildayichthyiformes †
- Order Gymnotiformes
- Order Halecomorphi incertae sedis
- Order Haplolepidiformes †
- Order Holocentriformes
- Order Ichthyodectiformes †
- Order Ionoscopiformes †
- Order Kyphosichthyiformes †
- Order Lampriformes
- Order Lepisosteiformes
- Order Leptolepidiformes †
- Order Lophiiformes
- Order Louwoichthyiformes †
- Order Luganoiiformes †
- Order Lycopteriformes †
- Order Macrosemiiformes †
- Order Megalopiformes accepted as Elopiformes
- Order Mormyriformes accepted as Osteoglossiformes
- Order Myctophiformes
- Order Neopterygii incertae sedis
- Order Notacanthiformes
- Order Ophidiiformes
- Order Ophiopsiformes †
- Order Ophisthomi †
- Order Osmeriformes
- Order Osteoglossiformes
- Order Osteoglossomorpha incertae sedis
- Order Pachycormiformes †
- Order Palaeonisciformes †
- Order Palaeoniscimorpha incertae sedis
- Order Palaeoniscoidea † accepted as Palaeonisciformes †
- Order Paleonisciformes † accepted as Palaeonisciformes †
- Order Panxianichthyformes †
- Order Paphosisciformes †
- Order Parasemionotiformes †
- Order Pattersonichthyiformes †
- Order Peltopleuriformes †
- Order Perciformes
- Family Acanthoclinidae Gunther, 1861 accepted as Plesiopidae Gunther, 1861
- Family Acanthuridae Bonaparte, 1835
- Family Acropomatidae Gill, 1893
- Family Aenigmachannidae Britz, Dahanukar, Anoop, Philip, Clark, Raghavan & Ruber, 2020
- Family Amarsipidae Haedrich, 1969
- Family Ambassidae Klunzinger, 1870
- Family Ammodytidae Bonaparte, 1835
- Family Amphistiidae †
- Family Anabantidae Bonaparte, 1831
- Family Anarhichadidae Bonaparte, 1835
- Family Anarhichatidae accepted as Anarhichadidae Bonaparte, 1835
- Family Anisochromidae Smith, 1954 accepted as Pseudochromidae Müller & Troschel, 1849
- Family Aplodactylidae Gunther, 1859
- Family Apogonidae Gunther, 1859
- Family Ariommatidae Haedrich, 1967
- Family Arripidae Gill, 1893
- Family Artedidraconidae Andriashev, 1967
- Family Asianthidae Sytchevskaya & Prokofiev, 2003 †
- Family Badidae Barlow, Liem & Wickler, 1968
- Family Banjosidae Jordan & THompson, 1912
- Family Bathyclupeidae Gill, 1896
- Family Bathydraconidae Regan, 1913
- Family Bathymasteridae Jordan & Gilbert, 1883
- Family Belontiidae Liem, 1962 accepted as Osphronemidae van der Hoeven, 1832
- Family Blenniidae Rafinesque, 1810
- Family Blochiidae †
- Family Bovichthyidae accepted as Bovichtidae Gill, 1862
- Family Bovichtidae Gill, 1862
- Family Bramidae Bonaparte, 1831
- Family Branchiostegidae Jordan, 1923 accepted as Malacanthidae Poey, 1861
- Family Caesionidae Bonaparte, 1831
- Family Caesioscorpididae Parenti & Randall, 2020
- Family Callanthiidae Ogilby, 1899
- Family Callionymidae Bonaparte, 1831
- Family Caproidae Bonaparte, 1835
- Family Carangidae Rafinesque, 1815
- Family Caristiidae Gill & Smith, 1905
- Family Centracanthidae Gill, 1893
- Family Centrarchidae Bleeker, 1859
- Family Centrogeniidae Fowler, 1907 accepted as Centrogenyidae Fowler, 1907
- Family Centrogenyidae Fowler, 1907
- Family Centrolophidae Bonaparte, 1846
- Family Centropomidae Poey, 1867
- Family Cepolidae Rafinesque, 1815
- Family Chaenichthyidae Gill, 1861 accepted as Channichthyidae Gill, 1861
- Family Chaenopsidae Gill, 1865
- Family Chaetodontidae Rafinesque, 1815
- Family Champsodontidae Jordan & Snyder, 1902
- Family Chandidae Fowler, 1905 accepted as Ambassidae Klunzinger, 1870
- Family Channichthyidae Gill, 1861
- Family Channichtyidae accepted as Channichthyidae Gill, 1861
- Family Channidae Fowler, 1934
- Family Cheilodactylidae Bonaparte, 1850
- Family Cheimarrhichthyidae accepted as Cheimarrichthyidae Regan, 1913
- Family Cheimarrichthyidae Regan, 1913
- Family Chiasmodontidae Jordan & Gilbert, 1883
- Family Chironemidae Gill, 1862
- Family Cichlidae Bonaparte, 1835
- Genus Abactochromis Oliver & Arnegard, 2010
- Genus Acara Heckel, 1840 accepted as Astronotus Swainson, 1839
- Genus Acarichthys Eigenmann, 1912
- Genus Acaronia Myers, 1940
- Genus Acaropsis Steindachner, 1875 accepted as Acaronia Myers, 1940
- Genus Acharnes Müller & Troschel, 1849 accepted as Cichla Bloch & Schneider, 1801
- Genus Aequidens Eigenmann & Bray, 1894
- Genus Alcolapia Thys van den Audenaerde, 1969
- Genus Allochromis Greenwood, 1980
- Genus Alticorpus Stauffer & McKaye, 1988
- Genus Altolamprologus Poll, 1986
- Genus Amatitlania Schmitter-Soto, 2007
- Genus Amphilophus Agassiz, 1859
- Genus Andinoacara Musilová, Říĉan & Novák, 2009
- Genus Anomalochromis Greenwood, 1985
- Genus Apistogramma Regan, 1913
- Genus Apistogrammoides Meinken, 1965
- Genus Apistrogramma accepted as Apistogramma Regan, 1913
- Genus Archocentrus Gill in Gill & Bransford, 1877
- Genus Aristochromis Trewavas, 1935
- Genus Asprotilapia Boulenger, 1901 accepted as Xenotilapia Boulenger, 1899
- Genus Astatheros Pellegrin, 1904 accepted as Amphilophus Agassiz, 1859
- Genus Astatilapia accepted as Astatotilapia Pellegrin, 1904
- Genus Astatore accepted as Astatoreochromis Pellegrin, 1904
- Genus Astatoreochromis Pellegrin, 1904
- Genus Astatotilapia Pellegrin, 1904
- Genus Astronotus Swainson, 1839
- Genus Aulonocara Regan, 1922
- Genus Aulonocranus Regan, 1920
- Genus Australoheros Rícan & Kullander, 2006
- Genus Baileychromis Poll, 1986
- Genus Baiodon Agassiz, 1859
- Genus Baionia accepted as Macropleurodus Regan, 1922
- Genus Barombia Trewavas, 1962 accepted as Pungu Trewavas in Trewavas, Green & Corbet, 1972
- Genus Bathracops accepted as Crenicichla Heckel, 1840
- Genus Bathybates Boulenger, 1898
- Genus Batrachops Heckel, 1840 accepted as Crenicichla Heckel, 1840
- Genus Bayonia Boulenger, 1911 accepted as Macropleurodus Regan, 1922
- Genus Benitochromis Lamboj, 2001
- Genus Benthochromis Poll, 1986
- Genus Biotodoma Eigenmann & Kennedy, 1903
- Genus Biotoecus Eigenmann & Kennedy, 1903
- Genus Boggiania Perugia, 1897 accepted as Crenicichla Heckel, 1840
- Genus Boulengerochromis Pellegrin, 1904
- Genus Buccochromis Eccles & Trewavas, 1989
- Genus Bujurquina Kullander, 1986
- Genus Bussingius Schmitter-Soto, 2007 accepted as Cryptoheros Allgayer, 2001
- Genus Callochromis Regan, 1920
- Genus Callopharynx Poll, 1948 accepted as Cyclopharynx Poll, 1948
- Genus Caprichromis Eccles & Trewavas, 1989
- Genus Caquetaia Fowler, 1945
- Genus Caquetia accepted as Caquetaia Fowler, 1945
- Genus Cardiopharynx Poll, 1942
- Genus Chaetobranchopsis Steindachner, 1875
- Genus Chaetobranchus Heckel, 1840
- Genus Chaetolabrus Swainson, 1839 accepted as Etroplus Cuvier in Cuvier & Valenciennes, 1830
- Genus Chalinochromis Poll, 1974
- Genus Champsochromis Boulenger, 1915
- Genus Cheilochromis Eccles & Trewavas, 1989
- Genus Chetia Trewavas, 1961
- Genus Chiapaheros McMahan & Piller, 2015
- Genus Chilochromis Boulenger, 1902
- Genus Chilotilapia Boulenger, 1908
- Genus Chocoheros Říčan & Piálek, 2016
- Genus Chortiheros Říčan & Dragová, 2016
- Genus Christyella Trewavas, 1935 accepted as Gephyrochromis Boulenger, 1901
- Genus Chromichthys Guichenot in Duméril, 1861 accepted as Hemichromis Peters, 1857
- Genus Chromidotilapia Boulenger, 1898
- Genus Chromis Günther, 1862 accepted as Tilapia Smith, 1840
- Genus Chromys Jobert, 1877 accepted as Chromis Cuvier, 1814
- Genus Chuco Fernández-Yépez, 1969 accepted as Theraps Günther, 1862
- Genus Cichla Bloch & Schneider, 1801
- Genus Cichlasoma Swainson, 1839
- Genus Cichlaurus Swainson, 1839 accepted as Cichlasoma Swainson, 1839
- Genus Cichlosoma Regan, 1905 accepted as Cichlasoma Swainson, 1839
- Genus Cincelichthys McMahan & Piller, 2015
- Genus Cleithracara Kullander & Nijssen, 1989
- Genus Cleithrochromis Eccles in Axelrod, 1974 accepted as Alticorpus Stauffer & McKaye, 1988
- Genus Cleptochromis Greenwood, 1980 accepted as Haplochromis Hilgendorf, 1888
- Genus Clinodon Regan, 1920 accepted as Haplochromis Hilgendorf, 1888
- Genus Cnestrostoma Regan, 1920 accepted as Haplochromis Hilgendorf, 1888
- Genus Coelotilapia Mayland, 1995 accepted as Tilapia Smith, 1840
- Genus Coelotilapia Dunz & Schliewen, 2013
- Genus Congochromis Stiassny & Schliewen, 2007
- Genus Congolapia Dunz, Vreven & Schliewen, 2012
- Genus Copadichromis Eccles & Trewavas, 1989
- Genus Copora Fernández-Yépez, 1969 accepted as Hypsophrys Agassiz, 1859
- Genus Coptodon Gervais, 1853 accepted as Tilapia Smith, 1840
- Genus Coptodus Gervais, 1852 accepted as Coptodon Gervais, 1853
- Genus Corematodus Boulenger, 1897
- Genus Crenacara Regan, 1905 accepted as Crenicara Steindachner, 1875
- Genus Crenicara Steindachner, 1875
- Genus Crenicichla Heckel, 1840
- Genus Cribroheros Říčan & Piálek, 2016
- Genus Cryptoheros Allgayer, 2001
- Genus Ctenochromis Pfeffer, 1893
- Genus Ctenopharynx Eccles & Trewavas, 1989
- Genus Cunningtonia Boulenger, 1906
- Genus Curraichthys Fernández-Yépez, 1969 accepted as Amphilophus Agassiz, 1859
- Genus Cyathochromis Trewavas, 1935
- Genus Cyathopharynx Regan, 1920
- Genus Cychla Spix, 1831 accepted as Cichla Bloch & Schneider, 1801
- Genus Cychlasoma Gill, 1858 accepted as Aequidens Eigenmann & Bray, 1894
- Genus Cycla accepted as Cichla Bloch & Schneider, 1801
- Genus Cyclopharynx Poll, 1948
- Genus Cynotilapia Regan, 1922
- Genus Cyphotilapia Regan, 1920
- Genus Cyprichromis Scheuermann, 1977
- Genus Cyrtocara Boulenger, 1902
- Genus Dagetia Thys van den Audenaerde, 1969 accepted as Tilapia Smith, 1840
- Genus Danakilia Thys van den Audenaerde, 1969
- Genus Darienheros Říčan & Novák, 2016
- Genus Dicrossus Kullander, 1990
- Genus Dicrossus Steindachner, 1875
- Genus Dimidiochromis Eccles & Trewavas, 1989
- Genus Diplotaxodon Trewavas, 1935
- Genus Divandu Lamboj & Snoeks, 2000
- Genus Docimodus Boulenger, 1897
- Genus Eclectochromis Eccles & Trewavas, 1989
- Genus Ectodus Boulenger, 1898
- Genus Enantiopus Boulenger, 1906
- Genus Enigmatochromis Lamboj, 2009
- Genus Enterochromis Greenwood, 1980 accepted as Haplochromis Hilgendorf, 1888
- Genus Eretmodus Boulenger, 1898
- Genus Erythrichthus Meek, 1907 accepted as Amphilophus Agassiz, 1859
- Genus Etia Schliewen & Stiassny, 2003
- Genus Etroplus Cuvier in Cuvier & Valenciennes, 1830
- Genus Exochochromis Eccles & Trewavas, 1989
- Genus Fossorochromis Eccles & Trewavas, 1989
- Genus Gaurochromis Greenwood, 1980
- Genus Genyochromis Trewavas, 1935
- Genus Geophagus Heckel, 1840
- Genus Gephyrochromis Boulenger, 1901
- Genus Gnathochromis Poll, 1981
- Genus Gobiochromis Poll, 1939 accepted as Steatocranus Boulenger, 1899
- Genus Gobiocichla Kanazawa, 1951
- Genus Grammatotria Boulenger, 1899
- Genus Greenwoodochromis Poll, 1983
- Genus Guianacara Kullander & Nijssen, 1989
- Genus Gymnogeophagus Miranda Ribeiro, 1918
- Genus Haligenes Günther, 1860 accepted as Tilapia Smith, 1840
- Genus Haplochrmomis accepted as Gnathochromis Poll, 1981
- Genus Haplochromis Hilgendorf, 1888
- Genus Haplotaxodon Boulenger, 1906
- Genus Harpagchromis accepted as Haplochromis Hilgendorf, 1888
- Genus Harpagochromis Greenwood, 1980 accepted as Haplochromis Hilgendorf, 1888
- Genus Hemibates Regan, 1920
- Genus Hemichromis Peters, 1857
- Genus Hemihaplochromis Wickler, 1963 accepted as Pseudocrenilabrus Fowler, 1934
- Genus Hemitaeniochromis Eccles & Trewavas, 1989
- Genus Hemitilapia Boulenger, 1902
- Genus Herichthys Baird & Girard, 1854
- Genus Heroina Kullander, 1996
- Genus Heros Heckel, 1840
- Genus Herotilapia Pellegrin, 1904 accepted as Archocentrus Gill in Gill & Bransford, 1877
- Genus Heterochromis Regan, 1922
- Genus Heterogramma Regan, 1906 accepted as Apistogramma Regan, 1913
- Genus Heterogromma accepted as Apistogramma Regan, 1913
- Genus Heterotilapia Regan, 1920 accepted as Tilapia Smith, 1840
- Genus Heterotilapia Pellegrin, 1904 accepted as Herotilapia Pellegrin, 1904
- Genus Hoplarchus Kaup, 1860
- Genus Hoplotilapia Hilgendorf, 1888
- Genus Hygrogonus Günther, 1862 accepted as Astronotus Swainson, 1839
- Genus Hypselecara Kullander, 1986
- Genus Hypsophrys Agassiz, 1859
- Genus Interochromis Yamaoka, Hori & Kuwamura, 1998
- Genus Iodochromis Mensi, 1973 accepted as Iodotropheus Oliver & Loiselle, 1972
- Genus Iodotropheus Oliver & Loiselle, 1972
- Genus Iranocichla Coad, 1982
- Genus Isthmoheros Říčan & Novák, 2016
- Genus Ivanacara Römer & Hahn, 2007
- Genus Jabarichromis Haefeli, Schedel, Ronco, Indermaur & Salzburger, 2024
- Genus Julidochromis Boulenger, 1898
- Genus Katria Stiassny & Sparks, 2006
- Genus Kihnichthys McMahan & Matamoros, 2015
- Genus Konia Trewavas in Trewavas, Green & Corbet, 1972
- Genus Krobia Kullander & Nijssen, 1989
- Genus Kronoheros Říčan & Piálek, 2016
- Genus Labeotropheus Ahl, 1926
- Genus Labidochromis Trewavas, 1935
- Genus Labrochromis Daget, 1952 accepted as Gobiocichla Kanazawa, 1951
- Genus Labrochromis Regan, 1920 accepted as Gaurochromis Greenwood, 1980
- Genus Laetacara Kullander, 1986
- Genus Lamena Allgayer, 1998 accepted as Paretroplus Bleeker, 1868
- Genus Lamprologus Schilthuis, 1891
- Genus Laruwiala Thys van den Audenaerde, 1969 accepted as Oreochromis Günther, 1889
- Genus Lepidiolamprologus Pellegrin, 1904
- Genus Lepidochromis Poll, 1981 accepted as Greenwoodochromis Poll, 1983
- Genus Leptochromis Regan, 1920 accepted as Reganochromis Whitley, 1929
- Genus Leptolamprologus Pellegrin, 1927 accepted as Teleogramma Boulenger, 1899
- Genus Leptotilapia Pellegrin, 1928 accepted as Steatocranus Boulenger, 1899
- Genus Lestradea Poll, 1943
- Genus Lethrinops Regan, 1922
- Genus Libyachromis Přikryl, Kaur & Murray, 2021 †
- Genus Lichnochromis Trewavas, 1935
- Genus Limbochromis Greenwood, 1987
- Genus Limnochromis Regan, 1920
- Genus Limnotilapia Regan, 1920
- Genus Lipochromis Regan, 1920 accepted as Haplochromis Hilgendorf, 1888
- Genus Lithochromis Lippitsch & Seehausen in Seehausen, Lippitsch, Bouton & Zwennes, 1998
- Genus Lobochilotes Boulenger, 1915
- Genus Lufubuchromis Schedel, Kupriyanov, Katongo & Schliewen, 2020
- Genus Macropleurodus Regan, 1922
- Genus Maravichromis Eccles & Trewavas, 1989
- Genus Maskaheros McMahan & Piller, 2015
- Genus Mayaheros Říčan & Piálek, 2016
- Genus Maylandia Meyer & Förster, 1984
- Genus Mazarunia Kullander, 1990
- Genus Mbipia Lippitsch & Seehausen in Seehausen, Lippitsch, Bouton & Zwennes, 1998
- Genus Mbuna
- Genus Mchenga Stauffer & Konings, 2006
- Genus Melanochromis Trewavas, 1935
- Genus Melanogenes Bleeker, 1863 accepted as Sarotherodon Rüppell, 1852
- Genus Mesoheros McMahan & Chakrabarty, 2015
- Genus Mesonauta Günther, 1862
- Genus Mesops Günther, 1862 accepted as Biotodoma Eigenmann & Kennedy, 1903
- Genus Metriaclima Stauffer, Bowers, Kellogg & McKaye, 1997 accepted as Maylandia Meyer & Förster, 1984
- Genus Microchromis Johnson, 1975
- Genus Microdontochromis Poll, 1986 accepted as Xenotilapia Boulenger, 1899
- Genus Microgaster Swainson, 1839 accepted as Etroplus Cuvier in Cuvier & Valenciennes, 1830
- Genus Microgeophagus Axelrod, 1971 accepted as Mikrogeophagus Meulengracht-Madsen in Schiøtz & Christensen, 1968
- Genus Microgeophagus Frey, 1957 accepted as Mikrogeophagus Meulengracht-Madsen in Schiøtz & Christensen, 1968
- Genus Mikrogeophagus Meulengracht-Madsen in Schiøtz & Christensen, 1968
- Genus Myaka Trewavas in Trewavas, Green & Corbet, 1972
- Genus Mylacochromis Greenwood, 1980 accepted as Gaurochromis Greenwood, 1980
- Genus Mylochromis Regan, 1920
- Genus Naevochromis Eccles & Trewavas, 1989
- Genus Nandopsis Gill, 1862
- Genus Nannacara Miranda Ribeiro, 1918 accepted as Nannacara Regan, 1905
- Genus Nannacara Regan, 1905
- Genus Nannochromis
- Genus Nanochromis Pellegrin, 1904
- Genus Neetroplus Günther, 1867 accepted as Hypsophrys Agassiz, 1859
- Genus Neochromis Regan, 1920
- Genus Neolamprolagus accepted as Lamprologus Schilthuis, 1891
- Genus Neolamprologus Colombé & Allgayer, 1985
- Genus Neopharynx Poll, 1948 accepted as Cyclopharynx Poll, 1948
- Genus Neotilapia Regan, 1920 accepted as Oreochromis Günther, 1889
- Genus Neotrewavasia Ufermann, 2001 accepted as Tilapia Smith, 1840
- Genus Nilotilapia Thys van den Audenaerde in Trewavas, 1983 accepted as Tilapia Smith, 1840
- Genus Nimbochromis Eccles & Trewavas, 1989
- Genus Nosferatu De la Maza-Benignos, Ornelas-Garcia, Lozano-Vilanio, García-Ramírex et al., 2014
- Genus Nyasalapia Thys van den Audenaerde, 1969 accepted as Oreochromis Günther, 1889
- Genus Nyassachromis Eccles & Trewavas, 1989
- Genus Oelemaria Kullander & Nijssen, 1989 accepted as Guianacara Kullander & Nijssen, 1989
- Genus Ophthalmochromis Poll, 1956 accepted as Ophthalmotilapia Pellegrin, 1904
- Genus Ophthalmotilapia Pellegrin, 1904
- Genus Oreochromimos Penk, Altner, Cerwenka, Schliewen & Reichenbacher, 2019 †
- Genus Oreochromis Günther, 1889
- Genus Orthochromis Greenwood, 1954
- Genus Oscura McMahan & Chakrabarty, 2015
- Genus Otopharynx Regan, 1920
- Genus Oxylapia Kiener & Maugé, 1966
- Genus Palaeoplex Schedel, Kupriyanov, Katongo & Schliewen, 2020
- Genus Paleolamprologus Colombé & Allgayer, 1985 accepted as Neolamprologus Colombé & Allgayer, 1985
- Genus Pallidochromis Turner, 1994
- Genus Panamius Schmitter-Soto, 2007 accepted as Cryptoheros Allgayer, 2001
- Genus Pantilapia accepted as Haplochromis Hilgendorf, 1888
- Genus Papiliochromis Kullander, 1977 accepted as Mikrogeophagus Meulengracht-Madsen in Schiøtz & Christensen, 1968
- Genus Papilochromis accepted as Mikrogeophagus Meulengracht-Madsen in Schiøtz & Christensen, 1968
- Genus Paracara Bleeker, 1878 accepted as Paratilapia Bleeker, 1868
- Genus Parachromis Agassiz, 1859
- Genus Parachromis Regan, 1922 accepted as Tristramella Trewavas, 1942
- Genus Paracyprichromis Poll, 1986
- Genus Paragobiocichla Schliewen & Weiss in Weiss et al., 2019
- Genus Paralabidochromis Greenwood, 1956
- Genus Parananochromis Greenwood, 1987
- Genus Paraneetroplus Regan, 1905
- Genus Parapetenia Regan, 1905 accepted as Nandopsis Gill, 1862
- Genus Paratheraps Werner & Stawikowski, 1987 accepted as Paraneetroplus Regan, 1905
- Genus Paratilapia Bleeker, 1868
- Genus Parectodus Poll, 1942 accepted as Xenotilapia Boulenger, 1899
- Genus Paretroplos Hilgendorf, 1888 accepted as Paretroplus Bleeker, 1868
- Genus Paretroplus Bleeker, 1868
- Genus Parvacara Whitley, 1951 accepted as Laetacara Kullander, 1986
- Genus Pelamtochromis accepted as Hemichromis Peters, 1857
- Genus Pelmatochromis Steindachner, 1894
- Genus Pelmatolapia Thys van den Audenaerde, 1969 accepted as Tilapia Smith, 1840
- Genus Pelviacachromis accepted as Pelvicachromis Thys van den Audenaerde, 1968
- Genus Pelvicachromis Thys van den Audenaerde, 1968
- Species Pelvicachromis aureocephalus (Allgayer, 1983) accepted as Nannacara aureocephalus Allgayer, 1983
- Species Pelvicachromis humilis (Boulenger, 1916)
- Species Pelvicachromis pulcher (Boulenger, 1901)
- Species Pelvicachromis roloffi (Thys van den Audenaerde, 1968)
- Species Pelvicachromis rubrolabiatus Lamboj, 2004
- Species Pelvicachromis sacramontis Paulo, 1977 accepted as Pelvicachromis pulcher (Boulenger, 1901)
- Species Pelvicachromis sacrimontis Paulo, 1977 accepted as Pelvicachromis pulcher (Boulenger, 1901)
- Species Pelvicachromis signatus Lamboj, 2004
- Species Pelvicachromis subocellatus (Günther, 1872)
- Species Pelvicachromis taeniatus (Boulenger, 1901)
- Genus Perissodus Boulenger, 1898
- Genus Perrisodus accepted as Petrochromis Boulenger, 1898
- Genus Petenia Günther, 1862
- Genus Petrochromis Boulenger, 1898
- Genus Petrotilapia Trewavas, 1935
- Genus Pharyngochromis Greenwood, 1979
- Genus Pintoichthys Fowler, 1954 accepted as Apistogramma Regan, 1913
- Genus Placidochromis Eccles & Trewavas, 1989
- Genus Plataxoides Castelnau, 1855 accepted as Pterophyllum Heckel, 1840
- Genus Platygnathochromis Eccles & Trewavas, 1989 accepted as Mylochromis Regan, 1920
- Genus Platytaeniodus Boulenger, 1906
- Genus Plecodus Boulenger, 1898
- Genus Plesioheros Perez, Malabarba & del Papa, 2010 †
- Genus Prognathochromis Greenwood, 1980 accepted as Haplochromis Hilgendorf, 1888
- Genus Proterocara Malabarba, Zuleta & del Papa, 2006 †
- Genus Protomelas Eccles & Trewavas, 1989
- Genus Psammochromis Greenwood, 1980 accepted as Haplochromis Hilgendorf, 1888
- Genus Pseudetroplus Bleeker, 1862 accepted as Etroplus Cuvier in Cuvier & Valenciennes, 1830
- Genus Pseudoapistogramma Axelrod, 1971 accepted as Mikrogeophagus Meulengracht-Madsen in Schiøtz & Christensen, 1968
- Genus Pseudocrenilabrus Fowler, 1934
- Genus Pseudogeophagus Hoedeman, 1974 accepted as Mikrogeophagus Meulengracht-Madsen in Schiøtz & Christensen, 1968
- Genus Pseudohaplochromis Allgayer, 1981 accepted as Cheilochromis Eccles & Trewavas, 1989
- Genus Pseudoplesiops Boulenger, 1899 accepted as Nanochromis Pellegrin, 1904
- Genus Pseudosimochromis Nelissen, 1977
- Genus Pseudotropheus Regan, 1922
- Genus Pterochromis Trewavas, 1973
- Genus Pterophillum accepted as Pterophyllum Heckel, 1840
- Genus Pterophyllum Heckel, 1840
- Genus Ptychochromis Steindachner, 1880
- Genus Ptychochromoides Kiener & Maugé, 1966
- Genus Ptyochromis Greenwood, 1980 accepted as Haplochromis Hilgendorf, 1888
- Genus Pundamilia Seehausen & Lippitsch in Seehausen, Lippitsch, Bouton & Zwennes, 1998
- Genus Pungu Trewavas in Trewavas, Green & Corbet, 1972
- Genus Pyxichromis Greenwood, 1980
- Genus Rebekkachromis Kevrekidis, Valtl & Reichenbacher, 2019 †
- Genus Reganochromis Whitley, 1929
- Genus Reganotilapia Whitley, 1950 accepted as Tilapia Smith, 1840
- Genus Retroculus Eigenmann & Bray, 1894
- Genus Rhamphochromis Regan, 1922
- Genus Rheohaplochromis Thys van den Audenaerde, 1963 accepted as Schwetzochromis Poll, 1948
- Genus Rheoheros McMahan & Matamoros, 2015
- Genus Rocio Schmitter-Soto, 2007
- Genus Rondonacara Ottoni & Mattos, 2015
- Genus Rubricatochromis Lamboj & Koblmüller, 2023
- Genus Saraca Steindachner, 1875 accepted as Biotoecus Eigenmann & Kennedy, 1903
- Genus Sargochromis Regan, 1920
- Genus Sarotherodon Rüppell, 1852
- Genus Sarothredon accepted as Sarotherodon Rüppell, 1852
- Genus Satanoperca Heckel
- Genus Satanoperca Günther, 1862
- Genus Schubotzia Boulenger, 1914
- Genus Schwetzochromis Poll, 1948
- Genus Sciaenochromis Eccles & Trewavas, 1989
- Genus Serranochromis Regan, 1920
- Genus Shuja Genner, Ngatunga & Turner, 2022
- Genus Simochromis Boulenger, 1898
- Genus Spathodus Boulenger, 1900
- Genus Stappersetta Whitley, 1950 accepted as Xenotilapia Boulenger, 1899
- Genus Stappersia Boulenger, 1914 accepted as Xenotilapia Boulenger, 1899
- Genus Steatocranus Boulenger, 1899
- Genus Stigmatochromis Eccles & Trewavas, 1989
- Genus Stomalepia accepted as Stomatepia Trewavas, 1962
- Genus Stomatepia Trewavas, 1962
- Genus Symphysodon Heckel, 1840
- Genus Taeniacara Myers, 1935
- Genus Taeniochromis Eccles & Trewavas, 1989
- Genus Taeniolethrinops Eccles & Trewavas, 1989
- Genus Tahuantinsuyoa Kullander, 1986
- Genus Talamancaheros Říčan & Novák, 2016
- Genus Tangachromis Poll, 1981
- Genus Tanganicodus Poll, 1950
- Genus Telapia accepted as Tilapia Smith, 1840
- Genus Teleocichla Kullander, 1988
- Genus Teleogramma Boulenger, 1899
- Genus Telmatochromis Boulenger, 1898
- Genus Telotrematocara Poll, 1986 accepted as Trematocara Boulenger, 1899
- Genus Theraps Günther, 1862
- Genus Thoracochromis Greenwood, 1979
- Genus Thorichthys Meek, 1904
- Genus Thysia Loiselle & Welcomme, 1972 accepted as Thysochromis Daget, 1988
- Genus Thysochromis Daget, 1988
- Genus Tilapia Smith, 1840
- Genus Tomocichla Regan, 1908
- Genus Tramitichromis Eccles & Trewavas, 1989
- Genus Trematocara Boulenger, 1899
- Genus Trematochromis Poll, 1987
- Genus Trematocranus Trewavas, 1935
- Genus Tremembichthys da Silva Santos & Santos, 1993
- Genus Trewavasia Thys van den Audenaerde, 1969 accepted as Tilapia Smith, 1840
- Genus Trichromis McMahan & Chakrabarty, 2015
- Genus Tridontochromis Greenwood, 1980 accepted as Haplochromis Hilgendorf, 1888
- Genus Triglachromis Poll & Thys van den Audenaerde, 1974
- Genus Tristramella Trewavas, 1942
- Genus Tritamella
- Genus Tropheops Trewavas, 1984
- Genus Tropheus Boulenger, 1898
- Genus Tugenchromis Altner, Schliewen, Penk & Reichenbacher, 2017 †
- Genus Tylochromis Regan, 1920
- Genus Tyloschromis
- Genus Tyrannochromis Eccles & Trewavas, 1989
- Genus Uaru Heckel, 1840
- Genus Uarus Cope, 1872 accepted as Uaru Heckel, 1840
- Genus Vallicola Trewavas, 1983 accepted as Oreochromis Günther, 1889
- Genus Variabilichromis Colombé & Allgayer, 1985
- Genus Vieja Fernández-Yépez, 1969
- Genus Wajpamheros Říčan & Piálek, 2016
- Genus Warilochromis Altner, Ruthensteiner & Reichenbacher, 2020 †
- Genus Xenochromis Boulenger, 1899
- Genus Xenotilapia Boulenger, 1899
- Genus Xystichromis Greenwood, 1980 accepted as Haplochromis Hilgendorf, 1888
- Genus Yssichromis Greenwood, 1980
- Family Cirrhitidae MacLeay, 1841
- Family Clinidae Swainson, 1839
- Family Coiidae Fowler, 1905 accepted as Anabantidae Bonaparte, 1831
- Family Congrogadidae Gunther, 1862 accepted as Pseudochromidae Müller & Troschel, 1849
- Family Coracinidae Fowler, 1933 accepted as Dichistiidae Smith, 1935
- Family Coryphaenidae Rafinesque, 1815
- Family Creediidae Waite, 1899
- Family Cryptacanthodidae Gill, 1861
- Family Dactyloscopidae Gill, 1859
- Family Datnioididae Fowler, 1931
- Family Dichistiidae Smith, 1935
- Family Dinolestidae Whitley, 1948
- Family Dinopercidae Heemstra & Hecht, 1986
- Family Draconettidae Jordan & Fowler, 1903
- Family Drepaneidae Gill, 1872
- Family Drepanidae Gill, 1872 accepted as Drepaneidae Gill, 1872
- Family Echeneidae Rafinesque, 1810
- Family Echeneididae accepted as Echeneidae Rafinesque, 1810
- Family Eleginopidae Gill, 1893 accepted as Eleginopsidae Gill, 1893
- Family Eleginopsidae Gill, 1893
- Family Eleotrididae Bonaparte, 1835 accepted as Eleotridae Bonaparte, 1835
- Family Embiotocidae Agassiz, 1853
- Family Emmelichthyidae Poey, 1867
- Family Enoplosidae Gill, 1893
- Family Eocottidae Bannikov, 2004 †
- Family Ephippidae Bleeker, 1859
- Family Ephippididae accepted as Ephippidae Bleeker, 1859
- Family Epigonidae Poey, 1861
- Family Euzaphlegidae †
- Family Formionidae McCulloch, 1929 accepted as Carangidae Rafinesque, 1815
- Family Gadopsidae Gunther, 1862 accepted as Percichthyidae Jordan & Eigenman, 1890
- Family Gempylidae Gill, 1862
- Family Gerreidae Bleeker, 1859
- Family Girellidae Gill, 1862 accepted as Kyphosidae Jordan, 1887
- Family Glaucosomatidae Jordan & Thompson, 1911
- Family Gobioididae Jordan & Eigenmann, 1887 accepted as Gobiidae Cuvier, 1816
- Family Grammatidae Jordan, 1887
- Family Grammistidae Bleeker, 1857 accepted as Serranidae Swainson, 1839
- Family Haemulidae Gill, 1885
- Family Hapalogenyidae Parenti, 2019
- Family Harpagiferidae Gill, 1861
- Family Helostomatidae Gill, 1872
- Family Hemilutjanidae Parenti & Randall, 2020
- Family Howellidae Ogilby, 1899
- Family Icosteidae Jordan & Gilbert, 1880
- Family Inermiidae Jordan, 1923 accepted as Haemulidae Gill, 1885
- Family Istiophoridae Rafinesque, 1815
- Family Kraemeriidae Whitley, 1935
- Family Kuhliidae Jordan & Evermann, 1896
- Family Kurtidae Bleeker, 1859
- Family Kyphosidae Jordan, 1887
- Family Labracoglossidae Regan, 1913 accepted as Kyphosidae Jordan, 1887
- Family Labridae Cuvier, 1816
- Family Labrisomidae Hubbs, 1952
- Family Lactariidae Boulenger, 1904
- Family Lateolabracidae Ghedotti, Davis & Smith, 2018
- Family Latidae Jordan, 1888
- Family Latridae Gill, 1862
- Family Latrididae Gill, 1862 accepted as Latridae Gill, 1862
- Family Leiognathidae Gill, 1893
- Family Leptobramidae Ogilby, 1913
- Family Leptoscopidae Gill, 1859
- Family Lethrinidae Bonaparte, 1831
- Family Limnichthyidae Regan, 1913 accepted as Creediidae Waite, 1899
- Family Lobotidae Gill, 1861
- Family Luciocephalidae Bleeker, 1852 accepted as Osphronemidae van der Hoeven, 1832
- Family Lutianidae accepted as Lutjanidae Gill, 1861
- Family Lutjanidae Gill, 1861
- Family Luvaridae Gill, 1885
- Family Malacanthidae Poey, 1861
- Family Massalongiidae Tyler & Bannikov, 2005 †
- Family Menidae Fitzinger, 1873
- Family Microdesmidae Regan, 1912
- Family Monodactylidae Jordan & Evermann, 1898
- Family Moronidae Jordan & Evermann, 1896
- Family Mugilidae Jarocki, 1822
- Family Mugiloididae Jordan, 1923 accepted as Pinguipedidae Gunther, 1860
- Family Mullidae Rafinesque, 1815
- Family Nandidae Bleeker, 1852
- Family Nardoichthyidae Sorbini & Bannikov, 1991 †
- Family Nematistiidae Gill, 1862
- Family Nemipteridae Regan, 1913
- Family Nomeidae Gunther, 1860
- Family Notograptidae Regan, 1912 accepted as Plesiopidae Gunther, 1861
- Family Nototheniidae Gunther, 1861
- Family Notothenioidei incertae sedis
- Family Odacidae Gunther, 1861
- Family Ophiclinidae Jordan, 1923 accepted as Clinidae Swainson, 1839
- Family Opisthognathidae accepted as Opistognathidae Bonaparte, 1835
- Family Opistognathidae Bonaparte, 1835
- Family Oplegnathidae Bleeker, 1853
- Family Osphronemidae van der Hoeven, 1832
- Family Ostracoberycidae Fowler, 1934
- Family Owstoniidae Jordan, Tanaka & Snyder, 1913 accepted as Cepolidae Rafinesque, 1815
- Family Palaeorhynchidae †
- Family Paleorhynchidae † accepted as Palaeorhynchidae †
- Family Parapercidae Bleeker, 1872 accepted as Pinguipedidae Gunther, 1860
- Family Parascorpididae Smith, 1949
- Family Pempheridae Bleeker, 1859
- Family Pempherididae accepted as Pempheridae Bleeker, 1859
- Family Pentacerotidae Bleeker, 1859
- Family Pentapodidae Fowler, 1933 accepted as Nemipteridae Regan, 1913
- Family Percichthyidae Jordan & Eigenman, 1890
- Family Percidae Rafinesque, 1815
- Family Perciformes (awaiting allocation)
- Family Perciliidae Jordan, 1923
- Family Percoidei incertae sedis
- Family Percophidae Swainson, 1839
- Family Percophididae Gill, 1885 accepted as Percophidae Swainson, 1839
- Family Peronedyidae Jordan, 1923 accepted as Clinidae Swainson, 1839
- Family Pholidae Gill, 1893
- Family Pholidichthyidae Jordan, 1896
- Family Pholidichtyidae accepted as Pholidichthyidae Jordan, 1896
- Family Pholididae Gill, 1893 accepted as Pholidae Gill, 1893
- Family Pinguipedidae Gunther, 1860
- Family Pirskeniidae Obrhelová, 1961 †
- Family Plesiopidae Gunther, 1861
- Family Polycentridae Gill, 1858
- Family Polynemidae Rafinesque, 1815
- Family Polyprionidae Bleeker, 1874
- Family Pomacanthidae Jordan & Evermann, 1898
- Family Pomacentridae Bonaparte, 1831
- Family Pomadasyidae Regan, 1913 accepted as Haemulidae Gill, 1885
- Family Pomatomidae Gill, 1863
- Family Priacanthidae Gunther, 1859
- Family Pristolepididae Regan, 1913
- Family Pseudaphritidae McCulloch, 1929
- Family Pseudochromidae Müller & Troschel, 1849
- Family Pseudogrammatidae Fowler, 1931 accepted as Serranidae Swainson, 1839
- Family Pseudoplesiopidae Bleeker, 1875 accepted as Pseudochromidae Müller & Troschel, 1849
- Family Ptereleotridae Bleeker, 1875 accepted as Microdesmidae Regan, 1912
- Family Ptilichthyidae Jordan & Gilbert, 1883
- Family Rachycentridae Gill, 1896
- Family Repropcidae Bannikov, 1991 †
- Family Rhinoprenidae Munro, 1964 accepted as Ephippidae Bleeker, 1859
- Family Robertanniidae Bannikov, 2011 †
- Family Salwaichthyidae Bannikov, 2020 †
- Family Scaridae Rafinesque, 1810
- Family Scatophagidae Gill, 1883
- Family Schindleriidae Giltay, 1934
- Family Sciaenidae Gill, 1861
- Family Scombridae Rafinesque, 1815
- Family Scombrolabracidae Fowler, 1925
- Family Scombropidae Gill, 1862
- Family Scorpididae Gunther, 1860 accepted as Kyphosidae Jordan, 1887
- Family Scytalinidae Jordan & Starks, 1895
- Family Serranidae Swainson, 1839
- Family Siganidae Richardson, 1837
- Family Sillaginidae Richardson, 1946
- Family Sparidae Rafinesque, 1818
- Family Sphyraenidae Rafinesque, 1815
- Family Stichaeidae Gill, 1864
- Family Stromateidae Rafinesque, 1810
- Family Symphysanodontidae Katayama, 1984
- Family Teraponidae accepted as Terapontidae Richardson, 1842
- Family Terapontidae Richardson, 1842
- Family Tetragonuridae Risso, 1827
- Family Theraponidae Richardson, 1842 accepted as Terapontidae Richardson, 1842
- Family Tortonesiidae Sorbini, Boscaini & Bannikov, 1991 †
- Family Toxotidae Bleeker, 1859
- Family Trachinidae Rafinesque, 1815
- Family Trachinoidei (awaiting allocation)
- Family Trichiuridae Rafinesque, 1810
- Family Trichiuroidei (awaiting allocation)
- Family Trichodontidae Bleeker, 1859
- Family Trichonotidae Gunther, 1861
- Family Tripterygiidae Whitley, 1931
- Family Trispinacidae Nazarkin, 2002 †
- Family Trypauchenidae Gunther, 1861 accepted as Gobiidae Cuvier, 1816
- Family Trypterigionidae Whitley, 1931 accepted as Tripterygiidae Whitley, 1931
- Family Uranoscopidae Bonaparte, 1831
- Family Xenisthmidae Miller, 1973
- Family Xenocephalidae Kaup, 1858 accepted as Uranoscopidae Bonaparte, 1831
- Family Xiphiidae Rafinesque, 1815
- Family Xiphiorhynchidae Regan, 1909 †
- Family Zanclidae Bleeker, 1876
- Family Zaproridae Jordan, 1896
- Family Zoarcidae Swainson, 1839
- Family Zorzinichthyidae Tyler & Bannikov, 2002 †
- Genus Argestichthys Prokofiev, 2002 †
- Genus Cubariomma Bannikov, 2018 †
- Genus Epibatichthys Prokofiev, 2002 †
- Genus Gilmourella Carnevale & Bannikov, 2019 †
- Genus Latellopsis Bannikov & Zorzin, 2019 †
- Genus Quasinectes Bannikov & Zorzin, 2019 †
- Order Percomorpha incertae sedis
- Order Percopsiformes
- Order Perleidiformes †
- Order Pholidophoriformes †
- Order Pholidophoroidea † accepted as Pholidophoriformes †
- Order Pholidopleuriformes †
- Order Pleuronectiformes
- Order Polymixiiformes
- Order Prohaleciteiformes †
- Order Protacanthopterygii incertae sedis
- Order Ptycholepiformes †
- Order Pycnodontiformes †
- Order Redfieldiiformes †
- Order Saccopharyngiformes
- Order Salmoniformes
- Order Saurichthyiformes †
- Order Scanilepiformes †
- Order Scorpaeniformes
- Order Semionotiformes †
- Order Siluriformes
- Order Sorbininardiformes †
- Order Stephanoberyciformes
- Order Stomiiformes
- Order Synbranchiformes
- Order Syngnathiformes
- Order Tarrasiiformes †
- Order Teleostei incertae sedis
- Order Teleostii (awaiting allocation)
- Order Tetraodontiformes
- Order Tselfatiformes accepted as Tselfatiiformes †
- Order Tselfatiiformes †
- Order Zeiformes
- Genus Avitosmerus Fielitz, 2002 †
- Genus Avonichthys Wilson, Pardo & Anderson, 2018 †
- Genus Bacchiaichthys Bannikov & Sorbini, 2000 †
- Genus Bethesdaichthys Bender, 2001 †
- Genus Bluefieldius Mickle, 2018 †
- Genus Choctawichthys Schwarzhans & Stringer in Stringer et al., 2020 †
- Genus Cladistia Cope, 1870
- Genus Diplospondichthys Filleul & Dutheil, 2004 †
- Genus Fuyuanichthys Xu, Ma & Ren, 2018 †
- Genus Gwyneddocaris Bock, 1946 †
- Genus Otolithopsis Huddleston, 1983 †
- Genus Otolithus Koken, 1884 † accepted as Otolithopsis Huddleston, 1983 †
- Class Agnatha (awaiting allocation)
- Class Cephalaspidomorphi
- Class Chondrichthyes
- Class Conodonta †
- Class Dipnoi
- Class Dipnomorpha accepted as Dipnoi
- Class Galeaspida †
- Class Gnathostomata incertae sedis †
- Class Myxini
- Class Osteichthyes (awaiting allocation)
- Class Osteichthyes incertae sedis †
- Class Ostracodermi †
- Class Pisces (awaiting allocation)
- Class Placodermi †
- Class Pteraspidomorphi †
- Class Sarcopterygii
- Class Thelodonti †
- Genus Emmonsaspis Resser & Howell, 1938 †
- Genus Harajicadectes Choo, Holland, Clement, King, Challands, Young & Long, 2024 †
- Genus Kahamachli Malkani, 2019 †
- Genus Nuucichthys Lerosey-Aubril & Ortega-Hernández, 2024 †
- Genus Rhynchocopros Hunt, Lucas & Spielmann, 2013 †
- Genus Santamariacopros Hunt, Lucas & Spielmann, 2013 †
- Genus Squirmarius McCoy, Wittry, Sadabadi & Mayer, 2023 †
- Class Chordata (awaiting allocation)
- Class Eotetrapodiformes incertae sedis
- 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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