Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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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
- 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
- Family Ageneiosidae Bleeker, 1862 accepted as Auchenipteridae Bleeker, 1862
- Family Ailiidae Wang et al., 2016
- Family Akysidae Gill, 1861
- Family Amblycipitidae Day, 1873
- Family Amphiliidae Regan, 1911
- Family Anchariidae Glaw & Vences, 1994
- Family Andinichthyidae Gayet, 1988 †
- Family Ariidae Bleeker, 1858
- Family Aspredinidae Adams, 1854
- Family Astroblepidae Bleeker, 1862
- Family Auchenipteridae Bleeker, 1862
- Family Austroglanididae Mo, 1991
- Family Bagridae Bleeker, 1852
- Family Callichthyidae Gill, 1872
- Family Cetopsidae Bleeker, 1858
- Family Chacidae Bleeker, 1858
- Family Clariidae Bonaparte, 1846
- Genus Allabenchelys Boulenger, 1902 accepted as Clariallabes Boulenger, 1900
- Genus Anguilloclarias Teugels, 1982 accepted as Clarias Scopoli, 1777
- Genus Bathyclarias Jackson, 1959
- Genus Brevicephaloides Teugels, 1982 accepted as Clarias Scopoli, 1777
- Genus Channalabes accepted as Channallabes Günther, 1873
- Genus Channallabes Günther, 1873
- Genus Chlarias Scopoli, 1777 accepted as Clarias Scopoli, 1777
- Genus Clairas Heckel in Russegger, 1849 accepted as Clarias Scopoli, 1777
- Genus Clariallabes Boulenger, 1900
- Genus Clarias Scopoli, 1777
- Genus Clarias Gronow, 1763 accepted as Clarias Scopoli, 1777
- Genus Clarias David, 1935 accepted as Clarias Scopoli, 1777
- Genus Clarioides David in David & Poll, 1937 accepted as Clarias Scopoli, 1777
- Genus Clarioides Teugels, 1982 accepted as Clarias Scopoli, 1777
- Genus Clarius Bleeker, 1858 accepted as Clarias Scopoli, 1777
- Genus Claroides accepted as Clarias Scopoli, 1777
- Genus Cossyphus McClelland, 1844 accepted as Clarias Scopoli, 1777
- Genus Dinopterus Boulenger, 1906 accepted as Dinotopterus Boulenger, 1906
- Genus Dinotopteroides Fowler, 1930 accepted as Clarias Scopoli, 1777
- Genus Dinotopterus Boulenger, 1906
- Genus Dolichallabes Poll, 1942
- Genus Encheloclarias Myers in Herre & Myers, 1937
- Genus Gymnallabes Günther, 1867
- Genus Heterobranchoides David, 1935 accepted as Clarias Scopoli, 1777
- Genus Heterobranchus Cuvier, 1817
- Genus Heterobranchus Geoffroy St. Hilaire, 1809
- Genus Horaglanis Menon, 1950
- Genus Macropteronotus Lacepède, 1803 accepted as Clarias Scopoli, 1777
- Genus Phagorus McClelland, 1844 accepted as Clarias Scopoli, 1777
- Genus Platyallabes Poll, 1977
- Genus Platycephaloides Teugels, 1982 accepted as Clarias Scopoli, 1777
- Genus Platyclarias Poll, 1977
- Genus Prophagorus Smith, 1939 accepted as Clarias Scopoli, 1777
- Species Prophagorus cataractus (Fowler, 1939) accepted as Clarias cataractus (Fowler, 1939)
- Genus Tanganikallabes Poll, 1943
- Genus Uegitglanis Gianferrari, 1923
- Genus Vegitglanis accepted as Uegitglanis Gianferrari, 1923
- Genus Xenoclarias Greenwood, 1958
- Family Claroteidae Bleeker, 1862
- Family Cranoglanididae Myers, 1931
- Family Diplomystidae Eigenman, 1890
- Family Doradidae Bleeker, 1858
- Family Erethistidae Bleeker, 1862
- Family Helogeneidae accepted as Helogenidae Regan, 1911
- Family Helogenidae Regan, 1911 accepted as Cetopsidae Bleeker, 1858
- Family Heptapteridae Gill, 1861
- Family Heteropneustidae Hora, 1936
- Family Horabagridae Jayaram, 2006
- Family Hypophthalmidae Bleeker, 1862 accepted as Pimelodidae Bonaparte, 1835
- Family Hypsidoridae †
- Family Ictaluridae Gill, 1861
- Family Kryptoglanidae Britz, Kakkassery & Raghavan, 2014
- Family Lacantuniidae Rodiles-Hernández, Hendrickson & Lundberg, 2005
- Family Loricariidae Rafinesque, 1815
- Family Malapteruridae Bleeker, 1858
- Family Mochokidae Regan, 1912
- Family Nematogenyidae Bleeker, 1862
- Family Olyridae Gill, 1893
- Family Pangasiidae Bleeker, 1858
- Family Parakysidae Roberts, 1989 accepted as Akysidae Gill, 1861
- Family Pimelodidae Bonaparte, 1835
- Family Plotosidae Bleeker, 1858
- Family Pseudopimelodidae Fernández-Yépez & Antón, 1966
- Family Schilbeidae Bleeker, 1858
- Family Schilbidae accepted as Schilbeidae Bleeker, 1858
- Family Scoloplacidae Bailey & Baskin, 1976
- Family Siluridae Rafinesque, 1815
- Family Siluriformes (awaiting allocation)
- Family Siluriformes incertae sedis
- Family Sisoridae Bleeker, 1858
- Family Trichomycteridae Bleeker, 1858
- Family Vorhisiidae †
- 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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