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
- 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
- Family Abyssocottidae
- Family Agonidae
- Family Anoplopomatidae
- Family Apistidae
- Family Aploactinidae
- Family Bathylutichthyidae
- Family Bathylutichtyidae
- Family Bembridae
- Family Caracanthidae accepted as Scorpaenidae Risso, 1826
- Family Comephoridae
- Family Congiopodidae
- Family Cottidae
- Genus Acanthocottus Girard, 1850 accepted as Myoxocephalus Tilesius, 1811
- Genus Agonocottus Pavlenko, 1910 accepted as Icelus Krøyer, 1845
- Genus Ainocottus Jordan & Starks, 1904 accepted as Myoxocephalus Tilesius, 1811
- Genus Alcichthys Jordan & Starks, 1904
- Genus Alcidea Jordan & Evermann, 1898 accepted as Paricelinus Eigenmann & Eigenmann, 1889
- Genus Allartedius Hubbs, 1926 accepted as Artedius Girard, 1856
- Genus Allocottus Hubbs, 1926 accepted as Clinocottus Gill, 1861
- Genus Alloricuzenius Matsubara & Iwai, 1951 accepted as Ricuzenius Jordan & Starks, 1904
- Genus Andriashevicottus Fedorov, 1990
- Genus Antipodocottus Bolin, 1952
- Genus Aphobus Gistel, 1848 accepted as Trachidermus Heckel, 1839
- Genus Archaulus Gilbert & Burke, 1912 accepted as Archistes Jordan & Gilbert in Jordan & Evermann, 1898
- Genus Archistes Jordan & Gilbert in Jordan & Evermann, 1898
- Genus Argyrocottus Herzenstein, 1892
- Genus Artediellichthys Taranetz, 1941
- Genus Artediellina Taranetz, 1937
- Genus Artedielliscus Neyelov in Fedorov, 1973 accepted as Artediellus Jordan, 1885
- Genus Artediellius accepted as Artediellus Jordan, 1885
- Genus Artedielloides Soldatov, 1922
- Genus Artediellops Neyelov, 1979 accepted as Artediellus Jordan, 1885
- Genus Artediellus Jordan, 1885
- Genus Artedius Girard, 1856
- Genus Ascelichthys Jordan & Gilbert, 1880
- Genus Asemichthys Gilbert, 1912
- Genus Aspicottus Girard, 1854 accepted as Enophrys Swainson, 1839
- Genus Astrocottus Bolin, 1936
- Genus Astrolytes Jordan & Starks, 1895 accepted as Artedius Girard, 1856
- Genus Atopocottus Bolin, 1936
- Genus Axyrias Starks, 1896 accepted as Artedius Girard, 1856
- Genus Bero Jordan & Starks, 1904
- Genus Blennicottus Gill, 1861 accepted as Clinocottus Gill, 1861
- Species Blennicottus acuticeps (Gilbert, 1896) accepted as Clinocottus acuticeps (Gilbert, 1896)
- Species Blennicottus clarki Evermann & Goldsborough, 1907 accepted as Artediellus pacificus Gilbert, 1896
- Species Blennicottus embryum (Jordan & Starks, 1895) accepted as Clinocottus embryum (Jordan & Starks, 1895)
- Species Blennicottus globiceps (Girard, 1858) accepted as Clinocottus globiceps (Girard, 1858)
- Species Blennicottus recalvus Greeley, 1899 accepted as Clinocottus recalvus (Greeley, 1899)
- Genus Bolinia Yabe, 1991
- Genus Boreocottus Gill, 1859 accepted as Myoxocephalus Tilesius, 1811
- Genus Calycilepidotus Ayres, 1855 accepted as Hemilepidotus Cuvier, 1829
- Genus Cattus Anonymous, 1815 accepted as Cottus Linnaeus, 1758
- Genus Centridermichthys Richardson, 1845 accepted as Cottus Linnaeus, 1758
- Genus Cephalocottus Gratzianov, 1907 accepted as Cottus Linnaeus, 1758
- Genus Ceratocottus Gill, 1859 accepted as Enophrys Swainson, 1839
- Genus Chalycelepidotus Kaup, 1858 accepted as Hemilepidotus Cuvier, 1829
- Genus Chitonotus Lockington, 1879
- Genus Clinocottus Gill, 1861
- Genus Clypeocottus Ayres, 1854 accepted as Enophrys Swainson, 1839
- Genus Cottidarum †
- Genus Cottiusculus Schmidt, 1904
- Genus Cottiusculus Jordan & Starks, 1904
- Genus Cottopsis Girard, 1850 accepted as Cottus Linnaeus, 1758
- Genus Cottus Linnaeus, 1758
- Genus Crossias Jordan & Starks, 1904 accepted as Porocottus Gill, 1859
- Genus Crossius accepted as Crossias Jordan & Starks, 1904
- Genus Daruma Jordan & Starks, 1904
- Genus Dialarchus Greeley, 1899 accepted as Oligocottus Girard, 1856
- Genus Elanura Gilbert, 1896 accepted as Triglops Reinhardt, 1830
- Genus Elaphichthys Jordan & Starks, 1904 accepted as Alcichthys Jordan & Starks, 1904
- Genus Elaphocottus Sauvage, 1878 accepted as Gymnocanthus Swainson, 1839
- Genus Enophrys Swainson, 1839
- Genus Evermanniana Taranetz, 1935 accepted as Artediellus Jordan, 1885
- Genus Eximia Greeley, 1899 accepted as Oligocottus Girard, 1856
- Genus Furcina Jordan & Starks, 1904
- Genus Greeleya Jordan, 1920 accepted as Oligocottus Girard, 1856
- Genus Gymnacanthus accepted as Gymnocanthus Swainson, 1839
- Genus Gymnocanthus Swainson, 1839
- Genus Hemilepidotus Cuvier, 1829
- Genus Hoplocottus Kaup, 1858 accepted as Pseudoblennius Temminck & Schlegel in Siebold, 1850
- Genus Icelichthys Schmidt, 1935 accepted as Icelus Krøyer, 1845
- Genus Icelinus Jordan, 1885
- Genus Icelopsis Taranetz, 1936 accepted as Icelus Krøyer, 1845
- Genus Icelus Krøyer, 1845
- Genus Jordania Starks, 1895
- Genus Leiocottus Girard, 1856
- Genus Lepidobero Qin & Jin, 1992
- Genus Leptocottus Girard, 1854
- Genus Littocottus Neyelov, 1979 accepted as Myoxocephalus Tilesius, 1811
- Genus Maoricottus Schwarzhans, 2019 †
- Genus Medicelinus Bolin, 1936 accepted as Icelinus Jordan, 1885
- Genus Megalocottus Gill, 1861
- Genus Melletes Bean, 1880 accepted as Hemilepidotus Cuvier, 1829
- Genus Mesocottus Gratzianov, 1907
- Genus Micrenophrys Andriashev, 1954
- Genus Microcottus Schmidt, 1940
- Genus Montereya Hubbs, 1926 accepted as Clinocottus Gill, 1861
- Genus Myoxocephalus Tilesius, 1811
- Genus Neohemilepidotus Sakamoto, 1932 accepted as Hemilepidotus Cuvier, 1829
- Genus Noviricuzenius Bolin, 1936 accepted as Ricuzenius Jordan & Starks, 1904
- Genus Ochotskia Schmidt, 1916 accepted as Icelus Krøyer, 1845
- Genus Ocynectes Jordan & Starks, 1904
- Genus Oligocottus Girard, 1856
- Genus Onchocottus Gill, 1861 accepted as Myoxocephalus Tilesius, 1811
- Genus Oncocottus Gill, 1861 accepted as Triglopsis Girard, 1851
- Genus Onocottus accepted as Onchocottus Gill, 1861
- Genus Orthonopias Starks & Mann, 1911
- Genus Oxycottus Jordan & Evermann, 1898 accepted as Clinocottus Gill, 1861
- Genus Parartedius Hubbs, 1926 accepted as Artedius Girard, 1856
- Genus Parastrolytes Hubbs, 1926 accepted as Artedius Girard, 1856
- Genus Parenophrys Taranetz, 1941 accepted as Taurulus Gratzianov, 1907
- Genus Paricelinus Eigenmann & Eigenmann, 1889
- Genus Pegedichthys Jordan, 1876 accepted as Cottus Linnaeus, 1758
- Genus Pegedictis Rafinesque, 1820 accepted as Cottus Linnaeus, 1758
- Genus Penicelinus Bolin, 1936 accepted as Icelinus Jordan, 1885
- Genus Phallocottus Schultz, 1938
- Genus Phasmatocottus Bolin, 1936
- Genus Phobetor Krøyer, 1845 accepted as Gymnocanthus Swainson, 1839
- Genus Podabrus Richardson, 1848 accepted as Vellitor Jordan & Starks, 1904
- Genus Porocottus Gill, 1859
- Genus Potamocottus Gill, 1861 accepted as Cottus Linnaeus, 1758
- Genus Prionistius Bean, 1884 accepted as Triglops Reinhardt, 1830
- Genus Pseudoblennius Temminck & Schlegel in Siebold, 1850
- Genus Pseudoclinus Temminck & Schlegel, 1850 accepted as Pseudoblennius Temminck & Schlegel in Siebold, 1850
- Genus Pterygiocottus Bean & Weed, 1920 accepted as Artedius Girard, 1856
- Genus Ptyonotus Günther, 1860 accepted as Myoxocephalus Tilesius, 1811
- Genus Radulinellus Bolin, 1950 accepted as Radulinus Gilbert, 1890
- Genus Radulinopsis Soldatov & Lindberg, 1930
- Genus Radulinus Gilbert, 1890
- Genus Rastrinus Jordan & Evermann, 1896
- Genus Rheopresbe Jordan & Starks, 1904 accepted as Cottus Linnaeus, 1758
- Genus Ricuzenius Jordan & Starks, 1904
- Genus Ruscariops Hubbs, 1926 accepted as Artedius Girard, 1856
- Genus Ruscarius Jordan & Starks, 1895
- Genus Rusciculus Greeley, 1899 accepted as Oligocottus Girard, 1856
- Genus Rusulus Starks & Mann, 1911 accepted as Clinocottus Gill, 1861
- Genus Schmidtia Jordan & Starks, 1904 accepted as Stlengis Jordan & Starks, 1904
- Genus Schmidtina Jordan & Starks, 1904 accepted as Stlengis Jordan & Starks, 1904
- Genus Sclerocottus Fischer, 1885 accepted as Gymnocanthus Swainson, 1839
- Genus Scorpaenichthys Girard, 1854
- Genus Scorpichthes Bonaparte, 1846 accepted as Myoxocephalus Tilesius, 1811
- Genus Sigmistes Rutter in Jordan & Evermann, 1898
- Genus Stelgidinotus accepted as Stelgidonotus Gilbert & Thompson, 1905
- Genus Stelgidonotus Gilbert & Thompson, 1905 accepted as Oligocottus Girard, 1856
- Genus Stelgistrops Hubbs, 1926 accepted as Stelgistrum Jordan & Gilbert in Jordan & Evermann, 1898
- Genus Stelgistrum Jordan & Gilbert in Jordan & Evermann, 1898
- Genus Steligistrum Jordan, 1920 accepted as Stelgistrum Jordan & Gilbert in Jordan & Evermann, 1898
- Genus Sternias Jordan & Evermann, 1898 accepted as Triglops Reinhardt, 1830
- Genus Stlegicottus Bolin, 1936 accepted as Rastrinus Jordan & Evermann, 1896
- Genus Stlengis Jordan & Starks, 1904
- Genus Synchirus Bean, 1890
- Genus Tarandichthys Jordan & Evermann in Jordan, 1896 accepted as Icelinus Jordan, 1885
- Genus Tauridea Jordan & Rice in Jordan, 1878 accepted as Cottus Linnaeus, 1758
- Genus Taurocottus Soldatov & Pavlenko, 1915
- Genus Taurulus Gratzianov, 1907
- Genus Temnistia Richardson, 1836 accepted as Hemilepidotus Cuvier, 1829
- Genus Thyriscus Gilbert & Burke, 1912
- Genus Trachidermis Girard, 1850 accepted as Trachidermus Heckel, 1839
- Genus Trachidermus Heckel, 1839
- Genus Trachydermus Agassiz, 1845 accepted as Trachidermus Heckel, 1839
- Genus Trichocottus Soldatov & Pavlenko, 1915
- Genus Trichostomma
- Genus Triglops Reinhardt, 1830
- Genus Triglopsis Girard, 1851 accepted as Myoxocephalus Tilesius, 1811
- Genus Uranidea DeKay, 1842 accepted as Cottus Linnaeus, 1758
- Genus Uranoscopus Gronow, 1763 accepted as Cottus Linnaeus, 1758
- Genus Vellitor Jordan & Starks, 1904
- Genus Zesticelus Jordan & Evermann, 1896
- Family Cottocomephoridae
- Family Cottunculidae accepted as Psychrolutidae
- Family Cyclopteridae Bonaparte, 1831
- Family Dactylopteridae
- Family Ereuniidae
- Family Eschmeyeridae
- Family Gnathanacanthidae
- Family Hemitripteridae
- Family Hexagrammidae
- Family Hoplichthyidae
- Family Hoplichtyidae
- Family Icelidae accepted as Cottidae
- Family Liparidae Scopoli, 1777
- Family Neosebastidae
- Family Normanichthyidae
- Family Normanichtyidae
- Family Parabembridae
- Family Pataecidae
- Family Peristediidae
- Family Perryenidae Honma, Imamura & Kawai, 2013
- Family Platycephalidae
- Family Plectrogenidae accepted as Plectrogeniidae Gill, 1893
- Family Plectrogeniidae Gill, 1893
- Family Psychrolutidae
- Family Pteroidae accepted as Scorpaenidae Risso, 1826
- Family Pterygocephalidae †
- Family Rhamphocottidae
- Family Scorpaenidae Risso, 1826
- Family Scorpaeniformes (awaiting allocation)
- Family Sebastidae
- Family Setarchidae
- Family Synanceiidae
- Family Synancejidae accepted as Synanceiidae
- Family Tetrarogidae
- Family Triglidae
- Family Zaniolepidae accepted as Hexagrammidae
- Family Zaniolepididae accepted as Hexagrammidae
- 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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