Eschmeyer's Catalog of Fishes Classification

Class Myxini
- Order Myxiniformes
  - Family Myxinidae Rafinesque 1815 (hagfishes)
    - Subfamily Rubicundinae Fernholm, Norén, Kullander, Quattrini et al. 2013 (reddish hagfishes)
    - Subfamily Eptatretinae Bonaparte 1850 (multi-gill hagfishes)
    - Subfamily Myxininae Rafinesque 1815 (hagfishes)

Class Petromyzonti
- Order Petromyzontiformes
  - Family Petromyzontidae Bonaparte 1831 (lampreys)
  - Family Geotriidae Gill 1893 (pouched lampreys)
  - Family Mordaciidae Gill 1893 (southern topeyed lampreys)

Class Elasmobranchii
- Order Hexanchiformes
  - Family Hexanchidae Gray 1851 (cow sharks)
  - Family Chlamydoselachidae Garman 1884 (frill sharks)
- Order Heterodontiformes
  - Family Heterodontidae Gray 1851 (bullhead sharks or horn sharks)
- Order Orectolobiformes
  - Family Rhincodontidae Müller & Henle 1841 (whale sharks)
  - Family Parascylliidae Gill 1862 (collared carpet sharks)
  - Family Brachaeluridae Applegate 1974 (blind sharks)
  - Family Orectolobidae Gill 1896 (wobbegongs)
  - Family Hemiscylliidae Gill 1862 (bamboo sharks)
  - Family Stegostomatidae Gill 1862 (zebra sharks)
  - Family Ginglymostomatidae Gill 1862 (nurse sharks)
- Order Lamniformes
  - Family Mitsukurinidae Jordan 1898 (goblin sharks)
  - Family Carchariidae Müller & Henle 1838 (sand tigers)
  - Family Odontaspididae Müller & Henle 1839 (sand tiger sharks)
  - Family Pseudocarchariidae Taylor, Compagno & Struhsaker 1983 (crocodile sharks)
  - Family Megachasmidae Taylor, Compagno & Struhsaker 1983 (megamouth sharks)
  - Family Alopiidae Bonaparte 1835 (thresher sharks)
  - Family Cetorhinidae Gill 1861 (basking sharks)
  - Family Lamnidae Bonaparte 1835 (mackerel sharks)
- Order Carcharhiniformes
  - Suborder Scyliorhinoidei
    - Family Scyliorhinidae Gill 1862 (catsharks)
  - Suborder Carcharhinoidei
    - Family Atelomycteridae White 1936 (coloured catsharks)
    - Family Pentanchidae Smith 1912 (deepwater catsharks)
    - Family Dichichthyidae White, Stewart, O'Neill & Naylor 2024 (bristle sharks)
    - Family Pseudotriakidae Gill 1893 (false catsharks)
    - Family Proscylliidae Fowler 1941 (finback catsharks)
    - Family Leptochariidae Gray 1851 (barbeled houndsharks)
    - Family Triakidae Gray 1851 (houndsharks)
      - Subfamily Triakinae Gray 1851 (smouth-hounds)
      - Subfamily Galeorhininae Gill 1862 (school sharks)
    - Family Hemigaleidae Hasse 1878 (weasel sharks)
    - Family Carcharhinidae Jordan & Evermann 1896 (requiem sharks)
    - Family Galeocerdonidae Poey 1875 (tiger sharks)
    - Family Sphyrnidae Bonaparte 1840 (hammerhead sharks)
- Order Squaliformes
  - Family Dalatiidae Gray 1851 (kitefin sharks)
  - Family Etmopteridae Fowler 1934 (lantern sharks)
  - Family Somniosidae Jordan 1888 (sleeper sharks)
  - Family Oxynotidae Gill 1863 (rough sharks)
  - Family Centrophoridae Bleeker 1859 (gulper sharks)
  - Family Squalidae Blainville 1816 (dogfish sharks)
- Order Echinorhiniformes
  - Family Echinorhinidae Gill 1862 (bramble sharks)
- Order Pristiophoriformes
  - Family Pristiophoridae Bleeker 1859 (saw sharks)
- Order Squatiniformes
  - Family Squatinidae Blainville 1816 (angel sharks)
- Order Torpediniformes
  - Family Platyrhinidae Jordan 1923 (thornbacks or fanrays)
  - Family Narkidae Fowler 1934 (sleeper rays)
  - Family Narcinidae Gill 1862 (electric rays)
  - Family Hypnidae Gill 1862 (coffin rays)
  - Family Torpedinidae Henle 1834 (torpedo electric rays or torpedo rays)
- Order Rhinopristiformes
  - Family Trygonorrhinidae Last, Séret & Naylor 2016 (fiddler rays or banjo rays)
  - Family Rhinobatidae Bonaparte 1835 (guitarfishes)
  - Family Rhinidae Müller & Henle 1841 (bowmouth guitarfishes or wedgefishes)
  - Family Glaucostegidae Last, Séret & Naylor 2016 (giant guitarfishes)
  - Family Pristidae Bonaparte 1835 (sawfishes)
- Order Rajiformes
  - Family Rajidae Blainville 1816 (hardnose skates)
  - Family Arhynchobatidae Fowler 1934 (softnose skates or longtail skates)
  - Family Gurgesiellidae de Buen 1959 (pygmy skates)
  - Family Anacanthobatidae von Bonde & Swart 1923 (legskates or smooth skates)
- Order Myliobatiformes
  - Family Zanobatidae Fowler 1934 (panrays)
  - Family Hexatrygonidae Heemstra & Smith 1980 (sixgill stingrays)
  - Family Dasyatidae Jordan & Gilbert 1879 (whiptail stingrays)
    - Subfamily Dasyatinae Jordan & Gilbert 1879 (stingrays)
    - Subfamily Neotrygoninae Last, Naylor & Manjaji-Matsumoto 2016 (shortsnout stingrays)
    - Subfamily Urogymninae Gray 1851 (whiprays)
    - Subfamily Hypolophinae Stromer 1910 (cowtail stingrays)
  - Family Potamotrygonidae Garman 1877 (neotropical stingrays)
    - Subfamily Styracurinae Carvalho, Loboda & da Silva 2016 (whiptail stingrays)
    - Subfamily Potamotrygoninae Garman 1877 (river stingrays)
  - Family Urotrygonidae McEachran, Dunn & Miyake 1996 (American round stingrays)
  - Family Gymnuridae Fowler 1934 (butterfly rays)
  - Family Plesiobatidae Nishida 1990 (deepwater stingrays or giant stingarees)
  - Family Urolophidae Müller & Henle 1841 (round stingrays or stingarees)
  - Family Aetobatidae Agassiz 1858 (pelagic eagle rays)
  - Family Myliobatidae Bonaparte 1835 (eagle rays)
  - Family Rhinopteridae Jordan & Evermann 1896 (cownose rays)
  - Family Mobulidae Gill 1893 (mantas or devil rays)

Class Holocephali
- Order Chimaeriformes
  - Family Callorhinchidae Garman 1901 (plownose chimaeras)
  - Family Chimaeridae Rafinesque 1815 (shortnose chimaeras or ratfishes)
  - Family Rhinochimaeridae Garman 1901 (longnose chimaeras)

Class Cladistii
- Order Polypteriformes
  - Family Polypteridae Bonaparte 1835 (bichirs)

Class Actinopteri
- Order Acipenseriformes
  - Family Acipenseridae Bonaparte 1831 (sturgeons)
  - Family Polyodontidae Bonaparte 1835 (paddlefishes)
- Order Amiiformes
  - Family Amiidae Bonaparte 1831 (bowfins)
- Order Lepisosteiformes
  - Family Lepisosteidae Agassiz 1832 (gars)
- Order Hiodontiformes
  - Family Hiodontidae Valenciennes 1847 (mooneyes)
- Order Osteoglossiformes
  - Family Pantodontidae Peters 1876 (freshwater butterfly fishes)
  - Family Osteoglossidae Bonaparte 1845 (bonytongues)
  - Family Arapaimidae Bonaparte 1846 (arapaimas)
  - Family Notopteridae Bleeker 1851 (featherfin knifefishes or featherbacks)
    - Subfamily Notopterinae Bleeker 1851 (Asiatic featherbacks)
    - Subfamily Xenomystinae Greenwood 1963 (African knifefishes)
  - Family Mormyridae Bonaparte 1831 (elephantfishes)
  - Family Gymnarchidae Bleeker 1859 (abas)
- Order Elopiformes
  - Family Elopidae Valenciennes 1847 (tenpounders and ladyfishes)
  - Family Megalopidae Jordan & Gilbert 1883 (tarpons)
- Order Albuliformes
  - Family Albulidae Bleeker 1849 (bonefishes)
    - Subfamily Albulinae Bleeker 1849 (bonefishes)
    - Subfamily Pterothrissinae Gill 1893 (longfin bonefishes or deepwater bonefishes)
- Order Notacanthiformes
  - Family Halosauridae Günther 1868 (halosaurs)
  - Family Notacanthidae Rafinesque 1810 (deepsea spiny eels)
- Order Anguilliformes
  - Family Chlopsidae Rafinesque 1815 (false morays)
- Suborder Synaphobranchoidei
  - Family Protanguillidae Johnson, Ida & Miya 2011 (primitive cave eels)
  - Family Synaphobranchidae Johnson 1862 (cutthroat eels)
    - Subfamily Simenchelyinae Gill 1879 (pugnose parasitic eels)
    - Subfamily Ilyophinae Jordan & Davis 1891 (arrowtooth eels or mustard eels)
    - Subfamily Synaphobranchinae Johnson 1862 (cutthroat eels)
- Suborder Anguilloidei
  - Family Moringuidae Gill 1885 (spaghetti eels)
  - Family Anguillidae Rafinesque 1810 (freshwater eels)
  - Family Nemichthyidae Kaup 1859 (snipe eels or threadtail snipe eels)
  - Family Serrivomeridae Trewavas 1932 (sawtooth eels)
  - Family Cyematidae Regan 1912 (bobtail eels)
  - Family Monognathidae Trewavas 1937 (onejaw gulpers)
  - Family Neocyematidae Poulsen, Miller, Sado, Hanel, Tsukamoto & Miya 2018 (orange bobtail eels)
  - Family Eurypharyngidae Gill 1883 (gulper eels or pelican eels)
  - Family Saccopharyngidae Bleeker 1859 (swallower eels or whiptail gulpers)
- Suborder Muraenoidei
  - Family Heterenchelyidae Regan 1912 (mud eels)
  - Family Myrocongridae Gill 1890 (myroconger eels)
  - Family Muraenidae Rafinesque 1815 (moray eels)
    - Subfamily Uropterygiinae Fowler 1925 (tailfin moray eels)
    - Subfamily Muraeninae Rafinesque 1815 (morays)
- Suborder Congroidei
  - Family Colocongridae Smith 1976 (shorttail eels)
  - Family Derichthyidae Gill 1884 (longneck eels or narrowneck eels)
  - Family Ophichthidae Günther 1870 (snake eels and worm eels)
    - Subfamily Myrophinae Kaup 1856 (worm eels)
    - Subfamily Ophichthinae Günther 1870 (snake eels)
  - Family Muraenesocidae Kaup 1859 (pike conger eels)
  - Family Nettastomatidae Kaup 1859 (duckbill eels)
  - Family Congridae Kaup 1856 (conger eels)
    - Subfamily Congrinae Kaup 1856 (congers)
    - Subfamily Bathymyrinae Böhlke 1949
    - Subfamily Heterocongrinae Günther 1870 (garden eels)

Order Clupeiformes
- Suborder Denticipitoidei
  - Family Denticipitidae Clausen 1959 (denticle herrings)
- Suborder Clupeoidei
  - Family Spratelloididae Jordan 1925 (dwarf herrings or small round herrings)
  - Family Engraulidae Gill 1861 (anchovies)
    - Subfamily Coiliinae Bleeker 1872 (Old World anchovies)
    - Subfamily Engraulinae Gill 1861 (anchovies)
  - Family Clupeidae Cuvier 1816 (herrings and sprats)
  - Family Chirocentridae Bleeker 1849 (wolf herrings)
  - Family Dussumieriidae Gill 1861 (round herrings or rainbow sardines)
  - Family Pristigasteridae Bleeker 1872 (longfin herrings)
  - Family Ehiravidae Deraniyagala 1929 (river sprats)
  - Family Alosidae Svetovidov 1952 (shads and sardines)
  - Family Dorosomatidae Gill 1861 (thread herrings or gizzard shads and sardinellas)

Order Alepocephaliformes
- Family Alepocephalidae Bonaparte 1846 (slickheads)
- Family Platytroctidae Koefoed 1927 (tubeshoulders)

Order Gonorynchiformes
- Family Chanidae Günther 1868 (milkfishes)
- Family Gonorynchidae Fowler 1941 (1848) (beaked sandfishes)
- Family Kneriidae Günther 1868 (shellears)
- Family Phractolaemidae Boulenger 1901 (snake mudheads)

Order Cypriniformes
- Suborder Gyrinocheiloidei
  - Family Gyrinocheilidae Gill 1907 (algae eaters)
- Suborder Catostomoidei
  - Family Catostomidae Agassiz 1850 (suckers)
    - Subfamily Myxocyprininae Fowler 1958 (Chinese suckers)
    - Subfamily Cycleptinae Gill 1861 (blue suckers)
    - Subfamily Ictiobinae Bleeker 1863 (carpsuckers and buffalos)
    - Subfamily Catostominae Agassiz 1850 (suckers)
- Suborder Cobitoidei
  - Family Botiidae Berg 1940 (pointface loaches)
    - Subfamily Leptobotiinae Nalbant 2002 (Chinese pointface loaches)
    - Subfamily Botiinae Berg 1940 (beautiful loaches)
  - Family Vaillantellidae Nalbant & Bănărescu 1977 (longfin loaches)
  - Family Cobitidae Swainson 1838 (spined loaches)
  - Family Barbuccidae Kottelat 2012 (scooter loaches)
  - Family Gastromyzontidae Fowler 1905 (hillstream loaches)
  - Family Serpenticobitidae Kottelat 2012 (snake loaches)
  - Family Balitoridae Swainson 1839 (river loaches)
  - Family Ellopostomatidae Bohlen & Šlechtová 2009 (square-head loaches)
  - Family Nemacheilidae Regan 1911 (brook loaches)
- Suborder Cyprinoidei
  - Family Paedocyprididae Mayden & Chen 2010 (tiny carps)
  - Family Psilorhynchidae Hora 1926 (mountain carps)
  - Family Cyprinidae Rafinesque 1815 (carps)
    - Subfamily Labeoninae Bleeker 1859 (labeonines)
    - Subfamily Probarbinae Yang et al. 2015 (primitive cyprinids)
    - Subfamily Torinae Karaman 1971 (large barbs)
    - Subfamily Smiliogastrinae Bleeker 1863 (small barbs)
    - Subfamily Cyprininae Rafinesque 1815 (carps)
    - Subfamily Acrossocheilinae Yang et al. 2015 (East Asian barbs)
    - Subfamily Barbinae Bleeker 1859 (barbels)
    - Subfamily Spinibarbinae Yang et al. 2015 (spine barbs)
    - Subfamily Schizothoracinae McClelland 1842 (snow barbels)
    - Subfamily Schizopygopsinae Mirza 1991 (mountain barbels)
  - Family Sundadanionidae Mayden & Chen 2010 (tiny danios)
  - Family Danionidae Bleeker 1863 (danionids)
    - Subfamily Chedrinae Bleeker 1863 (troutbarbs)
    - Subfamily Rasborinae Günther 1868 (rasborines)
    - Subfamily Danioninae Bleeker 1863 (danionines)
    - Subfamily Esominae Tan & Armbruster 2018 (flying barbs)
  - Family Leptobarbidae Bleeker 1864 (cigar barbs)
  - Family Xenocyprididae Günther 1868 (East Asian minnows or sharpbellies)
  - Family Tincidae Jordan 1878 (tenches)
  - Family Acheilognathidae Bleeker 1863 (bitterlings)
  - Family Gobionidae Bleeker 1863 (freshwater gudgeons)
  - Family Tanichthyidae Mayden & Chen 2010 (mountain minnows)
  - Family Leuciscidae Bonaparte 1835 (minnows)
    - Subfamily Pseudaspininae Bogutskaya 1990 (Far East Asian leuciscines)
    - Subfamily Laviniinae Bleeker 1863 (western chubs)
    - Subfamily Plagopterinae Cope 1874 (creek chubs)
    - Subfamily Leuciscinae Bonaparte 1835 (leuciscines)
    - Subfamily Phoxininae Bleeker 1863 (phoxinines)
    - Subfamily Pogonichthyinae Girard 1858 (minnows & shiners)

Order Gymnotiformes
- Family Apteronotidae Jordan 1923 (ghost knifefishes)
  - Subfamily Sternarchorhamphinae Albert 2001 (longsnout knifefishes)
  - Subfamily Apteronotinae Jordan 1923 (ghost knifefishes)
- Family Sternopygidae Cope 1871 (glass knifefishes)
  - Subfamily Sternopyginae Cope 1871 (rattail knifefishes)
  - Subfamily Eigenmanniinae Mago-Leccia 1978 (glass knifefishes)
- Family Gymnotidae Rafinesque 1815 (gymnotid eels)
  - Subfamily Electrophorinae Gill 1872 (electric eels)
  - Subfamily Gymnotinae Rafinesque 1815 (nakedback knifefishes)
- Family Hypopomidae Eigenmann 1912 (bluntnose knifefishes)
- Family Rhamphichthyidae Regan 1911 (painted knifefishes)

Order Characiformes
- Suborder Citharinoidei
  - Family Citharinidae Günther 1864 (citharinids)
  - Family Distichodontidae Günther 1864 (distichodontids)
- Suborder Characoidei
  - Family Crenuchidae Günther 1864 (crenuchids)
    - Subfamily Crenuchinae Günther 1864 (sailfin tetras)
    - Subfamily Characidiinae Fowler 1932 (South American darters)
  - Family Alestidae Cockerell 1910 (African tetras)
  - Family Lepidarchidae Melo & Stiassny 2024
  - Family Hepsetidae Hubbs 1939 (African pikes)
  - Family Tarumaniidae de Pinna, Zuanon, Rapp Py-Daniel & Petry 2017 (muckfishes)
  - Family Erythrinidae Valenciennes 1847 (trahiras)
  - Family Parodontidae Eigenmann 1910 (darter tetras)
  - Family Cynodontidae Eigenmann 1903 (sabertoothed characids)
  - Family Serrasalmidae Bleeker 1859 (piranhas and allies)
    - Subfamily Colossomatinae Kolmann et al. 2021 (lowland pacus)
    - Subfamily Myleinae Eigenmann 1903 (upland pacus)
    - Subfamily Serrasalminae Bleeker 1859 (piranhas)
  - Family Hemiodontidae Bleeker 1859 (hemiodontids)
  - Family Anostomidae Günther 1864 (toothed headstanders)
  - Family Chilodontidae Eigenmann 1903 (headstanders)
  - Family Curimatidae Gill 1858 (toothless characiforms)
  - Family Prochilodontidae Eigenmann 1909 (bocachicos)
  - Family Lebiasinidae Gill 1889 (lebiasinids)
    - Subfamily Lebiasininae Gill 1889 (lebiasinas)
    - Subfamily Pyrrhulininae Bleeker 1859 (splashing tetras and pencilfishes)
  - Family Ctenoluciidae Schultz 1944 (pike characids)
  - Family Chalceidae Fowler 1958 (tucanfishes)
  - Family Triportheidae Fowler 1940 (hatchet characins)
    - Subfamily Triportheinae Fowler 1940 (keeled characines)
    - Subfamily Agoniatinae Bleeker 1859 (anchovy characines)
    - Subfamily Clupeacharacinae Fowler 1958 (herring characines)
  - Family Gasteropelecidae Bleeker 1859 (freshwater hatchetfishes)
  - Family Bryconidae Eigenmann 1912 (bryconids)
    - Subfamily Bryconinae Eigenmann 1912 (bryconines)
    - Subfamily Salmininae Cockerell 1915 (dorados)
  - Family Iguanodectidae Eigenmann 1909 (iguanodectids)
  - Family Acestrorhynchidae Eigenmann 1912 (freshwater barracudas and biting tetras)
    - Subfamily Acestrorhynchinae Eigenmann 1912 (freshwater barracudas)
    - Subfamily Roestinae Lucena & Menezes 1998 (biting tetras)
    - Subfamily Heterocharacinae Géry 1966 (small biting tetras)
  - Family Spintherobolidae Mirande 2019 (piquiras)
  - Family Stevardiidae Gill 1858 (stevardiids)
    - Subfamily Landoninae Weitzman & Menezes 1998 (caudal sac characins)
    - Subfamily Xenurobryconinae Myers & Böhlke 1956 (xenurobryconines)
    - Subfamily Glandulocaudinae Eigenmann 1914 (chirping tetras)
    - Subfamily Argopleurinae Melo & Oliveira 2024 (Andean tetras)
    - Subfamily Hemibryconinae Géry 1966 (hemibryconines)
    - Subfamily Stevardiinae Gill 1858 (stevardiines)
    - Subfamily Planaltininae Oliveira & Souza 2024 (Brazilian Shield tetras)
    - Subfamily Creagrutinae Miles 1943 (creagrutines)
    - Subfamily Diapominae Eigenmann 1909
  - Family Characidae Latreille 1825 (characids)
    - Subfamily Aphyocharacinae Eigenmann 1909 (glass characins)
    - Subfamily Cheirodontinae Eigenmann 1915 (cheirodontines)
    - Subfamily Exodontinae Fowler 1958 (lepidophagous characins)
    - Subfamily Tetragonopterinae Gill 1858
    - Subfamily Characinae Latreille 1825 (characines)
  - Family Acestrorhamphidae Eigenmann 1907 (American tetras)
    - Subfamily Oxybryconinae Melo, Mattox & Oliveira 2024
    - Subfamily Trochilocharacinae Zarske 2010 (hummingbird characins)
    - Subfamily Stygichthyinae Géry 1972
    - Subfamily Megalamphodinae Carvalho, Lima & Melo 2024 (red tetras)
    - Subfamily Stichonodontinae Eigenmann 1910
    - Subfamily Stethaprioninae Eigenmann 1907 (discus tetras)
    - Subfamily Pristellinae Géry & Boutière 1964
    - Subfamily Jupiabinae Benine & Ota 2024
    - Subfamily Tyttobryconinae Mattox & Melo 2024
    - Subfamily Hyphessobryconinae Lima, Carvalho & Faria 2024 (multicusp characins)
    - Subfamily Thayeriinae Ota, Reia & Benine 2024
    - Subfamily Rhoadsiinae Fowler 1911 (Pacific characins)
    - Subfamily Grundulinae Fowler 1958
    - Subfamily Acestrorhamphinae Eigenmann 1907
  - Family Characids incertae sedis

Order Siluriformes
- Suborder Diplomystoidei
  - Family Diplomystidae Eigenmann 1890 (diplomystid catfishes)
- Suborder Cetopsoidei
  - Family Cetopsidae Bleeker 1858 (cetopsid catfishes)
    - Subfamily Cetopsinae Bleeker 1858 (whalelike catfishes)
    - Subfamily Helogeninae Regan 1911 (marbled catfishes)
- Suborder Loricarioidei
  - Family Nematogenyidae Bleeker 1862 (mountain catfishes)
  - Family Trichomycteridae Bleeker 1858 (pencil catfishes)
    - Subfamily Copionodontinae de Pinna 1992 (Chapada pencil catfishes)
    - Subfamily Trichogeninae Isbrücker 1986 (longfin pencil catfishes)
    - Subfamily Trichomycterinae Bleeker 1858 (pencil catfishes)
    - Subfamily Microcambevinae Costa, Henschel & Katz 2020 (Atlantic Forest trichomycterids)
    - Subfamily Glanapteryginae Myers 1944 (miniature pencil catfishes)
    - Subfamily Sarcoglanidinae Myers & Weitzman 1966 (psammophilic catfishes)
    - Subfamily Tridentinae Eigenmann 1918 (tiny pencil catfishes)
    - Subfamily Stegophilinae Günther 1864 (parasitic catfishes)
    - Subfamily Vandelliinae Bleeker 1862 (hematophagous catfishes)
  - Family Callichthyidae Bonaparte 1835 (callichthyid armored catfishes)
    - Subfamily Callichthyinae Bonaparte 1835 (callichthyines)
    - Subfamily Corydoradinae Hoedeman 1952 (corys)
  - Family Loricariidae Rafinesque 1815 (suckermouth armored catfishes)
    - Subfamily Lithogeninae Gosline 1947 (climbing armored catfishes)
    - Subfamily Delturinae Reis, Pereira & Armbruster 2006 (primitive suckermouth catfishes)
    - Subfamily Rhinelepinae Armbruster 2004 (rhinelepine plecos)
    - Subfamily Loricariinae Rafinesque 1815 (mailed catfishes)
    - Subfamily Hypoptopomatinae Eigenmann & Eigenmann 1890 (cascudinhos)
    - Subfamily Hypostominae Kner 1853 (suckermouth catfishes)
  - Family Scoloplacidae Bailey & Baskin 1976 (spiny dwarf catfishes)
  - Family Astroblepidae Bleeker 1862 (climbing catfishes)
- Suborder Siluroidei
  - Family Chacidae Bleeker 1858 (squarehead or angler catfishes)
  - Family Plotosidae Bleeker 1858 (eeltail catfishes)
  - Family Ritidae Bleeker 1862 (velvet catfishes)
  - Family Ailiidae Bleeker 1858 (Asian schilbeids)
  - Family Horabagridae Jayaram 2006 (imperial catfishes)
  - Family Bagridae Bleeker 1858 (bagrid catfishes)
  - Family Akysidae Gill 1861 (stream catfishes)
    - Subfamily Akysinae Gill 1861 (wasp catfishes)
    - Subfamily Parakysinae Roberts 1989 (warty catfishes)
  - Family Amblycipitidae Day 1873 (torrent catfishes)
  - Family Sisoridae Bleeker 1858 (sisorid catfishes)
    - Subfamily Sisorinae Bleeker 1858 (Asian stream catfishes)
    - Subfamily Glyptosterninae Gill 1861 (Asian sucker catfishes)
  - Family Pangasiidae Bleeker 1858 (pangasid catfishes)
  - Family Siluridae Rafinesque 1815 (sheatfishes)
  - Family Kryptoglanidae Britz, Kakkassery & Raghavan 2014 (Indian cave catfishes)
  - Family Aspredinidae Adams 1854 (banjo catfishes)
    - Subfamily Pseudobunocephalinae Carvalho, Arce H., Reis & Sabaj 2018 (terminal-mouth banjo catfishes)
    - Subfamily Hoplomyzontinae Fernández-Yépez 1950 (small banjo catfishes)
    - Subfamily Aspredininae Adams 1854 (banjo cats)
  - Family Auchenipteridae Bleeker 1862 (intromittant catfishes)
    - Subfamily Centromochlinae Bleeker 1862 (dimorphic intromittant catfishes)
    - Subfamily Auchenipterinae Bleeker 1862 (driftwood catfishes)
  - Family Doradidae Bleeker 1858 (thorny catfishes)
    - Subfamily Acanthodoradinae Sabaj & Mariangeles 2021
    - Subfamily Astrodoradinae Higuchi, Birindelli, Sousa & Britski 2007 (spotted thorny cats)
    - Subfamily Wertheimerinae Birindelli 2014 (Eastern Brazil thorny cats)
    - Subfamily Agamyxinae Sabaj & Mariangeles 2021
    - Subfamily Rhinodoradinae Sabaj & Mariangeles 2021
    - Subfamily Doradinae Bleeker 1858 (fimbriate-barbel thorny cats)
  - Family Heptapteridae Gill 1861 (seven-finned catfishes)
    - Subfamily Rhamdiinae Bleeker 1862 (whiskered catfishes)
    - Subfamily Heptapterinae Gill 1861 (slender whiskered catfishes)
  - Family Phreatobiidae Reichel 1927 (cistern catfishes)
  - Family Pimelodidae Bonaparte 1835 (long-whiskered catfishes)
  - Family Pseudopimelodidae Fernández-Yépez & Antón 1966 (bumblebee catfishes)
    - Subfamily Pseudopimelodinae Fernández-Yépez & Antón 1966
    - Subfamily Batrochoglaninae Shibatta & Silva 2021 (frog catfishes)
  - Family Clariidae Bonaparte 1845 (airbreathing or labyrinth catfishes)
  - Family Heteropneustidae Hora 1936 (airsac catfishes)
  - Family Ariidae Bleeker 1858 (sea catfishes)
    - Subfamily Galeichthyinae Acero & Betancur-R. 2007 (bearded sea catfishes)
    - Subfamily Ariinae Bleeker 1858
    - Subfamily Bagreinae Schultz 1944 (whiskered sea catfishes)
  - Family Anchariidae Glaw & Vences 1994 (Malagasy catfishes)
  - Family Austroglanididae Mo 1991 (rock catlets)
  - Family Cranoglanididae Myers 1931 (armorhead catfishes)
  - Family Ictaluridae Gill 1861 (North American freshwater catfishes)
  - Family Lacantuniidae Rodiles-Hernández, Hendrickson & Lundberg 2005 (Lacantún catfishes or Chiapas catfishes)
  - Family Amphiliidae Regan 1911 (loach catfishes)
    - Subfamily Amphiliinae Regan 1911 (amphiliine catfishes)
    - Subfamily Leptoglaninae Roberts 2003 (sand catlets)
    - Subfamily Doumeinae Regan 1911 (doumeine catfishes)
  - Family Malapteruridae Bleeker 1858 (electric catfishes)
  - Family Mochokidae Regan 1912 (squeakers and upside-down catfishes)
    - Subfamily Chiloglanidinae Vigliotta 2008 (African suckermouths)
    - Subfamily Mochokinae Regan 1912 (squeakers)
  - Family Auchenoglanididae Jayaram 1966 (flatnose catfishes)
  - Family Claroteidae Bleeker 1862 (grunter catfishes)
  - Family Schilbeidae Bleeker 1858 (schilbeid catfishes)

Order Lepidogalaxiiformes
- Family Lepidogalaxiidae Rosen 1974 (salamanderfishes)

Order Argentiniformes
- Family Argentinidae Bonaparte 1846 (argentines)
- Family Opisthoproctidae Schmidt 1918 (spookfishes or barreleyes)
- Family Microstomatidae Bleeker 1859 (pencilsmelts)
- Family Bathylagidae Gill 1884 (deepsea smelts)

Order Salmoniformes
- Suborder Salmonoidei
  - Family Salmonidae Cuvier 1816 (salmonids)
    - Subfamily Coregoninae Bonaparte 1845 (whitefishes)
    - Subfamily Thymallinae Gill 1885 (graylings)
    - Subfamily Salmoninae Cuvier 1816 (salmons, trouts, chars and allies)
- Suborder Esocoidei
  - Family Esocidae Rafinesque 1815 (pikes)
    - Subfamily Dalliinae Jordan 1885 (blackfishes)
    - Subfamily Esocinae Rafinesque 1815 (pikes)
  - Family Umbridae Bonaparte 1845 (mudminnows)

Order Galaxiiformes
- Family Galaxiidae Müller 1845 (galaxiids)
  - Subfamily Aplochitoninae Günther 1864 (peladillas)
  - Subfamily Galaxiinae Müller 1845 (white bait and mudfishes)

Order Osmeriformes
- Suborder Retropinnoidei
  - Family Retropinnidae Gill 1862 (New Zealand smelts)
    - Subfamily Retropinninae Gill 1862 (southern smelts)
    - Subfamily Prototroctinae Hubbs 1952 (southern graylings)
- Suborder Osmeroidei
  - Family Osmeridae Regan 1913 (smelts)
  - Family Plecoglossidae Bleeker 1859 (ayu fishes)
  - Family Salangidae Bleeker 1859 (icefishes or noodlefishes)

Order Stomiiformes
- Family Gonostomatidae Cocco 1838 (bristlemouths)
- Family Sternoptychidae Duméril 1805 (marine hatchetfishes)
  - Subfamily Maurolicinae Gill 1885
  - Subfamily Sternoptychinae Duméril 1805 (marine hatchetfishes)
- Family Phosichthyidae Weitzman 1974 (lightfishes)
- Family Stomiidae Bleeker 1859 (dragonfishes or barbeled dragonfishes)
  - Subfamily Chauliodontinae Bonaparte 1845 (viperfishes)
  - Subfamily Stomiinae Bleeker 1859 (scaly dragonfishes)
  - Subfamily Astronesthinae Günther 1864 (snaggletooths)
  - Subfamily Melanostomiinae Parr 1927 (scaleless black dragonfishes)
  - Subfamily Malacosteinae Gill 1890 (loosejaws)
  - Subfamily Idiacanthinae Gill 1893 (black dragonfishes)

Order Ateleopodiformes
- Family Ateleopodidae Bonaparte 1850 (jellynose fishes)

Order Aulopiformes
- Family Aulopidae Bonaparte 1831 (flagfins)
- Family Chlorophthalmidae Garman 1899 (greeneyes)
- Family Paraulopidae Sato & Nakabo 2002 (cucumber fishes)
- Family Ipnopidae Gill 1884 (deepsea tripodfishes)
- Family Bathysauroididae Sato & Nakabo 2002 (largescale deepsea lizardfishes)
- Family Scopelarchidae Alcock 1896 (pearleyes)
- Family Notosudidae Parr 1928 (paperbones or waryfishes)
- Family Giganturidae Brauer 1906 (telescopefishes)
- Family Synodontidae Gill 1861 (lizardfishes)
  - Subfamily Synodontinae Gill 1861 (lizardfishes)
  - Subfamily Harpadontinae Bleeker 1875 (Bombay ducks)
- Family Bathysauridae Fowler 1944 (deepsea lizardfishes)
- Family Paralepididae Bonaparte 1835 (barracudinas)
- Family Anotopteridae Zugmayer 1911 (daggertooths)
- Family Evermannellidae Fowler 1901 (sabertooth fishes)
- Family Omosudidae Regan 1911 (hammerjaws)
- Family Alepisauridae Swainson 1839 (lancetfishes)
- Family Pseudotrichonotidae Yoshino & Araga 1975 (sand-diving lizardfishes)

Order Myctophiformes
- Family Neoscopelidae Jordan 1901 (blackchins)
- Family Myctophidae Gill 1893 (lanternfishes)
  - Subfamily Gymnoscopelinae Paxton 1972 (luminous lanternfishes)
  - Subfamily Notolychninae Paxton 1972 (topside lanternfishes)
  - Subfamily Lampanyctinae Paxton 1972 (toothy lampfishes)
  - Subfamily Diaphinae Paxton 1972 (headlightfishes)
  - Subfamily Myctophinae Gill 1893 (lanternfishes)

Order Lampriformes
- Family Lampridae Gill 1862 (opahs)
- Family Veliferidae Bleeker 1859 (velifers)
- Family Lophotidae Bonaparte 1845 (crestfishes)
- Family Radiicephalidae Osório 1917 (tapertails)
- Family Trachipteridae Swainson 1839 (ribbonfishes or dealfishes)
- Family Regalecidae Gill 1884 (oarfishes)

Order Polymixiiformes
- Family Polymixiidae Bleeker 1859 (beardfishes)

Order Percopsiformes
- Family Percopsidae Agassiz 1850 (trout-perches)
- Family Aphredoderidae Bonaparte 1845 (pirate perches)
- Family Amblyopsidae Bonaparte 1845 (cavefishes)

Order Zeiformes
- Family Zeidae Rafinesque 1815 (dories)
- Family Cyttidae Günther 1860 (lookdown dories)
- Family Oreosomatidae Bleeker 1859 (oreos)
  - Subfamily Pseudocyttinae Tyler, O'Toole & Winterbottom 2003
  - Subfamily Oreosomatinae Bleeker 1859
- Family Parazenidae McAllister 1968 (smooth dories)
  - Subfamily Parazeninae McAllister 1968
  - Subfamily Cyttopsinae no valid family-group name description
- Family Zeniontidae Myers 1960 (dwarf dories or armoreye dories)
- Family Grammicolepididae Poey 1873 (tinselfishes)
  - Subfamily Macrurocyttinae Myers 1960
  - Subfamily Grammicolepidinae Poey 1873

Order Gadiformes
- Suborder Stylephoroidei
  - Family Stylephoridae Swainson 1839 (tube-eyes or threadtails)
- Suborder Bregmacerotoidei
  - Family Bregmacerotidae Gill 1872 (codlets)
- Suborder Gadoidei
  - Family Phycidae Swainson 1838 (phycid hakes)
  - Family Gaidropsaridae Jordan & Evermann 1898 (rocklings)
  - Family Lotidae Bonaparte 1835 (hakes and burbots)
  - Family Gadidae Rafinesque 1810 (cods and haddocks)
- Suborder Ranicipitoidei
  - Family Ranicipitidae Bonaparte 1835 (tadpole fishes)
- Suborder Merluccioidei
  - Family Merlucciidae Rafinesque 1815 (merlucciid hakes)
- Suborder Macrouroidei
  - Family Euclichthyidae Cohen 1984 (Eucla cods)
  - Family Muraenolepididae Regan 1903 (eel cods)
  - Family Melanonidae Goode & Bean 1896 (arrowtails or pelagic cods)
  - Family Trachyrincidae Goode & Bean 1896 (armoured grenadiers)
  - Family Moridae Moreau 1881 (codlings or deepsea cods)
  - Family Macruronidae Regan 1903 (blue grenadiers)
  - Family Lyconidae Günther 1887 (Atlantic hakes)
  - Family Bathygadidae Jordan & Evermann 1898 (rattails)
  - Family Steindachneriidae Parr 1942 (luminous hakes)
  - Family Macrouridae Bonaparte 1831 (grenadiers or rattails)

Order Trachichthyiformes
- Family Diretmidae Gill 1893 (spinyfins)
- Family Monocentridae Gill 1859 (pinecone fishes)
- Family Anomalopidae Gill 1889 (flashlightfishes or lanterneye fishes)
- Family Trachichthyidae Bleeker 1856 (roughies or slimeheads)
- Family Anoplogastridae Gill 1893 (fangtooths)

Order Beryciformes
- Suborder Holocentroidei
  - Family Holocentridae Bonaparte 1833 (squirrelfishes and soldierfishes)
    - Subfamily Holocentrinae Bonaparte 1833 (squirrelfishes)
    - Subfamily Myripristinae Nelson 1955 (soldierfishes)
- Suborder Berycoidei
  - Family Berycidae Lowe 1839 (berycids or alfonsinos)
  - Family Melamphaidae Gill 1893 (bigscales)
- Suborder Stephanoberycoidei
  - Family Stephanoberycidae Gill 1884 (pricklefishes)
  - Family Hispidoberycidae Kotlyar 1981 (spiny-scale pricklefishes)
  - Family Gibberichthyidae Parr 1933 (gibberfishes)
  - Family Rondeletiidae Goode & Bean 1895 (redmouth whalefishes)
  - Family Barbourisiidae Parr 1945 (redvelvet whalefishes)
  - Family Cetomimidae Goode & Bean 1895 (whalefishes or flabby whalefishes)

Order Ophidiiformes
- Family Acanthonidae Wong & Chen 2024 (deepsea cusk-eels)
- Family Brotulidae Swainson 1838 (bearded cusk-eels)
- Family Ophidiidae Rafinesque 1810 (cusk-eels)
  - Subfamily Brotulotaeniinae Cohen & Nielsen 1978 (prickle cusk-eels)
  - Subfamily Ophidiinae Rafinesque 1810 (true cusk-eels)
  - Subfamily Neobythitinae Radcliffe 1913
- Family Carapidae Poey 1867 (pearlfishes)
  - Subfamily Carapinae Poey 1867 (fierasfers)
  - Subfamily Pyramodontinae Smith 1955 (pyramodontines)
  - Subfamily Tetragondacninae Anderson & Satria 2007 (square-mouthed pearlfishes)
  - Subfamily Hypopleuroninae Prokofiev 2004 (whiptail pearlfishes)
- Family Bythitidae Gill 1861 (viviparous brotulas)
- Family Dinematichthyidae Whitley 1928 (dwarf brotulas)

Order Batrachoidiformes
- Family Batrachoididae Jordan 1896 (toadfishes)
  - Subfamily Porichthyinae Miranda Ribeiro 1915
  - Subfamily Thalassophryninae Miranda Ribeiro 1915 (venomous toadfishes)
  - Subfamily Batrachoidinae Jordan 1896
  - Subfamily Halophryninae Greenfield, Winterbottom & Collette 2008 (Old World threespine toadfishes)

Order Gobiiformes
- Suborder Apogonoidei
  - Family Kurtidae Bleeker 1859 (nurseryfishes)
  - Family Apogonidae Günther 1859 (cardinalfishes)
    - Subfamily Apogoninae Günther 1859
    - Subfamily Pseudamiinae Smith 1954
    - Subfamily Amioidinae Fraser & Mabuchi 2014
    - Subfamily Paxtoninae Fraser & Mabuchi 2014
- Suborder Trichonotoidei
  - Family Trichonotidae Günther 1861 (sand divers)
- Suborder Gobioidei
  - Family Rhyacichthyidae Jordan 1905 (loach gobies)
  - Family Odontobutidae Hoese & Gill 1993 (Asian freshwater sleepers)
  - Family Eleotridae Bonaparte 1835 (sleepers)
    - Subfamily Butinae Bleeker 1874 (gudgeons)
    - Subfamily Eleotrinae Bonaparte 1835 (spinycheek sleepers or bullies)
    - Subfamily Milyeringinae Whitley 1945 (cave gudgeons)
  - Family Xenisthmidae Miller 1973 (collared wrigglers)
  - Family Oxudercidae Günther 1861 (mudskippers and allies)
    - Subfamily Oxudercinae Günther 1861 (mudskippers)
    - Subfamily Amblyopinae Günther 1861 (mudburrowing gobies)
    - Subfamily Gobionellinae Bleeker 1874 (estuarine gobies)
    - Subfamily Sicydiinae Gill 1860 (rock-climbing gobies)
  - Family Gobiidae Cuvier 1816 (gobies)
    - Subfamily Kraemeriinae Whitley 1935 (1911) (sand darts)
    - Subfamily Ptereleotrinae Bleeker 1875 (dart-gobies)
    - Subfamily Gobiinae Cuvier 1816 (sea gobies)
    - Subfamily Microdesminae Regan 1912 (wormfishes)
  - Family Thalasseleotrididae Gill & Mooi 2012 (ocean sleepers)

Order Syngnathiformes
- Suborder Dactylopteroidei
  - Family Pegasidae Bonaparte 1831 (seamoths)
  - Family Dactylopteridae Gill 1861 (helmet gurnards or flying gurnards)
- Suborder Mulloidei
  - Family Mullidae Rafinesque 1815 (goatfishes)
- Suborder Callionymoidei
  - Family Callionymidae Bonaparte 1831 (dragonets)
  - Family Draconettidae Jordan & Fowler 1903 (slope dragonets)
- Suborder Syngnathoidei
  - Family Aulostomidae Rafinesque 1815 (trumpetfishes)
  - Family Fistulariidae Stark 1828 (cornetfishes)
  - Family Centriscidae Bonaparte 1831 (snipefishes or shrimpfishes)
    - Subfamily Macroramphosinae Bleeker 1879 (snipefishes)
    - Subfamily Centriscinae Bonaparte 1831 (shrimpfishes)
  - Family Solenostomidae Nardo 1843 (ghost pipefishes)
  - Family Syngnathidae Bonaparte 1831 (pipefishes and seahorses)
    - Subfamily Nerophinae Kaup 1853 (trunk-brooding pipefishes)
    - Subfamily Syngnathinae Bonaparte 1831 (tail-brooding pipefishes)

Order Scombriformes
- Suborder Stromateoidei
  - Family Amarsipidae Haedrich 1969 (bagless glassfishes or amarsipas)
  - Family Centrolophidae Bonaparte 1846 (medusafishes)
  - Family Nomeidae Günther 1860 (driftfishes)
  - Family Tetragonuridae Risso 1827 (squaretails)
  - Family Ariommatidae Haedrich 1967 (ariommas or ariommatids)
  - Family Stromateidae Rafinesque 1810 (butterfishes)
- Suborder Scombroidei
  - Family Pomatomidae Gill 1863 (bluefishes)
  - Family Icosteidae Jordan & Gilbert 1880 (ragfishes)
  - Family Arripidae Gill 1893 (Australian salmons)
  - Family Chiasmodontidae Jordan & Gilbert 1883 (swallowers)
  - Family Scombridae Rafinesque 1815 (mackerels, tunas and bonitos)
    - Subfamily Gasterochismatinae Poey 1869 (kingfishes)
    - Subfamily Scombrinae Rafinesque 1815 (mackerels)
  - Family Caristiidae Gill & Smith 1905 (manefishes)
  - Family Bramidae Bonaparte 1831 (pomfrets)
  - Family Scombrolabracidae Fowler 1925 (longfin escolars or black mackerels)
  - Family Gempylidae Gill 1862 (snake mackerels)
  - Family Trichiuridae Rafinesque 1810 (cutlassfishes)
    - Subfamily Aphanopodinae Gill 1863 (frostfishes)
    - Subfamily Lepidopodinae Gill 1863 (scabbardfishes)
    - Subfamily Trichiurinae Rafinesque 1810 (hairtails)

Order Synbranchiformes
- Suborder Mastacembeloidei
  - Family Mastacembelidae Swainson 1839 (freshwater spiny-eels)
  - Family Chaudhuriidae Annandale 1918 (earthworm eels)
- Suborder Indostomoidei
  - Family Indostomidae Prashad & Mukerji 1929 (armored sticklebacks)
- Suborder Synbranchoidei
  - Family Synbranchidae Bonaparte 1835 (swamp eels)

Order Anabantiformes
- Suborder Anabantoidei
  - Family Anabantidae Bonaparte 1831 (climbing gouramies)
  - Family Helostomatidae Gill 1872 (kissing gouramies)
  - Family Osphronemidae van der Hoeven 1832 (gouramies)
    - Subfamily Belontiinae Liem 1962 (combtail gouramies)
    - Subfamily Osphroneminae van der Hoeven 1832 (giant gouramies)
    - Subfamily Luciocephalinae Bleeker 1852 (spiral egg gouramies)
    - Subfamily Trichogastrinae Bleeker 1879 (threadfishes)
    - Subfamily Macropodusinae Hoedeman 1948 (paradise fishes and fighting fishes)
- Suborder Channoidei
  - Family Aenigmachannidae Britz, Dahanukar, Anoop, Philip, Clark, Raghavan & Rüber 2020 (Gollum snakehead fishes)
  - Family Channidae Fowler 1934 (1831) (snakeheads)
- Suborder Nandoidei
  - Family Nandidae Bleeker 1852 (Asian leaffishes)
  - Family Badidae Barlow, Liem & Wickler 1968 (chameleon fishes)
  - Family Pristolepididae Regan 1913 (mudperches)

Order Carangiformes
- Suborder Centropomoidei
  - Family Latidae Jordan 1888 (giant perches)
  - Family Centropomidae Poey 1967 (snooks)
  - Family Lactariidae Boulenger 1904 (false trevallies)
  - Family Sphyraenidae Rafinesque 1815 (barracudas)
- Suborder Pleuronectoidei
  - Family Polynemidae Rafinesque 1815 (threadfins or tassel-fishes)
  - Family Psettodidae Regan 1910 (spiny turbots)
  - Family Citharidae de Buen 1935 (largescale flounders)
  - Family Scophthalmidae Chabanaud 1933 (turbots)
  - Family Cyclopsettidae Campbell et al. 2019 (sand whiffs or large-tooth flounders)
  - Family Bothidae Smitt 1892 (lefteye flounders)
  - Family Paralichthyidae Regan 1910 (sand flounders)
  - Family Pleuronectidae Rafinesque 1815 (righteye flounders)
    - Subfamily Atheresthinae Vinnikov, Thomson & Munroe 2018
    - Subfamily Pleuronichthyinae Vinnikov, Thomson & Munroe 2018
    - Subfamily Microstominae Cooper & Chapleau 1998 (smallmouth flounders)
    - Subfamily Hippoglossinae Gill 1864 (halibuts)
    - Subfamily Pleuronectinae Rafinesque 1815 (true flounders)
  - Family Paralichthodidae Regan 1920 (peppered flounders)
  - Family Oncopteridae Jordan & Goss 1889 (remo flounders)
  - Family Rhombosoleidae Regan 1910 (South Pacific flounders)
  - Family Achiropsettidae Heemstra 1990 (southern flounders or armless flounders)
  - Family Achiridae Rafinesque 1815 (American soles)
  - Family Samaridae Jordan & Goss 1889 (crested flounders)
  - Family Poecilopsettidae Norman 1934 (bigeye flounders)
  - Family Soleidae Bonaparte 1833 (soles)
  - Family Cynoglossidae Jordan 1888 (tonguefishes)
    - Subfamily Symphurinae Ochiai 1963 (straightsnout tongue soles)
    - Subfamily Cynoglossinae Jordan 1888 (hookedsnout tongue soles)
- Suborder Toxotoidei
  - Family Leptobramidae Ogilby 1913 (beachsalmons)
  - Family Toxotidae Bleeker 1859 (archerfishes)
- Suborder Nematistioidei
  - Family Nematistiidae Gill 1862 (roosterfishes)
- Suborder Menoidei
  - Family Menidae Fitzinger 1873 (moonfishes)
  - Family Xiphiidae Rafinesque 1815 (swordfishes)
  - Family Istiophoridae Rafinesque 1815 (billfishes and marlins)
- Suborder Carangoidei
  - Family Carangidae Rafinesque 1815 (jacks or jack mackerels)
    - Subfamily Naucratinae Bleeker 1859 (amberjacks)
    - Subfamily Caranginae Rafinesque 1815 (trevallies and kingfishes)
    - Subfamily Scomberoidinae Jordan & Gilbert 1883 (leatherjackets and queenfishes)
    - Subfamily Trachinotinae Gill 1861 (pompanos)
  - Family Echeneidae Rafinesque 1810 (remoras and sharksuckers)
  - Family Rachycentridae Gill 1896 (cobias)
  - Family Coryphaenidae Rafinesque 1815 (dolphinfishes)

Order Atheriniformes
- Family Atherinidae Risso 1827 (Old World silversides)
  - Subfamily Atherinomorinae Dyer & Chernoff 1996 (tropical silversides)
  - Subfamily Atherininae Risso 1827 (silversides)
  - Subfamily Craterocephalinae Dyer & Chernoff 1996 (hardyheads)
  - Subfamily Bleheratherininae Aarn & Ivantsoff 2009 (New Caledonian silversides)
- Family Bedotiidae Jordan & Hubbs 1919 (Malagasy rainbowfishes)
- Family Melanotaeniidae Gill 1894 (rainbowfishes)
- Family Pseudomugilidae Kner 1867 (blue eyes)
- Family Telmatherinidae Munro 1958 (sailfin silversides)
- Family Notocheiridae Schultz 1950 (surf silversides)
- Family Isonidae Rosen 1964 (surf sardines)
- Family Atherionidae Schultz 1948 (pricklenose silversides)
- Family Dentatherinidae Patten & Ivantsoff 1983 (tusked silversides)
- Family Phallostethidae Regan 1916 (priapum fishes)
- Family Atherinopsidae Fitzinger 1873 (New World silversides)
  - Subfamily Atherinopsinae Fitzinger 1873 (neotropical silversides)
  - Subfamily Menidiinae Schultz 1948 (Gulf of Mexico silversides)

Order Beloniformes
- Family Scomberesocidae Bleeker 1858 (sauries)
- Family Belonidae Bonaparte 1835 (needlefishes)
- Family Hemiramphidae Gill 1859 (halfbeaks)
- Family Zenarchopteridae Fowler 1934 (internally fertilized halfbeaks)
- Family Exocoetidae Risso 1827 (flyingfishes)
- Family Adrianichthyidae Weber 1913 (adrianichthyids)
  - Subfamily Oryziinae Myers 1938 (medakas or ricefishes)
  - Subfamily Adrianichthyinae Weber 1913 (adrianichthyines)

Order Cyprinodontiformes
- Suborder Aplocheiloidei
  - Family Aplocheilidae Bleeker 1859 (Old World rivulins)
  - Family Nothobranchiidae Garman 1895 (African rivulins)
  - Family Rivulidae Myers 1925 (New World rivulins)
    - Subfamily Rivulinae Myers 1925 (rivulines)
    - Subfamily Kryptolebiatinae Costa 2004 (mangrove killifishes)
    - Subfamily Cynolebiinae Hoedeman 1961 (pearl killifishes)
- Suborder Cyprinodontoidei
  - Family Pantanodontidae Myers 1955 (spine killifishes)
  - Family Fundulidae Günther 1866 (topminnows and killifishes)
  - Family Cyprinodontidae Wagner 1828 (killifishes)
    - Subfamily Cubanichthyinae Parenti 1981 (island pupfishes)
    - Subfamily Cyprinodontinae Wagner 1828 (pupfishes)
    - Subfamily Orestiinae Bleeker 1859 (Andean killifishes)
  - Family Profundulidae Hoedeman & Bronner 1951 (Middle American killifishes)
  - Family Goodeidae Jordan & Gilbert 1883 (splitfins)
    - Subfamily Empetrichthyinae Jordan, Evermann & Clark 1930 (springfishes)
    - Subfamily Goodeinae Jordan & Gilbert 1883 (Mexican splitfins)
  - Family Fluviphylacidae Roberts 1970 (American lampeyes)
  - Family Poeciliidae Bonaparte 1831 (poeciliids)
    - Subfamily Xenodexiinae Hubbs 1950 (Guatemalan poeciliids)
    - Subfamily Tomeurinae Eigenmann 1912 (facultative viviparous poeciliids)
    - Subfamily Poeciliinae Bonaparte 1831 (livebearers)
  - Family Anablepidae Bonaparte 1831 (four-eyed fishes and onesided livebearers)
    - Subfamily Anablepinae Bonaparte 1831 (four-eyed fishes)
    - Subfamily Oxyzygonectinae Parenti 1981 (white-eyes)
  - Family Aphaniidae Hoedeman 1949 (Oriental killifishes)
  - Family Valenciidae Parenti 1981 (European killifishes)
  - Family Procatopodidae Fowler 1916 (African lampeyes)
    - Subfamily Aplocheilichthyinae Myers 1928 (banded lampeyes)
    - Subfamily Procatopodinae Fowler 1916 (lampeyes)

Order Cichliformes
- Family Polycentridae Gill 1858 (leaffishes)
- Family Cichlidae Bonaparte 1835 (cichlids)
  - Subfamily Etroplinae Kullander 1998 (Indian and Madagascan cichlids)
  - Subfamily Ptychochrominae Sparks 2004 (Malagasy cichlids)
  - Subfamily Pseudocrenilabrinae Fowler 1934 (African cichlids)
  - Subfamily Cichlinae Bonaparte 1835 (American cichlids)
- Family Pholidichthyidae Jordan 1896 (convict-blennies)

Order Mugiliformes
- Family Ambassidae Klunzinger 1870 (Asiatic glassfishes)
- Family Mugilidae Jarocki 1822 (mullets)

Order Blenniiformes
- Family Pseudochromidae Müller & Troschel 1849 (dottybacks)
  - Subfamily Pseudochrominae Müller & Troschel 1849
  - Subfamily Pseudoplesiopinae Bleeker 1875
  - Subfamily Anisochrominae Smith 1954
  - Subfamily Congrogadinae Günther 1862 (eelblennies)
  - Subfamily Assiculinae Gill 2013
  - Subfamily Assiculoidinae Gill 2013
- Family Plesiopidae Günther 1861 (roundheads)
  - Subfamily Plesiopinae Günther 1861
  - Subfamily Acanthoclininae Günther 1861 (spiny basslets)
- Family Pomacentridae Bonaparte 1831 (damselfishes and anemonefishes)
  - Subfamily Microspathodontinae Jordan & Evermann 1898 (giant damselfishes)
  - Subfamily Chrominae Bonaparte 1831 (chromises)
  - Subfamily Glyphisodontinae Rafinesque 1815 (sergeants majors)
  - Subfamily Pomacentrinae Bonaparte 1831 (anemonefishes or clownfishes)
- Family Embiotocidae Agassiz 1853 (surfperches)
- Family Grammatidae Jordan 1887 (gramma basslets)
- Family Opistognathidae Bonaparte 1835 (jawfishes)
Suborder Gobiesocoidei
- Family Gobiesocidae Bleeker 1859 (clingfishes)
  - Subfamily Diplocrepinae Briggs 1955
  - Subfamily Lepadogastrinae Canestrini 1871-72
  - Subfamily Chorisochisminae Briggs 1955
  - Subfamily Haplocylicinae Briggs 1955
  - Subfamily Protogobiesocinae Fricke, Chen & Chen 2016 (ancestral clingfishes)
  - Subfamily Cheilobranchinae Günther 1870 (shore-eels)
  - Subfamily Trachelochisminae Briggs 1955
  - Subfamily Diademichthyinae Whitley 1950
  - Subfamily Gobiesocinae Bleeker 1859 (New World clingfishes)
Suborder Blennioidei
- Family Tripterygiidae Whitley 1931 (triplefins or threefin blennies)
  - Subfamily Notoclininae Fricke 2009
  - Subfamily Tripterygiinae Whitley 1931
- Family Blenniidae Rafinesque 1810 (combtooth blennies)
  - Subfamily Blenniinae Rafinesque 1810 (blennies)
  - Subfamily Salariinae Gill 1859 (salariin blennies)
- Family Clinidae Swainson 1839 (kelp blennies)
- Family Labrisomidae Clark Hubbs 1952 (labrisomid blennies)
- Family Chaenopsidae Gill 1865 (pikeblennies or tube blennies)
- Family Dactyloscopidae Gill 1859 (sand stargazers)

Order Perciformes
- Suborder Percoidei
  - Family Serranidae Swainson 1839 (sea basses)
  - Family Anthiadidae Poey 1861 (fairy basslets or streamer basses)
  - Family Epinephelidae Bleeker 1874 (groupers)
  - Family Liopropomatidae Poey 1867 (painted basslets)
    - Subfamily Liopropomatinae Poey 1867
    - Subfamily Diploprioninae Bleeker 1874 (barred soapfishes)
  - Family Grammistidae Bleeker 1857 (soapfishes)
  - Family Percidae Rafinesque 1815 (perches and darters)
    - Subfamily Percinae Rafinesque 1815 (freshwater perches)
    - Subfamily Luciopercinae Jordan & Evermann 1896 (pikeperches and Danube perches)
    - Subfamily Etheostomatinae Agassiz 1850 (North American darters)
  - Family Niphonidae Jordan 1923 (Ara groupers)
  - Family Trachinidae Rafinesque 1815 (weeverfishes)
  - Family Bembropidae Regan 1913 (flatheads or duckbill flatheads)
- Suborder Notothenioidei
  - Family Percophidae Swainson 1839 (Brazilian flatheads)
  - Family Bovichtidae Gill 1862 (thornfishes)
  - Family Pseudaphritidae McCulloch 1929 (congollis)
  - Family Eleginopidae Gill 1893 (Patagonian blennies or Falkland Islands blennies)
  - Family Nototheniidae Günther 1861 (cod icefishes)
    - Subfamily Pleuragrammatinae Andersen & Hureau 1979
    - Subfamily Nototheniinae Günther 1861 (notothens)
    - Subfamily Trematominae Balushkin 1982
  - Family Harpagiferidae Gill 1861 (plunderfishes)
    - Subfamily Harpagiferinae Gill 1861 (spiny plunderfishes)
    - Subfamily Artedidraconinae Andriashev 1967 (barbeled plunderfishes)
  - Family Bathydraconidae Regan 1913 (Antarctic dragonfishes)
    - Subfamily Bathydraconinae Regan 1913
    - Subfamily Gymnodraconinae Andriashev 1983
    - Subfamily Cygnodraconinae no valid family-group name description
  - Family Channichthyidae Gill 1861 (crocodile icefishes)
- Suborder Scorpaenoidei
  - Family Platycephalidae Swainson 1839 (flatheads)
  - Family Hoplichthyidae Kaup 1873 (spiny flatheads)
  - Family Triglidae Rafinesque 1815 (searobins)
    - Subfamily Prionotinae Kaup 1873 (spiny searobins)
    - Subfamily Peristediinae Jordan & Gilbert 1883 (armored gurnards)
    - Subfamily Pterygotriglinae Fowler 1938 (spotted gurnards)
    - Subfamily Triglinae Rafinesque 1815 (gurnards)
  - Family Bembridae Kaup 1873 (deepwater flatheads)
  - Family Synanceiidae Swainson 1839 (stonefishes)
    - Subfamily Apistinae Gill 1859 (wasp scorpionfishes)
    - Subfamily Perryeninae Honma, Imamura & Kawai 2013 (whitenose pigfishes)
    - Subfamily Eschmeyerinae Mandrytsa 2001 (cofishes)
    - Subfamily Gnathanacanthinae Gill 1892 (red velvetfishes)
    - Subfamily Aploactininae Jordan & Starks 1904 (velvetfishes)
    - Subfamily Pataecinae Gill 1872 (prowfishes)
    - Subfamily Tetraroginae Smith 1949 (waspfishes)
    - Subfamily Choridactylinae Kaup 1859 (stingers)
    - Subfamily Synanceiinae Swainson 1839 (stonefishes)
  - Family Neosebastidae Matsubara 1943 (gurnard scorpionfishes)
  - Family Plectrogeniidae Fowler 1938 (stinger flatheads)
  - Family Scorpaenidae Risso 1827 (scorpionfishes)
    - Subfamily Scorpaeninae Risso 1827 (scorpionfishes)
    - Subfamily Caracanthinae Gill 1885 (coral crouchers)
    - Subfamily Pteroinae Kaup 1873 (turkeyfishes and lionfishes)
    - Subfamily Setarchinae Matsubara 1943 (deepsea bristly scorpionfishes)
    - Subfamily Sebastolobinae Matsubara 1943 (thornyheads)
    - Subfamily Sebastinae Kaup 1873 (rockfishes)
  - Family Congiopodidae Gill 1889 (racehorses or pigfishes)
  - Family Zanclorhynchidae Andriashev 1993 (horsefishes)
  - Family Normanichthyidae Clark 1937 (barehead scorpionfishes)
- Suborder Cottoidei
  - Family Anoplopomatidae Jordan & Gilbert 1883 (sablefishes)
  - Family Zaniolepididae Jordan & Gilbert 1883 (combfishes)
  - Family Hexagrammidae Jordan 1888 (greenlings)
    - Subfamily Hexagramminae Jordan 1888 (greenlings)
    - Subfamily Pleurogramminae Rutenberg 1954 (Atka mackerels)
    - Subfamily Ophiodontinae Jordan & Gilbert 1883 (lingcods)
    - Subfamily Oxylebiinae Gill 1862 (painted greenlings)
  - Family Rhamphocottidae Jordan & Gilbert 1883 (horsehead sculpins or grunt sculpins)
  - Family Jordaniidae Jordan & Evermann 1898 (longfin sculpins)
  - Family Cottidae Bonaparte 1831 (sculpins)
  - Family Psychrolutidae Günther 1861 (marine sculpins)
  - Family Agonidae Swainson 1839 (poachers)
    - Subfamily Agoninae Swainson 1839 (sturgeon poachers)
    - Subfamily Anoplagoninae Gill 1861 (alligator fishes)
    - Subfamily Bathyagoninae Lindberg 1971 (starsnouts)
    - Subfamily Brachyopsinae Jordan & Evermann 1898 (uppermouth poachers)
    - Subfamily Hypsagoninae Gill 1861 (dragon poachers)
    - Subfamily Bothragoninae Lindberg 1971 (rockheads)
    - Subfamily Hemitripterinae Gill 1865 (sailfin sculpins)
  - Family Trichodontidae Bleeker 1859 (sandfishes)
  - Family Cyclopteridae Bonaparte 1831 (lumpfishes)
    - Subfamily Cyclopterinae Bonaparte 1831 (lumpsuckers)
    - Subfamily Liparopsinae Garman 1892 (smooth lumpsuckers)
    - Subfamily Eumicrotreminae Oku, Imamura & Yabe 2017 (spiny lumpsuckers)
  - Family Liparidae Gill 1861 (snailfishes)
- Suborder Gasterosteoidei
  - Family Hypoptychidae Steindachner 1880 (sand-eels)
  - Family Gasterosteidae Bonaparte 1831 (sticklebacks)
  - Family Aulorhynchidae Gill 1861 (tubesnouts)
- Suborder Zoarcoidei
  - Family Zoarcidae Swainson 1839 (eelpouts)
    - Subfamily Lycodinae Gill 1861
    - Subfamily Lycozoarcinae Andriashev 1939
    - Subfamily Zoarcinae Swainson 1839 (eelpouts)
    - Subfamily Gymnelinae Gill 1863 (pouts)
  - Family Anarhichadidae Bonaparte 1835 (wolffishes)
  - Family Neozoarcidae Jordan & Snyder 1902
  - Family Eulophiidae Smith 1902
  - Family Stichaeidae Gill 1864 (pricklebacks)
    - Subfamily Stichaeinae Gill 1864
    - Subfamily Chirolophinae Jordan & Evermann 1898
    - Subfamily Alectriinae Makushok 1958 (cockscombs)
    - Subfamily Xiphisterinae Jordan 1880
  - Family Lumpenidae Jordan & Evermann 1898 (eel pricklebacks)
  - Family Opisthocentridae Jordan & Evermann 1898
  - Family Pholidae Gill 1893 (gunnels)
    - Subfamily Pholinae Gill 1893 (pigmented gunnels)
    - Subfamily Apodichthyinae Hubbs 1927 (penpoint gunnels)
  - Family Ptilichthyidae Jordan & Gilbert 1883 (quillfishes)
  - Family Zaproridae Jordan 1896 (prowfishes)
  - Family Cryptacanthodidae Gill 1861 (wrymouths)
  - Family Cebidichthyidae Gill 1862 (monkeyface pricklebacks)
  - Family Scytalinidae Jordan & Starks 1895 (graveldivers)
  - Family Bathymasteridae Jordan & Gilbert 1883 (ronquils)

Order Centrarchiformes
- Suborder Percalatoidei
  - Family "Percalates-clade" (Australian basses)
- Suborder Terapontoidei
  - Family Girellidae Gill 1862 (nibblers)
  - Family Scorpididae Günther 1860 (halfmoons)
  - Family Kyphosidae Jordan 1887 (sea chubs)
  - Family Kuhliidae Jordan & Evermann 1896 (flagtails or aholeholes)
  - Family Terapontidae Richardson 1842 (grunters or tigerfishes)
  - Family Dichistiidae Smith 1935 (galjoens)
  - Family Oplegnathidae Bleeker 1853 (knifejaws)
  - Family Caesioscorpididae Parenti & Randall 2020 (blowhole perches)
  - Family Microcanthidae Bleeker 1876 (stripeys)
- Suborder Centrarchoidei
  - Family Centrarchidae Bleeker 1859 (sunfishes and freshwater basses)
    - Subfamily Centrarchinae Bleeker 1859
    - Subfamily Lepominae Gill 1864
  - Family Elassomatidae Jordan 1877 (pygmy sunfishes)
  - Family Sinipercidae Jordan & Richardson 1910 (Chinese perches)
  - Family Enoplosidae Gill 1893 (oldwives)
  - Family Percichthyidae Jordan & Eigenmann 1890 (temperate basses)
  - Family Perciliidae Jordan 1923 (southern basses)
  - Family Parascorpididae Smith 1949 (jutjaws)
- Suborder Cirrhitioidei
  - Family Cirrhitidae Macleay 1841 (hawkfishes)
  - Family Chironemidae Gill 1862 (kelpfishes)
  - Family Aplodactylidae Günther 1859 (marblefishes)
  - Family Cheilodactylidae Bonaparte 1850 (fingerfins)
  - Family Latridae Gill 1862 (trumpeters)

Order Labriformes
- Suborder Labroidei
  - Family Centrogenyidae Fowler 1907 (false scorpionfishes)
  - Family Labridae Cuvier 1816 (wrasses)
  - Family Odacidae Günther 1861 (cales)
- Suborder Uranoscopoidei
  - Family Ammodytidae Bonaparte 1835 (sand lances)
  - Family Uranoscopidae Bonaparte 1831 (stargazers)
  - Family Leptoscopidae Gill 1859 (southern sandfishes)
  - Family Pinguipedidae Günther 1860 (sandperches)
  - Family Cheimarrichthyidae Regan 1913 (New Zealand torrentfishes)

Order Acropomatiformes
- Family Scombropidae Gill 1862 (gnomefishes)
- Family Ostracoberycidae Fowler 1934 (shellskin alfonsinos)
- Family Acropomatidae Gill 1893 (lanternbellies)
- Family Symphysanodontidae Katayama 1984 (slopefishes)
- Family Epigonidae Poey 1861 (deepwater cardinalfishes)
- Family Howellidae Ogilby 1899 (lanternbellies or oceanic basslets)
- Family Polyprionidae Bleeker 1874 (wreckfishes)
- Family Lateolabracidae Ghedotti, Davis and Smith 2018 (Asian seaperches)
- Family Glaucosomatidae Jordan & Thompson 1911 (pearl perches)
- Family Pempheridae Bleeker 1859 (sweepers)
- Family Dinolestidae Whitley 1948 (longfinned pikes)
- Family Stereolepididae Smith, Ghedotti & Davis 2022 (giant sea basses)
- Family Banjosidae Jordan & Thompson 1912 (banjofishes)
- Family Pentacerotidae Bleeker 1859 (armorheads)
  - Subfamily Histiopterinae Bleeker 1876 (sailfin armorheads)
  - Subfamily Pentacerotinae Bleeker 1859
- Family Malakichthyidae Jordan & Richardson 1910 (temperate ocean-basses)
- Family Champsodontidae Jordan & Snyder 1902 (gapers)
- Family Hemerocoetidae Kaup 1873 (Indo-Pacific duckbills)
- Family Creediidae Waite 1899 (sand burrowers)
- Family Synagropidae Smith 1961 (splitfin ocean-basses)
- Family Bathyclupeidae Gill 1896 (deepsea herrings)

Order Acanthuriformes
- Family Gerreidae Bleeker 1859 (mojarras)
- Family Sillaginidae Richardson 1846 (sillagos)
- Family Moronidae Jordan & Evermann 1896 (white basses or temperate basses)
- Family Drepaneidae Gill 1872 (sicklefishes)
- Family Ephippidae Bleeker 1859 (spadefishes and batfishes)
- Family Sciaenidae Cuvier 1829 (croakers and drums)
- Family Dinopercidae Heemstra & Hecht 1986 (cavebasses)
- Family Haemulidae Gill 1885 (grunts)
  - Subfamily Haemulinae Gill 1885
  - Subfamily Plectorhinchinae Jordan & Thompson 1912 (sweetlips)
- Family Lobotidae Gill 1861 (tripletails and tigerperches)
- Family Monodactylidae Jordan & Evermann 1898 (moonies)
- Family Emmelichthyidae Poey 1867 (rovers)
- Family Lutjanidae Gill 1861 (snappers)
  - Subfamily Apsilinae Johnson 1980
  - Subfamily Etelinae Gill 1893 (snappers)
  - Subfamily Paradicichthyinae Whitley 1930 (sailfin snappers)
  - Subfamily Lutjaninae Gill 1861 (snappers & fusiliers)
- Family Malacanthidae Poey 1861 (tilefishes or sand tilefishes)
- Family Latilidae Gill 1862 (deepwater tilefishes)
- Family Pomacanthidae Jordan & Evermann 1898 (angelfishes)
- Family Chaetodontidae Rafinesque 1815 (butterflyfishes)
  - Subfamily Heniochinae Kaup 1860 (bannerfishes)
  - Subfamily Chaetodontinae Rafinesque 1815 (butterflyfishes)
- Family Leiognathidae Gill 1893 (ponyfishes or slipmouths)
  - Subfamily Leiognathinae Gill 1893
  - Subfamily Gazzinae Chakrabarty & Sparks 2015
- Family Luvaridae Gill 1885 (luvars)
- Family Zanclidae Bleeker 1876 (Moorish idols)
- Family Acanthuridae Bonaparte 1835 (surgeonfishes and unicornfishes)
- Family Callanthiidae Ogilby 1899 (splendid perches)
- Family Nemipteridae Regan 1913 (threadfin breams and spinycheeks)
- Family Lethrinidae Bonaparte 1831 (emperor snappers)
  - Subfamily Lethrininae Bonaparte 1831 (emperors)
  - Subfamily Monotaxinae Akazaki 1961 (big-eye seabreams)
- Family Sparidae Rafinesque 1818 (porgys and seabreams)
- Family Siganidae Richardson 1837 (rabbitfishes)
- Family Scatophagidae Gill 1883 (scats)
- Family Cepolidae Rafinesque 1815 (bandfishes)
  - Subfamily Cepolinae Rafinesque 1815
  - Subfamily Owstoniinae Jordan, Tanaka & Snyder 1913
- Family Priacanthidae Günther 1859 (bigeyes)
- Family Caproidae Bonaparte 1835 (boarfishes)
- Family Antigoniidae Jordan & Evermann 1898 (deepwater boarfishes)

Order Lophiiformes
- Suborder Lophioidei
  - Family Lophiidae Rafinesque 1810 (goosefishes or monkfishes)
- Suborder Ogcocephaloidei
  - Family Ogcocephalidae Gill 1893 (batfishes)
- Suborder Antennarioidei
  - Family Rhycheridae Hart, Arnold, Alda, Kenaley, Pietsch, Hutchinson & Chakrabarty 2022 (Balrog frogfishes)
  - Family Brachionichthyidae Gill 1863 (warty anglerfishes)
  - Family Antennariidae Jarocki 1822 (Fibonacci frogfishes)
  - Family Histiophrynidae Arnold & Pietsch 2012 (starfingered frogfishes)
  - Family Tathicarpidae Hart, Arnold, Alda, Kenaley, Pietsch, Hutchinson & Chakrabarty 2022 (longfin frogfishes)
  - Family Tetrabrachiidae Regan 1912 (tetrabrachiid frogfishes)
  - Family Lophichthyidae Boeseman 1964 (lophichthyid frogfishes)
- Suborder Chaunacoidei
  - Family Chaunacidae Gill 1863 (gapers or sea toads)
- Suborder Ceratioidei
  - Family Caulophrynidae Goode & Bean 1896 (fanfins)
  - Family Neoceratiidae Regan 1926 (needlebeard seadevils or spiny seadevils)
  - Family Melanocetidae Gill 1878 (black seadevils)
  - Family Himantolophidae Gill 1861 (footballfishes)
  - Family Diceratiidae Regan & Trewavas 1932 (doublespine seadevils)
  - Family Oneirodidae Gill 1878 (dreamers)
  - Family Thaumatichthyidae Smith & Radcliffe 1912 (wolftrap seadevils)
  - Family Centrophrynidae Bertelsen 1951 (prickly seadevils)
  - Family Ceratiidae Gill 1861 (seadevils)
  - Family Gigantactinidae Boulenger 1904 (whipnose seadevils)
  - Family Linophrynidae Regan 1925 (leftvent seadevils)

Order Tetraodontiformes
- Suborder Triacanthodoidei
  - Family Triacanthodidae Gill 1862 (spikefishes)
  - Family Triacanthidae Bleeker 1859 (triplespines)
- Suborder Tetraodontoidei
  - Family Triodontidae Bleeker 1859 (threetooth puffers)
  - Family Molidae Bonaparte 1832 (molas or ocean sunfishes)
  - Family Diodontidae Billberg 1833 (porcupinefishes and burrfishes)
  - Family Tetraodontidae Bonaparte 1831 (puffers)
- Suborder Balistoidei
  - Family Aracanidae Hollard 1860 (deepwater boxfishes)
  - Family Ostraciidae Rafinesque 1810 (boxfishes)
  - Family Monacanthidae Nardo 1843 (filefishes)
  - Family Balistidae Rafinesque 1810 (triggerfishes)

Class Coelacanthi
- Order Coelacanthiformes
  - Family Latimeriidae Berg 1940 (coelacanths)

Class Dipneusti
- Order Ceratodontiformes
  - Family Neoceratodontidae Schultz 1948 (Australian lungfishes)
  - Family Lepidosirenidae Bonaparte 1841 (South American lungfishes)
  - Family Protopteridae Peters 1855 (African lungfishes)

Eschmeyer's Catalog of Fishes Online Database

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