Hopping on the train with this type of thread 
, with the only vertebrate group not yet covered by other threads. As fish taxonomy varies greatly between sources, I will be using the taxonomy used by Eschmeyer's Catalog of Fishes. This is not the most up-to-date taxonomy, but it is more likely to be more familiar to people than the recent Near & Thacker (plus, Eschmeyer has a convenient copyable list available online!) It will be interesting to see how many taxa Zoochat members have seen collectively, especially of rare groups not usually found in aquaria.
, with the only vertebrate group not yet covered by other threads. As fish taxonomy varies greatly between sources, I will be using the taxonomy used by Eschmeyer's Catalog of Fishes. This is not the most up-to-date taxonomy, but it is more likely to be more familiar to people than the recent Near & Thacker (plus, Eschmeyer has a convenient copyable list available online!) It will be interesting to see how many taxa Zoochat members have seen collectively, especially of rare groups not usually found in aquaria.- Class Myxini
- Order Myxiniformes
- Family Myxinidae Rafinesque 1815 (hagfishes)
- Order Myxiniformes
- Class Petromyzonti
- Order Petromyzontiformes
- Family Petromyzontidae Bonaparte 1831 (lampreys)
- Family Geotriidae Gill 1893 (pouched lampreys)
- Family Mordaciidae Gill 1893 (southern topeyed lampreys)
- Order Petromyzontiformes
- 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 Pseudotriakidae Gill 1893 (false catsharks)
- Family Proscylliidae Fowler 1941 (finback catsharks)
- Family Leptochariidae Gray 1851 (barbeled houndsharks)
- Family Triakidae Gray 1851 (houndsharks)
- 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)
- Suborder Scyliorhinoidei
- 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)
- Family Potamotrygonidae Garman 1877 (neotropical 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)
- Order Hexanchiformes
- Class Holocephali
- Order Chimaeriformes
- Family Callorhinchidae Garman 1901 (plownose chimaeras)
- Family Chimaeridae Rafinesque 1815 (shortnose chimaeras or ratfishes)
- Family Rhinochimaeridae Garman 1901 (longnose chimaeras)
- Order Chimaeriformes
- Class Cladistii
- Order Polypteriformes
- Family Polypteridae Bonaparte 1835 (bichirs)
- Order Polypteriformes
- Class Actinopteri
- Order Acipenseriformes
- Family Acipenseridae Bonaparte 1831 (sturgeons)
- Family Polyodontidae Bonaparte 1835 (paddlefishes)
- Order Lepisosteiformes
- Family Lepisosteidae Agassiz 1832 (gars)
- Order Amiiformes
- Family Amiidae Bonaparte 1831 (bowfins)
- Order Elopiformes
- Family Elopidae Valenciennes 1847 (tenpounders and ladyfishes)
- Family Megalopidae Jordan & Gilbert 1883 (tarpons)
- Order Albuliformes
- Family Albulidae Bleeker 1849 (bonefishes)
- Order Notacanthiformes
- Family Halosauridae Günther 1868 (halosaurs)
- Family Notacanthidae Rafinesque 1810 (deepsea spiny eels)
- Order Anguilliformes
- Family Protanguillidae Johnson, Ida & Miya 2011 (primitive cave eels)
- Family Synaphobranchidae Johnson 1862 (cutthroat eels)
- Family Heterenchelyidae Regan 1912 (mud eels)
- Family Myrocongridae Gill 1890 (myroconger eels)
- Family Muraenidae Rafinesque 1815 (moray eels)
- Family Chlopsidae Rafinesque 1815 (false morays)
- Family Colocongridae Smith 1976 (shorttail eels)
- Family Derichthyidae Gill 1884 (longneck eels or narrowneck eels)
- Family Ophichthidae Günther 1870 (snake eels and worm eels)
- Family Muraenesocidae Kaup 1859 (pike conger eels)
- Family Nettastomatidae Kaup 1859 (duckbill eels)
- Family Congridae Kaup 1856 (conger eels)
- Family Moringuidae Gill 1885 (spaghetti eels)
- Family Nemichthyidae Kaup 1859 (snipe eels or threadtail snipe eels)
- Family Serrivomeridae Trewavas 1932 (sawtooth eels)
- Family Anguillidae Rafinesque 1810 (freshwater eels)
- Order Saccopharyngiformes
- 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)
- 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)
- Family Mormyridae Bonaparte 1831 (elephantfishes)
- Family Gymnarchidae Bleeker 1859 (abas)
- 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)
- 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)
- Suborder Denticipitoidei
- 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)
- Suborder Cobitoidei
- Family Botiidae Berg 1940 (pointface 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)
- Family Sundadanionidae Mayden & Chen 2010 (tiny danios)
- Family Danionidae Bleeker 1863 (danionids)
- 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)
- Suborder Gyrinocheiloidei
- Order Characiformes
- Suborder Citharinoidei
- Family Citharinidae Günther 1864 (citharinids)
- Family Distichodontidae Günther 1864 (distichodontids)
- Suborder Characoidei
- Family Crenuchidae Günther 1864 (crenuchids)
- Family Alestidae Cockerell 1910 (African tetras)
- 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)
- 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)
- Family Ctenoluciidae Schultz 1944 (pike characids)
- Family Chalceidae Fowler 1958 (tucanfishes)
- Family Triportheidae Fowler 1940 (hatchet characins)
- Family Gasteropelecidae Bleeker 1859 (freshwater hatchetfishes)
- Family Bryconidae Eigenmann 1912 (bryconids)
- Family Iguanodectidae Eigenmann 1909 (iguanodectids)
- Family Acestrorhynchidae Eigenmann 1912 (freshwater barracudas and biting tetras)
- Family Characidae Latreille 1825 (characins)
- Suborder Citharinoidei
- Order Gymnotiformes
- Family Apteronotidae Jordan 1923 (ghost knifefishes)
- Family Sternopygidae Cope 1871 (glass knifefishes)
- Family Gymnotidae Rafinesque 1815 (gymnotid eels)
- Family Hypopomidae Eigenmann 1912 (bluntnose knifefishes)
- Family Rhamphichthyidae Regan 1911 (painted knifefishes)
- Order Siluriformes
- Suborder Diplomystoidei
- Family Diplomystidae Eigenmann 1890 (diplomystid catfishes)
- Suborder Cetopsoidei
- Family Cetopsidae Bleeker 1858 (cetopsid catfishes)
- Suborder Loricarioidei
- Family Nematogenyidae Bleeker 1862 (mountain catfishes)
- Family Trichomycteridae Bleeker 1858 (pencil catfishes)
- Family Callichthyidae Bonaparte 1835 (callichthyid armored catfishes)
- Family Loricariidae Rafinesque 1815 (suckermouth armored 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)
- Family Amblycipitidae Day 1873 (torrent catfishes)
- Family Sisoridae Bleeker 1858 (sisorid 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)
- Family Auchenipteridae Bleeker 1862 (intromittant catfishes)
- Family Doradidae Bleeker 1858 (thorny catfishes)
- Family Heptapteridae Gill 1861 (seven-finned catfishes)
- Family Phreatobiidae Reichel 1927 (cistern catfishes)
- Family Pimelodidae Bonaparte 1835 (long-whiskered catfishes)
- Family Pseudopimelodidae Fernández-Yépez & Antón 1966 (bumblebee catfishes)
- Family Clariidae Bonaparte 1845 (airbreathing or labyrinth catfishes)
- Family Heteropneustidae Hora 1936 (airsac catfishes)
- Family Ariidae Bleeker 1858 (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)
- Family Malapteruridae Bleeker 1858 (electric catfishes)
- Family Mochokidae Regan 1912 (squeakers and upside-down catfishes)
- Family Auchenoglanididae Jayaram 1966 (flatnose catfishes)
- Family Claroteidae Bleeker 1862 (grunter catfishes)
- Family Schilbeidae Bleeker 1858 (schilbeid catfishes)
- Suborder Diplomystoidei
- Order Lepidogalaxiiformes
- Family Lepidogalaxiidae Rosen 1974 (salamanderfishes)
- Order Argentiniformes
- Family Argentinidae Bonaparte 1846 (argentines)
- Family Microstomatidae Bleeker 1859 (pencilsmelts)
- Family Bathylagidae Gill 1884 (deepsea smelts)
- Family Opisthoproctidae Schmidt 1918 (spookfishes or barreleyes)
- Order Galaxiiformes
- Family Galaxiidae Müller 1845 (galaxiids)
- Order Esociformes
- Family Esocidae Rafinesque 1815 (pikes)
- Family Umbridae Bonaparte 1845 (mudminnows)
- Order Salmoniformes
- Family Salmonidae Jarocki / Schinz 1822 (salmonids)
- Order Osmeriformes
- Family Osmeridae Regan 1913 (smelts)
- Family Plecoglossidae Bleeker 1859 (ayu fishes)
- Family Salangidae Bleeker 1859 (icefishes or noodlefishes)
- Family Retropinnidae Gill 1862 (New Zealand smelts)
- Order Stomiiformes
- Family Gonostomatidae Cocco 1838 (bristlemouths)
- Family Sternoptychidae Duméril 1805 (marine hatchetfishes)
- Family Phosichthyidae Weitzman 1974 (lightfishes)
- Family Stomiidae Bleeker 1859 (dragonfishes or barbeled 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)
- 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)
- 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 Percopsiformes
- Family Percopsidae Agassiz 1850 (trout-perches)
- Family Aphredoderidae Bonaparte 1845 (pirate perches)
- Family Amblyopsidae Bonaparte 1845 (cavefishes)
- Order Zeiformes
- Family Cyttidae Günther 1860 (lookdown dories)
- Family Oreosomatidae Bleeker 1859 (oreos)
- Family Parazenidae McAllister 1968 (smooth dories)
- Family Zeniontidae Myers 1960 (dwarf dories or armoreye dories)
- Family Grammicolepididae Poey 1873 (tinselfishes)
- Family Zeidae Rafinesque 1815 (dories)
- Order Stylephoriformes
- Family Stylephoridae Swainson 1839 (tube-eyes or threadtails)
- Order Gadiformes
- 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)
- Suborder Bregmacerotoidei
- Order Polymixiiformes
- Family Polymixiidae Bleeker 1859 (beardfishes)
- Order Beryciformes
- 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 (hispidoberycids)
- 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)
- Suborder Berycoidei
- Order Trachichthyiformes
- Family Monocentridae Gill 1859 (pinecone fishes)
- Family Trachichthyidae Bleeker 1856 (roughies or slimeheads)
- Family Anomalopidae Gill 1889 (flashlightfishes or lanterneye fishes)
- Family Diretmidae Gill 1893 (spinyfins)
- Family Anoplogastridae Gill 1893 (fangtooths)
- Order Holocentriformes
- Family Holocentridae Bonaparte 1833 (squirrelfishes and soldierfishes)
- Order Ophidiiformes
- Family Ophidiidae Rafinesque 1810 (cusk-eels)
- Family Carapidae Poey 1867 (pearlfishes)
- Family Bythitidae Gill 1861 (viviparous brotulas)
- Family Dinematichthyidae Whitley 1928 (dwarf brotulas)
- Order Batrachoidiformes
- Family Batrachoididae Jordan 1896 (toadfishes)
- 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)
- 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)
- Suborder Stromateoidei
- 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)
- Family Solenostomidae Nardo 1843 (ghost pipefishes)
- Family Syngnathidae Bonaparte 1831 (pipefishes and seahorses)
- Suborder Dactylopteroidei
- Order Kurtiformes
- Family Kurtidae Bleeker 1859 (nurseryfishes)
- Family Apogonidae Günther 1859 (cardinalfishes)
- Family Trichonotidae Günther 1861 (sand divers)
- Order Gobiiformes
- Family Rhyacichthyidae Jordan 1905 (loach gobies)
- Family Odontobutidae Hoese & Gill 1993 (Asian freshwater sleepers)
- Family Eleotridae Bonaparte 1835 (sleepers)
- Family Thalasseleotrididae Gill & Mooi 2012 (ocean sleepers)
- Family Gobiidae Cuvier 1816 (gobies)
- Family Kraemeriidae Whitley 1935 (1911) (sand darts)
- Family Microdesmidae Regan 1912 (wormfishes and dartfishes)
- Family Xenisthmidae Miller 1973 (collared wrigglers)
- Family Schindleriidae Giltay 1934 (infantfishes)
- 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)
- Suborder Mastacembeloidei
- Order Anabantiformes
- Suborder Anabantoidei
- Family Anabantidae Bonaparte 1831 (climbing gouramies)
- Family Helostomatidae Gill 1872 (kissing gouramies)
- Family Osphronemidae van der Hoeven 1832 (gouramies)
- Suborder Channoidei
- Family Aenigmachannidae Britz et al. 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)
- Suborder Anabantoidei
- 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)
- 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)
- 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)
- Family Echeneidae Rafinesque 1810 (remoras and sharksuckers)
- Family Rachycentridae Gill 1896 (cobias)
- Family Coryphaenidae Rafinesque 1815 (dolphinfishes)
- Suborder Centropomoidei
- Order Cichliformes
- Family Ambassidae Klunzinger 1870 (Asiatic glassfishes)
- Family Pseudochromidae Müller & Troschel 1849 (dottybacks)
- Family Grammatidae Jordan 1887 (gramma basslets)
- Family Plesiopidae Günther 1861 (roundheads)
- Family Opistognathidae Bonaparte 1835 (jawfishes)
- Family Polycentridae Gill 1858 (leaffishes)
- Family Cichlidae Bonaparte 1835 (cichlids)
- Family Embiotocidae Agassiz 1853 (surfperches)
- Family Pomacentridae Bonaparte 1831 (damselfishes and anemonefishes)
- Family Pholidichthyidae Jordan 1896 (convict-blennies)
- Order Atheriniformes
- Family Atherinidae Risso 1827 (Old World 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)
- Order Cyprinodontiformes
- Suborder Aplocheiloidei
- Family Aplocheilidae Bleeker 1859 (Old World rivulins)
- Family Nothobranchiidae Garman 1895 (African rivulins)
- Family Rivulidae Myers 1925 (New World rivulins)
- Suborder Cyprinodontoidei
- Family Pantanodontidae Myers 1955 (spine killifishes)
- Family Fundulidae Günther 1866 (topminnows and killifishes)
- Family Cyprinodontidae Wagner 1828 (killifishes)
- Family Profundulidae Hoedeman & Bronner 1951 (Middle American killifishes)
- Family Goodeidae Jordan & Gilbert 1883 (splitfins)
- Family Fluviphylacidae Roberts 1970 (American lampeyes)
- Family Poeciliidae Bonaparte 1831 (poeciliids)
- Family Anablepidae Bonaparte 1831 (four-eyed fishes and onesided livebearers)
- Family Aphaniidae Hoedeman 1949 (Oriental killifishes)
- Family Valenciidae Parenti 1981 (European killifishes)
- Family Procatopodidae Fowler 1916 (African lampeyes)
- Suborder Aplocheiloidei
- 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)
- Order Mugiliformes
- Family Mugilidae Jarocki 1822 (mullets)
- Order Gobiesociformes
- Family Gobiesocidae Bleeker 1859 (clingfishes)
- Order Blenniiformes
- Family Tripterygiidae Whitley 1931 (triplefins or threefin blennies)
- Family Labrisomidae Clark Hubbs 1952 (labrisomid blennies)
- Family Clinidae Swainson 1839 (kelp blennies)
- Family Chaenopsidae Gill 1865 (pikeblennies or tube blennies)
- Family Dactyloscopidae Gill 1859 (sand stargazers)
- Family Blenniidae Rafinesque 1810 (combtooth blennies)
- Order Perciformes *sedis mutabilis*
- Family Caesioscorpididae Parenti & Randall 2020 (blowhole perches)
- Family Leptoscopidae Gill 1859 (southern sandfishes)
- 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)
- Family Grammistidae Bleeker 1857 (soapfishes)
- Family Percidae Rafinesque 1815 (perches and darters)
- Family Niphonidae Jordan 1923 (Ara groupers)
- Suborder Labroidei
- Family Centrogenyidae Fowler 1907 (false scorpionfishes)
- Family Labridae Cuvier 1816 (wrasses)
- Family Odacidae Günther 1861 (cales)
- Suborder Zoarcoidei
- Family Zoarcidae Swainson 1839 (eelpouts)
- Family Anarhichadidae Bonaparte 1835 (wolffishes)
- Family Neozoarcidae Jordan & Snyder 1902
- Family Eulophiidae Smith 1902
- Family Stichaeidae Gill 1864 (pricklebacks)
- Family Lumpenidae Jordan & Evermann 1898 (eel pricklebacks)
- Family Opisthocentridae Jordan & Evermann 1898
- Family Pholidae Gill 1893 (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)
- 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)
- Family Harpagiferidae Gill 1861 (plunderfishes)
- Family Bathydraconidae Regan 1913 (Antarctic dragonfishes)
- Family Channichthyidae Gill 1861 (crocodile icefishes)
- Suborder Trachinoidei
- Family Trichodontidae Bleeker 1859 (sandfishes)
- Family Ammodytidae Bonaparte 1835 (sand lances)
- Family Trachinidae Rafinesque 1815 (weeverfishes)
- Family Uranoscopidae Bonaparte 1831 (stargazers)
- Family Pinguipedidae Günther 1860 (sandperches)
- Family Cheimarrichthyidae Regan 1913 (New Zealand torrentfishes)
- Suborder Bembropoidei
- Family Bembropidae Regan 1913 (flatheads or duckbill flatheads)
- Suborder Scorpaenoidei
- Family Platycephalidae Swainson 1839 (flatheads)
- Family Hoplichthyidae Kaup 1873 (spiny flatheads)
- Family Triglidae Rafinesque 1815 (searobins)
- Family Bembridae Kaup 1873 (deepwater flatheads)
- Family Synanceiidae Swainson 1839 (stonefishes)
- Family Neosebastidae Matsubara 1943 (gurnard scorpionfishes)
- Family Plectrogeniidae Fowler 1938 (stinger flatheads)
- Family Scorpaenidae Risso 1827 (scorpionfishes)
- Family Congiopodidae Gill 1889 (racehorses or pigfishes)
- Family Zanclorhynchidae Andriashev 1993 (horsefishes)
- Family Normanichthyidae Clark 1937 (barehead scorpionfishes)
- Suborder Gasterosteoidei
- Family Hypoptychidae Steindachner 1880 (sand-eels)
- Family Gasterosteidae Bonaparte 1831 (sticklebacks)
- Family Aulorhynchidae Gill 1861 (tubesnouts)
- Suborder Cottoidei
- Family Anoplopomatidae Jordan & Gilbert 1883 (sablefishes)
- Family Zaniolepididae Jordan & Gilbert 1883 (combfishes)
- Family Hexagrammidae Jordan 1888 (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)
- Family Cyclopteridae Bonaparte 1831 (lumpfishes)
- Family Liparidae Gill 1861 (snailfishes)
- Suborder Percoidei
- Order Centrarchiformes
- Suborder Percichthyoidei
- Family Percichthyidae Jordan & Eigenmann 1890 (temperate basses)
- Family Perciliidae Jordan 1923 (southern basses)
- Suborder Terapontoidei
- Family Terapontidae Richardson 1842 (grunters or tigerfishes)
- Family Kuhliidae Jordan & Evermann 1896 (flagtails or aholeholes)
- Family Dichistiidae Smith 1935 (galjoens)
- Family Oplegnathidae Bleeker 1853 (knifejaws)
- Family Kyphosidae Jordan 1887 (sea chubs)
- Family Girellidae Gill 1862 (nibblers)
- Family Scorpididae Günther 1860 (halfmoons)
- Family Microcanthidae Bleeker 1876 (stripeys)
- Family Parascorpididae Smith 1949 (jutjaws)
- Suborder Centrarchoidei
- Family Centrarchidae Bleeker 1859 (sunfishes and freshwater basses)
- Family Elassomatidae Jordan 1877 (pygmy sunfishes)
- Family Enoplosidae Gill 1893 (oldwives)
- Family Sinipercidae Jordan & Richardson 1910 (Chinese perches)
- 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)
- Suborder Percalatoidei
- Family "Percalates-clade" (Australian basses)
- Suborder Percichthyoidei
- 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 Banjosidae Jordan & Thompson 1912 (banjofishes)
- Family Pentacerotidae Bleeker 1859 (armorheads)
- 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 Stereolepididae Smith, Ghedotti & Davis 2022 (giant sea basses)
- Family Synagropidae Smith 1961 (splitfin ocean-basses)
- Family Bathyclupeidae Gill 1896 (deepsea herrings)
- Order Acanthuriformes
- Family Moronidae Jordan & Evermann 1896 (white basses or temperate basses)
- Family Dinopercidae Heemstra & Hecht 1986 (cavebasses)
- Family Callanthiidae Ogilby 1899 (splendid perches)
- Family Priacanthidae Günther 1859 (bigeyes)
- Family Sillaginidae Richardson 1846 (sillagos)
- Family Malacanthidae Poey 1861 (tilefishes or sand tilefishes)
- Family Latilidae Gill 1862 (deepwater tilefishes)
- Family Emmelichthyidae Poey 1867 (rovers)
- Family Lutjanidae Gill 1861 (snappers)
- Family Gerreidae Bleeker 1859 (mojarras)
- Family Haemulidae Gill 1885 (grunts)
- Family Sparidae Rafinesque 1818 (porgys and seabreams)
- Family Lethrinidae Bonaparte 1831 (emperor snappers)
- Family Nemipteridae Regan 1913 (threadfin breams and spinycheeks)
- Family Sciaenidae Cuvier 1829 (croakers and drums)
- Family Monodactylidae Jordan & Evermann 1898 (moonies)
- Family Cepolidae Rafinesque 1815 (bandfishes)
- Family Lobotidae Gill 1861 (tripletails and tigerperches)
- Family Pomacanthidae Jordan & Evermann 1898 (angelfishes)
- Family Drepaneidae Gill 1872 (sicklefishes)
- Family Chaetodontidae Rafinesque 1815 (butterflyfishes)
- Family Ephippidae Bleeker 1859 (spadefishes and batfishes)
- Family Leiognathidae Gill 1893 (ponyfishes or slipmouths)
- Family Scatophagidae Gill 1883 (scats)
- Family Antigoniidae Jordan & Evermann 1898 (deepwater boarfishes)
- Family Siganidae Richardson 1837 (rabbitfishes)
- Family Caproidae Bonaparte 1835 (boarfishes)
- Family Luvaridae Gill 1885 (luvars)
- Family Zanclidae Bleeker 1876 (Moorish idols)
- Family Acanthuridae Bonaparte 1835 (surgeonfishes and unicornfishes)
- Order Lophiiformes
- Suborder Lophioidei
- Family Lophiidae Rafinesque 1810 (goosefishes or monkfishes)
- Suborder Ogcocephaloidei
- Family Ogcocephalidae Gill 1893 (batfishes)
- Suborder Antennarioidei
- Family Rhycheridae Hart et al. 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 et al. 2022 (longfin frogfishes)
- Family Tetrabrachiidae Regan 1912 (tetrabrachiid frogfishes)
- Family Lophichthyidae Boeseman 1964 (lophichthyid frogfishes)
- Suborder Chaunacioidei
- 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)
- Suborder Lophioidei
- 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)
- Suborder Triacanthodoidei
- Order Acipenseriformes
- Class Coelacanthi
- Order Coelacanthiformes
- Family Latimeriidae Berg 1940 (coelacanths)
- Order Coelacanthiformes
- Class Dipneusti
- Order Ceratodontiformes
- Family Neoceratodontidae Schultz 1948 (Australian lungfishes)
- Family Lepidosirenidae Bonaparte 1841 (South American lungfishes)
- Family Protopteridae Peters 1855 (African lungfishes)
- Order Ceratodontiformes
