living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Osteichthyes Huxley, 1880 - bony fishes see [unranked] Euteleostomi
               Subclass Actinopterygii Woodward, 1891 - ray-finned fishes see Class Actinopterygii Woodward, 1891
                 Order Siluriformes Rafinesque, 1810 - catfishes
                   01 Family Diplomystidae Eigenmann, 1890 - diplomystid catfishes
                   02 Family Ictaluridae Gill, 1861 - North American freshwater catfishes
                   03 Family Bagridae Bleeker, 1858 - bagrid catfishes
                   04 Family Cranoglanididae Myers, 1931, nom. corr. - armorhead catfishes
                   05 Family Siluridae Rafinesque, 1815 - sheatfishes
                   06 Family Schilbidae Bleeker, 1858 see Family Schilbeidae Bleeker, 1858
                   07 Family Pangasiidae Bleeker, 1858 - pangasid catfishes
                   08 Family Amblycipitidae Day, 1873 - torrent catfishes
                   09 Family Amphiliidae Regan, 1911 - loach catfishes
                   10 Family Akysidae Gill, 1861 - stream catfishes
                   11 Family Sisoridae Bleeker, 1858 - sisorid catfishes
                   12 Family Clariidae Bonaparte, 1846 - airbreathing catfishes
                   13 Family Heteropneustidae - airsac catfishes
                   14 Family Chacidae Bleeker, 1858 - squarehead catfishes
                   15 Family Olyridae - olyrid catfishes see Family Bagridae Bleeker, 1858
                   16 Family Malapteruridae Bleeker, 1858 - electric catfishes
                   17 Family Mochokidae Jordan, 1923 - squeakers and upside-down catfishes
                   18 Family Ariidae Bleeker, 1862 - sea catfishes
                   19 Family Doradidae Bleeker, 1858 - thorny catfishes
                   20 Family Auchenipteridae Bleeker, 1862 - auchenipterid catfishes
                   21 Family Aspredinidae Adams, 1854 - banjo catfishes
                   22 Family Plotosidae Bleeker, 1858 - eeltail catfishes
                   23 Family Pimelodidae Bonaparte, 1838 - long-whiskered catfishes
                   24 Family Ageneiosidae - bottlenose catfishes see Family Auchenipteridae Bleeker, 1862
                   25 Family Hypophthalmidae - loweye catfishes see Family Pimelodidae Bonaparte, 1838
                   26 Family Helogenidae see Family Helogeneidae
                   27 Family Cetopsidae Bleeker, 1858 - whalelike catfishes
                   28 Family Trichomycteridae Bleeker, 1858 - parasitic catfishes and candirus
                   29 Family Callichthyidae Bonaparte, 1838 - callichthyid armored catfishes
                   30 Family Loricariidae Rafinesque, 1815 - suckermouth armored catfishes
                   31 Family Astroblepidae Bleeker, 1862 - climbing catfishes