Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Pisces
       Class Actinopterygii Woodward, 1891 - ray-finned fishes
         Order Siluriformes Rafinesque, 1810 - catfishes
           Family Ageneiosidae - bottlenose catfishes see Family Auchenipteridae Bleeker, 1862
           Family Akysidae Gill, 1861 - stream catfishes
           Family Amblycipitidae Day, 1873 - torrent catfishes
           Family Amphiliidae Regan, 1911 - loach catfishes
           Family †Andinichthyidae Gayet, 1988
           Family Ariidae Bleeker, 1862 - sea catfishes
           Family Aspredinidae Adams, 1854 - banjo catfishes
           Family Astroblepidae Bleeker, 1862 - climbing catfishes
           Family Auchenipteridae Bleeker, 1862 - auchenipterid catfishes
           Family Bagridae Bleeker, 1858 - bagrid catfishes
           Family Callichthyidae Bonaparte, 1838 - callichthyid armored catfishes
           Family Cetopsidae Bleeker, 1858 - whalelike catfishes
           Family Chacidae Bleeker, 1858 - squarehead catfishes
           Family Clariidae Bonaparte, 1846 - airbreathing catfishes
           Family Cranoglanididae Myers, 1931, nom. corr. - armorhead catfishes
           Family Diplomystidae Eigenmann, 1890 - diplomystid catfishes
           Family Doradidae Bleeker, 1858 - thorny catfishes
           Family Helogeneidae - helogeneid catfishes see Subfamily Helogeneinae
           Family Heteropneustidae - airsac catfishes
           Family Hypophthalmidae - loweye catfishes see Family Pimelodidae Bonaparte, 1838
           Family Ictaluridae Gill, 1861 - North American freshwater catfishes
           Family Loricariidae Rafinesque, 1815 - suckermouth armored catfishes
           Family Malapteruridae Bleeker, 1858 - electric catfishes
           Family Mochokidae Jordan, 1923 - squeakers and upside-down catfishes
           Family Olyridae - olyrid catfishes see Family Bagridae Bleeker, 1858
           Family Pangasiidae Bleeker, 1858 - pangasid catfishes
           Family Parakysidae - parakysid catfishes see Subfamily Parakysinae
           Family Pimelodidae Bonaparte, 1838 - long-whiskered catfishes
           Family Plotosidae Bleeker, 1858 - eeltail catfishes
           Family Schilbeidae Bleeker, 1858 - schilbeid catfishes
           Family Scoloplacidae Bailey & Baskin, 1976 - spiny dwarf catfishes
           Family Siluridae Rafinesque, 1815 - sheatfishes
           Family Sisoridae Bleeker, 1858 - sisorid catfishes
           Family Trichomycteridae Bleeker, 1858 - parasitic catfishes and candirus