organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Superclass Pisces Linnaeus, 1758 - fishes
               1 Class Mixini see Class Myxini (Jaekel, 1911)
               2 Class †Pteraspidomorphi Goodrich, 1909
               3 Class †Pituriaspida Young, 1991 see Order Pituriaspida Young, 1991
               4 Class Cephalaspidomorphi Moy-Thomas & Mile, 1971
               5 Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
               6 Class †Placodermi McCoy, 1848
               7 Class †Acanthodii Owen, 1846
               8 Class Osteichthyes Huxley, 1880 - bony fishes see [unranked] Euteleostomi