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 see Infraphylum Vertebrata Lamarck, 1801
             Superclass Pisces Linnaeus, 1758 - fishes
               1 Class Mixini see Class Myxini Jaekel, 1911
               2 Class †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorpha
               3 Class †Pituriaspida Young, 1991 see Order Pituriaspida Young, 1991
               4 Class Cephalaspidomorphi Kiaer & Stensiö, 1920 see Class Osteostraci Lankester, 1868
               5 Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
               6 Class †Placodermi McCoy, 1848
               7 Class †Acanthodii Owen, 1846 - acanthodians
               8 Class Osteichthyes Huxley, 1880 - bony fishes and tetrapods see Clade Osteichthyes Huxley 1880 [Moore & Near 2020]