life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
     Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
       Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
         Nephrozoa Jondelius, Ruiz-Trillo, Baguñà & Riutort 2002
           Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
             Phylum Chordata Bateson, 1885 - chordates
               Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
                 Class "Agnatha" Cope, 1889 [paraphyletic]
                   1 Subclass Myllokunmingiida Shu, 2003
                   2.1 Subclass Cyclostomata Richards
                   2.2.1 Subclass †Conodonta Eichenberg, 1930 see Class Conodonta Eichenberg, 1930
                   2.2.2.1 Subclass †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorphi Goodrich, 1909
                   2.2.2.2.1 Order †Anaspida Traquair - anaspids see Class Anaspida Traquair
                   2.2.2.2.2.1 Order †Thelodonti Jaekel, 1911 see Class Thelodonti Jaekel, 1911
                   2.2.2.2.2.2.1 Subclass †unnamed [paraphyletic] see Class Cephalaspidomorphi Kiaer & Stensiö, 1920