living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Animalia Linnaeus, 1758 - animals
     Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
       Subsuperphylum Dexiothetica Jefferies, 1979
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Craniata auct.
             Vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
               Superclass Agnatha Haeckel, 1895 see Class Agnatha Cope, 1889
                 Class Monorhina Haeckel, 1895 see Class Cephalaspidomorphi Kiaer & Stensiö, 1920
                   Subclass †Galeaspida Halstead, 1982 see Order Galeaspidiformes
                     Order †Polybranchiaspidiformes Liu, 1965
                       1 Family †Dayongaspididae Pan & Zeng, 1985, nom. praeval.
                       2 Family †Hanyangaspididae Pan & Liu, 1975, nom. praeval.
                       3 Family †Xiushuiaspididae Pan & Wang, 1983, nom. praeval.
                       4 Family †Polybranchiaspididae Liu, 1965, nom. praeval.