living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
Count: -
   Kingdom Animalia Linnaeus, 1758 - animals
  Count: -
     Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
    Count: -
       Subsuperphylum Dexiothetica Jefferies, 1979
      Count: -
         Phylum Chordata Bateson, 1885 - chordates
        Count: -
           Subphylum Craniata auct. see Subphylum Vertebrata Cuvier, 1812
          Count: -
             Vertebrates (Lamarck, 1801) - vertebrates see Subphylum Vertebrata Cuvier, 1812
            Count: -
               Superclass Agnatha Haeckel, 1895 see Class Agnatha Cope, 1889
              Count: -
                 Class Monorhina Haeckel, 1895 see Class Cephalaspidomorphi Moy-Thomas & Mile, 1971
                Count: -
                   Subclass †Galeaspida Halstead, 1982 see Order Galeaspidiformes
                  Count: [†f] †5o;11f [2 May 2017]
                     Order †Polybranchiaspidiformes Liu, 1965 see Order Galeaspidiformes
                    Count: [†f] †4f [2 May 2017]
                       Family †Dayongaspididae Pan, 1985
                      Count: -