living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
Status: extant
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
  Status: extant
     Kingdom Animalia Linnaeus, 1758 - animals
    Status: extant
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
      Status: extant
         Phylum Echinodermata Bruguière, 1789 - echinoderms
        Status: extant
           Subphylum Echinozoa von Zittel, 1895 see Infraphylum Echinozoa Haeckel, in Von Zittell, 1895
          Status: extant
             Class Echinoidea (Leske, 1778) - sea urchins and sand dollars
            Status: extant
               Subclass Euechinoidea Bronn, 1860
              Status: extant
                 Superorder Gnathostomata Zittel, 1879
                Status: extant
                   1 Order Holectypoida Ducan, 1889
                  Status: extant
                   2 Order Clypeasteroida A. Agassiz, 1872 - true sand dollars
                  Status: extant