living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Echinodermata Bruguière, 1789 - echinoderms
           Subphylum Echinozoa von Zittel, 1895 see Infraphylum Echinozoa Haeckel, in Von Zittell, 1895
             Class Echinoidea (Leske, 1778) - sea urchins and sand dollars
               Subclass Euechinoidea Bronn, 1860
                 Superorder Echinacea Claus, 1876
                   Order Echinoida Troschel, 1872
                     Family Echinometridae Gray, 1855
                       1 Genus Echinometra Meuschen, 1778
                       2 Genus Echinostrephus Agassiz, 1863
                       3 Genus Colobocentrotus Brandt, 1834
                       4 Genus Podophora Agassiz, 1840
                       5 Genus Heterocentrotus Brandt, 1835
                       6 Genus Evechinus Verrill, 1871
                       7 Genus Caenocentrotus H.L. Clark, 1912