[Animalia] Linnaeus, 1758 - animals
   Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Bilateralia
         Echinodermata Bruguière, 1789 - echinoderms
           Echinoidea (Leske, 1778) - sea urchins and sand dollars
             Euechinoidea Bronn, 1860
               Atelostomata von Zittel, 1879 - irregular urchins
                 Spatangoida L. Agassiz, 1840