[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Echinoderma
         Branch Ambulacrata
           Class Echinoidea (Leske, 1778) - sea urchins and sand dollars
             Grade Autechini
               Branch Desmosticha
                 Order Regularia Latreille, 1825
                   1 Genus Echinus Linnaeus, 1758
                   2 Genus Cidaris Leske, 1778