Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Echinodermata Bruguière, 1789 - echinoderms
     Subphylum Eleutherozoa Bell, 1891
       Class Echinoidea (Leske, 1778) - sea urchins and sand dollars
         Subclass Euechinoidea Bronn, 1860
           Superorder Echinacea Claus, 1876
             Genus Arbacia Gray, 1835
             Genus Echinometra Meuschen, 1778
             Genus Echinus Linnaeus, 1758
             Genus Heterocentrotus Brandt, 1835
             Genus Paracentrotus Mortensen, 1903
             Genus Salenia Gray, 1835
             Genus Strongylocentrotus Brandt, 1835
             Genus Toxopneustes Agassiz, 1841
             Genus Tripneustes Agassiz, 1841