[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Phylum Echinodermata Bruguière, 1789 - echinoderms
     Class Echinoidea (Leske, 1778) - sea urchins and sand dollars
       Order Cidaroida Claus, 1880
         Family Cidaridae Gray, 1825
           1 Genus Cidaris Leske, 1778
           2 Genus Poriocidaris Mortensen, 1909
           3 Genus Stereocidaris Pomel, 1883
           4 Genus Stylocidaris Mortensen, 1909