[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 Temnopleuroida (Mortensen, 1942)
         Family Temnopleuridae A. Agassiz, 1872
           1 Genus Genocidaris Agassiz, 1869
           2 Genus Hypsiechinus Mortensen, 1903
           3 Genus Trigonocidaris Agassiz, 1869