[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 Toxopneustidae Troschel, 1872
           1 Genus Sphaerechinus Desor, 1856