living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Echinodermata Bruguière, 1789 - echinoderms
           Subphylum Echinozoa von Zittel, 1895 see Infraphylum Echinozoa Haeckel, in Von Zittell, 1895
             Class Echinoidea (Leske, 1778) - sea urchins and sand dollars
               Subclass Perischoechinoidea (M'Coy, 1849)
                 Order Cidaroida Claus, 1880
                   Family Psychocidaridae Ikeda, 1936
                     Genus Psychocidaris Ikeda, 1935
                       Psychocidaris ohshimai Ikeda, 1935