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 Asterozoa von Zittel, 1895 see Infraphylum Asterozoa von Zittel, 1895
             Class Stelleroidea Lamarck, 1816 see Subphylum Asterozoa von Zittel, 1895
               Subclass Asteroidea Blainville, 1830 - starfishes see Class Asteroidea Blainville, 1830
                 Order Spinulosida Perrier, 1884
                   Family Pythonasteridae see Family Myxasteridae Perrier, 1885
                     1 Genus Pythonaster Sladen, 1885
                     2 Genus Myxaster Perrier, 1885
                     3 Genus Asthenactis Fisher, 1906