[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Phylum Porifera Grant, 1836 - sponges
     Class Demospongiae Sollas, 1885 - demosponges
       Subclass Tetractinomorpha Lévi, 1953 see Class Demospongiae Sollas, 1885
         Order Hadromerida Topsent, 1894
           Family Spirastrellidae Ridley & Dendy, 1886
             1 Genus Spirastrella Schmidt, 1868
             2 Genus Spiroxya Topsent, 1896