[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 Ceractinomorpha Lévi, 1953 see Class Demospongiae Sollas, 1885
         Order Haplosclerida Topsent, 1928
           Family Petrosiidae van Soest, 1980
             1 Genus Petrosia Vosmaer, 1887
             2 Genus Xestospongia de Laubenfels, 1932