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 Parazoa (Sollas, 1884) see Phylum Porifera Grant, 1836
         Phylum Porifera Grant, 1836 - sponges
           Class Calcarea Bowerbank, 1864 - calcareous sponges
             Subclass Pharetronidia
               Order Inozoida Rigby & Senowbari-Daryan, 1996
                 Family Petrobionidae Borojevic, 1979
                   Genus Petrobiona Vacelet & Lévi, 1958