Kingdom [Animalia] Linnaeus, 1758 - animals Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758 Division Parazoa (Sollas, 1884) see [unranked] Parazoa (Sollas, 1884) Phylum Spongia Class Calcarea Bowerbank, 1864 - calcareous sponges Order Pharetronida Zittel, 1878 see Subclass Pharetronidia Genus [Petrobiona] Vacelet & Lévi, 1958 1 Petrobiona massiliana Vacelet & Lévi, 1958