Phylum Porifera Grant, 1836 - sponges
   Class Demospongiae Sollas, 1885 - demosponges
     01 Class †"Stromatoporoidea" Nicholson & Murie, 1878
     02 Order Homosclerophorida Dendy, 1905
     03 Order Spirophorida Bergquist & Hogg, 1969 see Suborder Spirophorina
     04 Order Astrophorida Sollas, 1888 see Suborder Astrophorina Sollas, 1888
     05 Order Hadromerida Topsent, 1894
     06 Order Chondrosida Boury-Esnault & Lopès, 1985
     07 'Lithistid' Demospongiae Pisera & Lévi, 2002
     07.0 Order Lithistida Schmidt, 1870 - lithistids see Subclass Lithistida Schmidt, 1870
     08 Order Poecilosclerida Topsent, 1928
     09 Order Halichondrida Vosmaer, 1887
     10 Order Agelasida Hartman, 1980
     11 Order Haplosclerida Topsent, 1928
     12 Order Dictyoceratida Minchin, 1900
     13 Order Dendroceratida Minchin, 1900
     14 Order Halisarcida Topsent, 1901 see Order Chondrosida Boury-Esnault & Lopès, 1985
     15 Order Verongida Bergquist, 1978
     16 Order Verticillitida Termier & Termier, 1977 see Order Dictyoceratida Minchin, 1900
     17 Myceliospongia Vacelet & Perez, 1998, incertae sedis
     18 Order †Permosphincta Termier & Termier, 1974
     19 Subclass "Sclerospongiae" Hartman & Goreau, 1970
     20.1 Family †Alpinothalamiidae Senowbari-Daryan, 1990 see Family Celyphiidae de Laubenfels, 1955
     20.2 Family †Ceotinellidae Senowbari-Daryan, 1978
     20.3? Family †Stylothalamiidae Reitner & Engeser, 1985 see Subfamily Verticillitinae Steinmann, 1882
     21 Genus †Polycystothalamia Wu, 1991, incertae sedis