Phylum Porifera Grant, 1836 - sponges
Period: Proterozoic - Present [2500 Mya - present]; Status: extant
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
  Period: Proterozoic - Present [2500 Mya - present]; Status: extant
     Subclass †Lithistida Schmidt, 1870
    Period: Cambrian - Permian [541 - 252.17 Mya]; Status: fossil
       Order Tetralithistida Lagneau-Hérenger, 1962
      Period: Late Triassic - Present [237 Mya - present]; Status: extant
         Suborder Tetracladina Zittel, 1878
        Period: Late Triassic - Present [237 Mya - present]; Status: extant
           Family Theonellidae Lendenfeld, 1903
          Period: Cretaceous - Present [145 Mya - present]; Status: extant
             Subfamily Theonellinae von Lendenfeld, 1903
            Period: Early Cretaceous - Present [145 Mya - present]; Status: extant
               1 Genus †Colossolacis Schrammen, 1910
              Status: fossil
               2 Genus †Leiophyllum Schrammen, 1924
              Status: fossil
               3 ?Genus †Placoscytus Schrammen, 1910
              Status: fossil
               4 Genus †Rhoptrum Schrammen, 1910
              Status: fossil
               5 Genus †Stellettites Carter, 1871
              Status: fossil
               6 Genus †Racodiscula Zittel, 1878
              Status: fossil
               7 Genus †Discodermia du Bocage, 1869
              Status: fossil
               8 Genus †Theonella Gray, 1869
              Status: fossil