Phylum Porifera Grant, 1836 - sponges
   Subphylum Hexactinellida Schmidt, 1870 see Class Hexactinellida Schmidt, 1870
     Class Amphidiscophora F.E. von Schulze see Subclass Amphidiscophora Schulze, 1886
       Order Amphidiscosida Schrammen, 1924
         Family Pheronematidae Gray, 1870
           Genus Pheronema Leidy, 1868
           Genus Platylistrum F.E. von Schulze, 1904
           Genus Poliopogon Thomson, 1873
           Genus Schulzeviella Tabachnick, 1990
           Genus Semperella Gray, 1868
           Genus Sericolophus Ijima, 1901