Phylum Porifera Grant, 1836 - sponges
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
     Subclass Tetractinomorpha Lévi, 1953 see Class Demospongiae Sollas, 1885
       Order †Hadromerida Topsent, 1894
         Family †Polysiphonidae Girty, 1909
           1 ?Genus †Arbusculana Finks & Rigby, 2004
           2 Genus †Polysiphon Girty, 1908
           3 Genus †Zardinia Dieci, Antonacci & Zardini, 1970