Phylum Porifera Grant, 1836 - sponges
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
     Subclass Choristida Sollas, 1880 see Order Tetractinellida Marshall, 1876
       Order Pachastrellida Reid, 2004 see Suborder Astrophorina Sollas, 1888
         1 Family Pachastrellidae Carter, 1875
         2 Family †Costamorphiidae Mostler, 1986 [monotypic]
         3 Family Theneidae Gray, 1872