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 Family Pachastrellidae Carter, 1875 Genus †Helobrachium Schrammen, 1910