Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Pogonophora Johansson, 1937 - beard worms see Family Siboglinidae Caullery, 1914
     Order Thecanephria A.V. Ivanov, 1955 see Family Siboglinidae Caullery, 1914
       Family Polybrachiidae see Family Siboglinidae Caullery, 1914
         Genus Balathealinum see Genus Galathealinum Kirkegaard, 1956
         Genus Choanophorus Bubko, 1965
         Genus Cyclobrachia
         Genus Diplobrachia
         Genus Heptabrachia Ivanov, 1952
         Genus Polybrachia Ivanov, 1952
         Genus Zenkevitchiana Ivanov, 1957