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
       1 Family Polybrachiidae see Family Siboglinidae Caullery, 1914
       2 Family Sclerolinidae Webb, 1964 see Family Siboglinidae Caullery, 1914
       3 Family Lamellisabellidae Uschakov, 1933 see Family Siboglinidae Caullery, 1914
       4 Family Spirobrachiidae see Family Siboglinidae Caullery, 1914