living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Pogonophora Johansson, 1937 - beard worms see Family Siboglinidae Caullery, 1914
           Class Frenulata 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