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 Hemichordata Bateson, 1885 - hemichordates
           Class Enteropneusta Gegenbaur, 1870 - tongue worms
             Family Spengelidae Willey, 1899
               1 Genus Spengelia Willey, 1898
               2 Genus Willeya Punnett, 1903
               3 Genus Schizocardium Spengel, 1893
               4 Genus Glandiceps Spengel, 1891