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 Ptychoderidae Spengel, 1893
               Genus Balanoglossus Chiaje, 1829
                 1 Balanoglossus clavigerus DelleChiaje, 1829
                 2 Balanoglossus gigas (Müller, in Spengel, 1893)
                 3 Balanoglossus capensis (Gilchrist, 1908)