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 Nemertea Schultze, 1851 - ribbon worms
           Class Enopla Schultze, 1851
             Order Hoplonemertea Hubrecht, 1879
               Suborder Monostilifera Brinkmann, 1917
                 1 Family Amphiporidae McIntosh, 1874
                 2 Family Carcinonemertidae Sumner, Osburn & Cole, 1913
                 3 Family Cratenemertidae Friedrich, 1968
                 4 Family Emplectonematidae Bürger, 1904
                 5 Family Ototyphlonemertidae Bürger, 1895
                 6 Family Prosorhochmidae Bürger, 1895
                 7 Family Tetrastemmatidae Hubrecht, 1879