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
                 Family Emplectonematidae Bürger, 1904
                   Genus Nemertopsis Bürger, 1895
                     1 Nemertopsis flavida (Mcintosh, 1873)
                     2 Nemertopsis exilis Coe, 1947
                     3 Nemertopsis bivittata (Delle Chiaje, 1841)
                     4 Nemertopsis gracilis sensu Morton & Morton, 1983