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 Polystilifera Brinkmann, 1917
                 Tribe Pelagica Brinkmann, 1917
                   Subtribe Eupelagica
                     Family Planktonemertidae Brinkmann, 1917
                       Genus Planktonemertes Woodworth, 1899
                         1 Planktonemertes agassizii Woodworth, 1899
                         2 Planktonemertes vanhoeffeni Brinkmann, 1915
                         3 Planktonemertes curvicephala Korotkevich, 1964